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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Применить Всего найдено 1287. Отображено 103.
22-06-2010 дата публикации

SYSTEM FOR SYNCHRONOUS SAMPLING AND TIME-OF-DAY CLOCKING USING AN ENCODED TIME SIGNAL

Номер: CA0002536310C
Автор: ZWEIGLE, GREGORY C., WHITEHEAD, DAVID E., CASEBOLT, DAVID J.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES

The system for synchronous sampling uses an encoded time signal, such as an IRIG-B signal. The IRIG-B signal is applied to an edge detector, which produces pulses based on the edges of the encoded time signal. These signals are applied to a phase-locked-loop assembly which is arranged to produce an output sampling synchronization signal which is locked to the transitions in the encoded time signal, providing a synchronous control signal for data sampling of input signals to a plurality of electronic instruments, in addition to the use of the IRIG-B signal as time-of-day clock synchronization for the plurality of instruments.

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Номер записи: 1
01-06-2004 дата публикации

System for sampling a signal in an electronic instrument using a unipolar A/D converter

Номер: US0006744391B2
Автор: Travis L. Mooney, Tony J. Lee, Bruce A. Hall, MOONEY TRAVIS L, LEE TONY J, HALL BRUCE A, MOONEY TRAVIS L., LEE TONY J., HALL BRUCE A.
Принадлежит: Schweitzer Engineering Laboratories, SCHWEITZER ENGINEERING LAB, SCHWEITZER ENGINEERING LABORATORIES

The system includes a unipolar A/D converter, which samples analog signal inputs thereto, the A/D converter being used in a protective relay for electric power systems. The unipolar A/D converter is responsive to input voltage values and current values from the power line to produce corresponding digital signals. The A/D converter has a ground pin voltage reference at least as negative as the most negative point of the input signal to be processed.

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Номер записи: 2
25-02-2003 дата публикации

Fault type selection system for identifying faults in an electric power system

Номер: US0006525543B1
Автор: Jeffrey B. Roberts, Demetrios Tziouvaras, ROBERTS JEFFREY B, TZIOUVARAS DEMETRIOS, ROBERTS JEFFREY B.
Принадлежит: Schweitzer Engineering Laboratories, SCHWEITZER ENGINEERING LAB, SCHWEITZER ENGINEERING LABORATORIES

The fault identification system includes a first logic circuit which is responsive to conventional protective elements which recognize the presence of low resistance single line-to-ground faults for the A, B and C phases on a power transmission line. The first logic circuit includes a portion thereof for recognizing and providing an output indication of single line-to-ground faults, faults involving two phases and three-phase faults, in response to the occurrence of different combinations of outputs from the protective elements. A calculation circuit, when enabled, is used to determine the angular difference between the total zero sequence current and the total negative sequence current for high resistance faults when the protective elements themselves cannot identify fault conditions. The angular difference is in one of three pre-selected angular sectors. An angular difference in the first sector indicates an A phase-to-ground fault or a BC phase-to-phase to ground fault; an angular difference ...

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Номер записи: 3
18-10-2012 дата публикации

POPPET VALVE ASSEMBLY FOR CONTROLLING A PNEUMATIC ACTUATOR

Номер: US20120260993A1
Автор: Penning Bruce R.
Принадлежит: General Equipment and Manufacturing Company, Inc., d/b/a TopWorx, Inc.

A poppet valve assembly to control a pneumatic actuator may include a housing having a central bore. A first module may be disposed within the central bore, and the first module may have a first and second poppet valve. A second module may also be disposed within the central bore, and the second module may have a third and fourth poppet valve. A supply of pressurized fluid may be in fluid communication with a plurality of control valves such that pressurized fluid from the control valves opens and closes the poppet valves. The supply of pressurized fluid may also be in fluid communication with the first module and the second module such that the opening and closing of the poppet valves controls the position of the pneumatic actuator. 1. A poppet valve assembly comprising:a valve housing having a central bore;a first module disposed within the central bore, the first module comprising a first normally closed poppet valve and a second normally closed poppet valve, wherein each of the first and second normally closed poppet valves has an open position and a closed position;a central port formed in the first module, wherein the central port of the first module is adapted to be coupled to a first volume of a pneumatic cylinder;an exhaust port formed in the first module such that the central port is in fluid communication with the exhaust port when the first poppet valve is in the open position; anda supply port formed in the first module such that the central port is in fluid communication with the supply port when second poppet valve is in the open position,wherein the supply port is configured to be in fluid communication with a supply of pressurized fluid such that when the second poppet valve is in the open position, pressurized fluid is provided to the first volume of the pneumatic cylinder, andwherein the exhaust port is configured to vent pressurized fluid from the first volume of the pneumatic cylinder when the first poppet valve is in the open position.2. The ...

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Номер записи: 4
13-12-2012 дата публикации

Electro-Optical Radiation Collector for Arc Flash Detection

Номер: US20120312971A1
Автор: Kesler James R., Scheer Gary W., Trout Douglas M.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

An electro-optical (EO) radiation collector for collecting and/or transmitting EO radiation (which may include EO radiation in the visible wavelengths) for transmission to an EO sensor. The EO radiation collector may be used with an arc flash detection device or other protective system, such as an intelligent electronic device (IED). The arc flash detection device may detect an arc flash event based upon EO radiation collected by and/or transmitted from the EO radiation collector. The EO radiation collector may receive an EO conductor cable, an end of which may be configured to receive EO radiation. A portion of the EO radiation received by the EO radiation collector may be transmitted into the EO conductor cable and transmitted to the arc flash detection device. The EO radiation collector may be adapted to receive a second EO conductor cable, which may be used to provide redundant EO transmission and/or self-test capabilities. 128-. (canceled)29. An apparatus , comprising: an inner surface of the EO collector configured to define an EO receiving area of the EO collector;', 'a first EO conductor configured to emit EO radiation into the EO receiving area of the EO collector, and', 'a second EO conductor configured to receive EO radiation within the EO receiving area,', 'wherein the inner surface of the EO collector is configured to transmit EO radiation emitted by the first EO conductor to the second EO conductor., 'an electro-optical (EO) collector, comprising;'}30. The apparatus of claim 29 , wherein an end of the first EO conductor is secured within the EO receiving area of the EO collector.31. The apparatus of claim 29 , wherein an end of the second EO conductor is secured within the EO receiving area of the EO collector.32. The apparatus of claim 31 , wherein the end of the second EO conductor secured within the EO receiving area is configured to receive EO radiation within the receiving area of the EO collector.33. The apparatus of claim 31 , wherein the end of ...

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Номер записи: 5
13-12-2012 дата публикации

Arc Flash Protection System with Self-Test

Номер: US20120312977A1
Автор: Das Dhruba P., III Edmund O., Kesler James R., Scheer Gary W., Schweitzer, Skendzic Veselin, Trout Douglas M.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

An method for automatically testing an arc flash detection system by periodically or continually transmitting electro-optical (EO) radiation through one or more transmission cables electro-optically coupled to respective EO radiation collectors. A test EO signal may pass through the EO radiation collector to be received by an EO sensor. An attenuation of the EO signal may be determined by comparing the intensity of the transmitted EO signal to an intensity of the received EO signal. A self-test failure may be detected if the attenuation exceeds a threshold. EO signals may be transmitted according to a particular pattern (e.g., a coded signal) to allow an arc flash detection system to distinguish the test EO radiation from EO radiation indicative of an arc flash event. 129-. (canceled)30. An electro-optical radiation collector , comprising:an electro-optical (EO) receiving area;a first EO conductor having an end secured within the EO radiation receiving area;a second EO conductor having an end secured within the EO radiation receiving area;wherein the EO radiation collector is configured to direct test EO radiation into the EO receiving area for collection by one or more of the first EO conductor and the second EO conductor, and wherein an arc flash detection device determines a result of a self-test operation based upon EO radiation collected by one or more of the first EO conductor and the second EO conductor in response to the test EO radiation.311. The electro-optical radiation collector of claim , wherein the first EO conductor is configured to emit test EO radiation , and the second EO conductor is configured to collect at least a portion of test EO radiation emitted from the first EO conductor.32. The electro-optical radiation collector of claim 31 , further comprising an inner surface configured to direct at least a portion of the test EO radiation emitted from the first EO conductor into the EO receiving area.33. The electro-optical radiation collector of ...

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Номер записи: 6
13-12-2012 дата публикации

Power Angle Monitor

Номер: US20120313490A1
Автор:
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

A system and method for monitoring the rotation of a generator rotor. The monitor uses a light beam directed toward the rotor to detect a marking thereon, and generates an electrical pulse when the marking is detected. The time between the pulse and a reference point (such as a zero crossing) of the signal waveform from the terminals of the generator may be used to calculate the power angle of the generator. The system is adaptive in that it can account for new markings on the rotor. The system may be connected to a network so that power angles from various generators on the electrical network may be compared. The system may further be connected to a common time source such that a time stamp may be applied to the power angles from various generators, allowing for more accurate comparison of the power angles. 1. A system for monitoring the angular displacement of a rotor of an electrical power generator , comprising: a rotor including a marking, and', 'terminals in electrical communication with the generator, to provide a signal waveform from the generator;, 'an electric power generator comprising'}a light source to direct a beam of light toward the rotor;an optical sensor adapted to detect reflections of the beam of light from the rotor; and,a controller in electrical communication with the terminals and the optical sensor to generate a marking profile including a record of a signal from the detected reflections of the beam of light, and to generate a rotor pulse when the optical sensor detects a reflection corresponding with the marking.2. The system of claim 1 , wherein the controller comprises a time input and is adapted to determine a period of rotation of the rotor using the time input and the rotor pulse.3. The system of claim 1 , wherein the controller comprises a time input and is adapted to record a first time between the rotor pulse and a reference point on the signal waveform received from the terminals.4. The system of claim 3 , wherein the reference ...

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Номер записи: 7
20-12-2012 дата публикации

Electric Power System Automation Using Time Coordinated Instructions

Номер: US20120323397A1
Автор: Fischer Normann, III Edmund O., Morris Robert E., Schweitzer, Whitehead David E., Zweigle Gregary C.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

A system for controlling and automating an electric power delivery system by executing time coordinated instruction sets to achieve a desired result. A communication master may implement the execution of time coordinated instruction sets in a variety of circumstances. The communication may be embodied as an automation controller in communication with intelligent electronic devices (IEDs). The communication master may also be embodied as an IED that is configured to coordinate the actions of other IEDs. The time coordinated instruction sets may include steps for checking status of power system equipment before executing. The time coordinated instruction sets may include reactionary steps to execute if one of the steps fails. The time coordinated instruction sets may also be implemented based on a condition detected in the electric power delivery system, or may be implemented through high level systems, such as a SCADA system or a wide area control and situational awareness system. 127-. (canceled)28. A communication master for controlling an electric power delivery system , comprising:a processor;a communications interface to communicate with a plurality of intelligent electronic devices (IEDs) via an electronic network; establish an execution time at which the plurality of IEDs are to begin to execute a time coordinated instruction set comprising at least one execution action for execution by at least one of the plurality of IEDs in communication with monitored equipment; and', 'transmit the execution time to the plurality of IEDs via the communications interface., 'instructions executable on the processor that enable the communication master to, 'a non-transitory computer-readable storage medium comprising29. The communication master of claim 28 , wherein the non-transitory computer-readable storage medium further comprises a database comprising a plurality of time coordinated instruction sets.30. The communication master of claim 29 , wherein the instructions ...

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Номер записи: 8
27-12-2012 дата публикации

Systems and Methods for Managing Secure Communication Sessions with Remote Devices

Номер: US20120331534A1
Автор: Christopher Ewing, Kimberly Ann Yauchzee, Nathan Paul Kipp, Rhett Smith, Ryan Bradetich
Принадлежит: Schweitzer Engineering Laboratories Inc

According to various embodiments, a session manager generates, stores, and periodically updates the login credentials for each of a plurality of connected IEDs. An operator, possibly via an access device, may provide unique login credentials to the session manager. The session manager may determine the authorization level of the operator based on the operator's login credentials, defining with which IEDs the operator may communicate. According to various embodiments, the session manager does not facilitate a communication session between the operator and a target IED. Rather, the session manager maintains a first communication session with the operator and initiates a second communication session with the target IED. Accordingly, the session manager may forward commands transmitted by the operator to the target IED. Based on the authorization level of the operator, a session filter may restrict what may be communicated between an operator and an IED.

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Номер записи: 9
03-01-2013 дата публикации

VALVE SIGNATURE DIAGNOSIS AND LEAK TEST DEVICE

Номер: US20130000753A1
Автор: LaFountain Robert L., Li Jingli, Penning Bruce R., Rigsby Bruce
Принадлежит: General Equipment and Manufacturing Company, Inc., d/b/a TopWorx, Inc.

A valve signature diagnosis and leak testing device includes a spool valve operatively connected to a pilot valve, the pilot valve being configured to position the spool valve to one of an open position and a closed position. A blocker valve is fluidly connected to a control fluid outlet of the spool valve. An electrical module is operatively connected to the pilot valve, a supply of control fluid, and the blocker valve, the electrical module being capable of sending pulsed electrical signals to the pilot valve and the blocker valve to selectively position the spool valve and the blocker valve to an open or closed position. 1. A valve signature diagnosis and leak testing device for a control valve , the valve signature diagnosis and leak testing device comprising:a spool valve operatively connected to a pilot valve, the pilot valve being configured to position the spool valve to one of an open position and a closed position, the spool valve including a first control fluid inlet, a first control fluid outlet, and a second control fluid outlet, the first control fluid inlet being fluidly connected to a supply of control fluid and the first control fluid outlet being configured to be connected to a valve actuator;a blocker valve fluidly connected to the second control fluid outlet; andan electrical module operatively connected to the pilot valve, the supply of control fluid, and the blocker valve, the electrical module being capable of sending pulsed electrical signals to the pilot valve and the blocker valve to selectively position the spool valve and the blocker valve to an open or a closed position,wherein the open position of the spool valve fluidly connects the first control fluid inlet to the first control fluid outlet and the closed position of the spool valve fluidly connects the first control fluid outlet to the second control fluid outlet.2. The valve signature diagnosis and leak testing device of claim 1 , wherein the electrical module includes a main ...

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Номер записи: 10
17-01-2013 дата публикации

Systems and Methods for Blackout Protection

Номер: US20130018521A1
Автор: Manson Scott M.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

A system for managing an electric power delivery system is disclosed that includes a set of remote intelligent electronic devices (IEDs) and a central IED. The remote IEDs may be configured to obtain information related to rotor angles, operating frequencies, rate of change of frequency, rotating inertia, and power consumption levels of loads and generators included in the electric power delivery system. The central IED may communicate with the remote IEDs to determine which loads and generators are associated with a sub-grid of the electric power delivery system and whether to disconnected certain loads or generators. Based on this determination, the central IED may direct the remote IEDs to disconnect loads or generators from the electric power delivery system, or to rapidly increase or decrease generator output as appropriate. 1. A system for managing an electric power delivery system comprising:a first plurality of intelligent electronic devices (IEDs), each IED of the first plurality of IEDs being communicatively coupled with a load, wherein each IED of the first plurality of IEDs is configured to obtain load information from the loads, and wherein each IED of the first plurality of IEDs is configured to selectively disconnect a load from the electric power delivery system;a second plurality of IEDs, each IED of the second plurality of IEDs being communicatively coupled with a respective generator, wherein each IED of the second plurality of IEDs is configured to obtain generator information from the corresponding generator, and wherein each IED of the second plurality of IEDs is configured to selectively modify load or generation on the electric power delivery system; and receive the load and generator information;', 'based on the load and generator information, determine an amount of generation or load to be modified; and,', 'signal appropriate IEDs of the first and second plurality of IEDs to modify associated generation or load;, 'a central IED ...

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Номер записи: 11
24-01-2013 дата публикации

WIRELESS MONITORING AND CONTROL OF SAFETY STATIONS IN A PROCESS PLANT

Номер: US20130021167A1
Автор: Harper, JR. Ronald D.
Принадлежит: General Equipment and Manufacturing Company, Inc., d/b/a TopWorx, Inc.

A safety station for use in a process plant includes one or more leverless limit switches to detect activation of one or more parts of the safety station. The safety station further includes a wireless transmitter coupled to the leverless limit switches to transmit signals associated with the safety station to a base station device, which is communicatively coupled to one or more control and/or monitoring devices. 1. A safety station for use in a process plant , the safety station comprising:one or more leverless limit switches to detect activation of one or more parts of the safety station; anda wireless transmitter coupled to the leverless limit switches to transmit signals associated with the safety station to a base station device, wherein the base station device is communicatively coupled to one or more control and/or monitoring modules.2. The safety station of claim 1 , wherein the leverless limit switch is a GO® switch manufactured by the TopWorx corporation.3. The safety station of claim 1 , wherein the leverless limit switch remains latched until physically reset.4702. The safety station of claim 1 , wherein the wireless transmitter is the Rosemount dual input transmitter manufactured by the Emerson corporation.5. The safety station of claim 1 , wherein the wireless transmitter is an intrinsically safe wireless transmitter.6. The safety station of claim 1 , wherein the safety station is a safety shower and/or an eye wash station.7. The safety station of claim 1 , wherein at least one of the one or more control and/or monitoring stations is a remote touch screen panel.8. The safety station of claim 1 , wherein at least one of the one or more control and/or monitoring stations is a paperless recorder.9. The safety station of claim 1 , wherein at least one of the one or more control and/or monitoring stations is a workstation.10. A safety station monitoring and control system in a process plant claim 1 , the system comprising:one or more safety stations ...

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Номер записи: 12
31-01-2013 дата публикации

SWITCH MODULE

Номер: US20130027831A1
Автор: Penning Bruce R.
Принадлежит: General Equipment and Manufacturing Company, Inc., d/b/a TopWorx, Inc.

A switch module used for position sensing may be operated in a number of modes for compatibility with a number of legacy position sensing products. A dry switch circuit can be configured to provide a direct output, emulating dry reed, high-side or low-side switched configurations. Alternatively, the dry switch circuit can be connected to an input of a NAMUR circuit to provide the known current output for that standard. In another configuration the dry switch can be selectively coupled to one of two NAMUR circuits allowing the switch module to provide a low-to-high current NAMUR output or a high-to-low current NAMUR output. 1. A switch module arranged and adapted to report a position of a moveable element external to the switch module , the switch module comprising:a first external connection, a second external connection, and a third external connection;a dry contact relay having a relay contact position responsive to a position of a component external to the switch module, the dry contact relay having a common connection, a normally open connection and a normally closed connection, where the normally open connection corresponds to a first position of the moveable element and the normally closed connection corresponding to a second position of the moveable;a NAMUR circuit having a first input connection pair and a first output connection pair;an electrical connection from the normally open connection of the dry relay to a first input of the first input connection pair of the NAMUR circuit;a selector operable to connect the common connection of the dry contact relay to i) a null contact of the selector or ii) a second input of the first input connection pair of the NAMUR circuit;a second electrical connection from the first output of the NAMUR circuit to one of the first external connection or the second external connection; anda third electrical connection between the second output of the NAMUR circuit to the third external connection;a first jumper that removeably ...

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Номер записи: 13
11-04-2013 дата публикации

Asset Condition Monitoring in an Electric Motor

Номер: US20130088799A1
Автор: Mark L. Zeller
Принадлежит: Schweitzer Engineering Laboratories Inc

The motor monitoring system of the present disclosure uses several calculated monitoring values to determine a status of a motor and take a predetermined action when a threshold corresponding with the monitoring value is exceeded. The threshold may be calculated by an intelligent electronic device (IED) monitoring the motor. The predetermined action may include further monitoring of the motor. The predetermined action may include monitoring equipment not directly monitored by the IED.

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Номер записи: 14
18-04-2013 дата публикации

Fault Location Using Traveling Waves

Номер: US20130096854A1
Автор: Guzman-Casillas Armando, III Edmund O., Mynam Mangapathirao Venkata, Schweitzer, Skendzic Veselin
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Disclosed herein are various embodiments of systems and methods for calculating a fault location in electric power delivery system based on a traveling wave created by an electrical fault in the electric power delivery system. According to one embodiment, an intelligent electronic device may be configured to detect a transient traveling wave caused by an electrical fault. A first traveling wave value of the transient traveling wave may be determined and a corresponding first time associated with the first traveling wave may be determined. The IED may receive a second time associated with a second traveling wave value of the transient traveling wave detected by a remote IED. The distance to the remote IED may be known. An estimated fault location may be generated based on the time difference between the first time and the second time. Additional methods of calculating the fault location may also be employed. 1. A receiving intelligent electronic device (IED) configured to calculate a fault location in electric power delivery system based on a traveling wave created by an electrical fault in the electric power delivery system , the receiving IED comprising:a communications port; detect a transient traveling wave caused by an electrical fault by using a plurality of data samples representing measurements of a parameter of the electric power delivery system;', 'detect a first value of the transient traveling wave;', 'detect a first time associated with the first value;', 'receive via the communication port a second time associated with a second value of the transient traveling wave detected by a remote IED located at a known distance from the receiving IED; and', 'generate an estimated fault location based on the time difference between the first time and the second time., 'control logic in communication with the communications port, the control logic configured to2. The receiving IED of claim 1 , wherein the control logic is further configured to:detect a first ...

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Номер записи: 15
30-05-2013 дата публикации

Protective Device with Metering and Oscillography

Номер: US20130135780A1
Автор: III Edmund O., Schweitzer
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

A device, such as an intelligent electronic device (IED), provides a monitoring and protective function for a power system. The protective function uses stimulus acquired from the power system to detect power system conditions and to take one or more protective actions responsive thereto. The device may detect arc flash events in the power system based upon electro-optical and/or current stimulus measurements obtained therefrom. The stimulus measurements may be recorded to use in metering, validation, identifying detector misoperation, and/or event oscillography. 126-. (canceled)27. An intelligent electronic device (IED) , comprising:a first input configured to receive measurements of electro-optical (EO) radiation acquired at an electrical power system;a second input configured to receive measurements of a second type of stimulus acquired from the electrical power system; andan arc flash detection unit configured to assert an arc flash detection signal in response to EO radiation measurements indicative of an arc flash event and measurements of the second type of stimulus indicative of an arc flash event;wherein the arc flash detection unit is further configured to store EO radiation measurements indicative of nominal operating conditions of the electrical power system on a computer-readable storage medium.28. The IED of claim 27 , wherein the second input is configured to receive current measurements from the electrical power system claim 27 , and wherein the arc flash detection unit is further configured to store current measurements indicative of nominal operating conditions of the electrical power system on the computer-readable storage medium.29. The IED of claim 27 , wherein the arc flash detection unit is further configured to store a record of assertion of the arc flash detection signal and EO radiation measurements corresponding to the assertion on the computer-readable storage medium.30. The IED of claim 27 , further comprising a timestamp module ...

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Номер записи: 16
12-09-2013 дата публикации

Voltage Regulation Using Multiple Voltage Regulator Controllers

Номер: US20130234696A1
Автор: Bryson Michael B., Whitehead David E.
Принадлежит: Schweitzer Engineering Laboratories

Disclosed herein are systems and methods for regulating a voltage profile of an electric power delivery system. According to some embodiments, a system may include a remote voltage regulating device configured to regulate voltage profile by selecting among a plurality of taps on a remote transformer and an associated a remote voltage regulator controller in communication. The remote voltage regulator controller may calculate remote voltage regulation information and may transmit the remote voltage regulation information to a local voltage regulator controller. The local voltage regulator controller may be in communication with a local voltage regulating device configured to regulate the voltage profile of a local portion of the electric power delivery system by selecting among a plurality of taps on a local transformer. The local voltage regulator controller may be configured to receive the remote voltage regulation information and generate a tap change command for the local voltage regulating device. 1. A system for regulating a voltage profile of an electric power delivery system , comprising:a remote voltage regulating device operatively coupled to a remote portion of the electric power delivery system and configured to regulate voltage profile by selecting among a plurality of taps on a remote transformer;a remote voltage regulator controller in communication with the remote voltage regulating device configured to obtain remote power system data, calculate remote voltage regulation information, and transmit the remote voltage regulation information;a local voltage regulating device operatively coupled to a local portion of the electric power delivery system and configured to regulate the voltage profile by selecting among a plurality of taps on a local transformer; a data bus;', 'a remote input in communication with the data bus configured to receive the remote voltage regulation information;', 'a processor in communication with the data bus;', receive the ...

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Номер записи: 17
12-09-2013 дата публикации

Systems and methods for determining residual flux in a power transformer

Номер: US20130238267A1
Автор: Demetrios A. Tziouvaras
Принадлежит: Schweitzer Engineering Laboratories Inc

The present disclosure provides systems and methods for calculating the flux in a core of an unloaded power transformer using current measurements taken from a capacitance-coupled voltage transformer (CCVT) attached to the same phase line as the power transformer. According to various embodiments, the current sensors may both be positioned at zero-voltage points in the CCVT, eliminating the need for high-voltage insulated current sensors. An intelligent electronic device (IED) may determine the magnetic flux within the core of the power transformer using the measured and/or derived currents through capacitive assemblies of the CCVT. The IED may calculate the residual flux in the power transformer when it is de-energized. The IED may use the calculated residual flux to facilitate an optimized re-energization of the power transformer, thereby reducing inrush currents during re-energization.

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Номер записи: 18
26-09-2013 дата публикации

Leveraging inherent redundancy in a multifunction ied

Номер: US20130250458A1
Автор: Bogdan Z. Kasztenny, Dale S. Finney, Normann Fischer
Принадлежит: Schweitzer Engineering Laboratories Inc

Disclosed herein are systems and methods for leveraging the inherent redundancy of electrical measurement inputs available to microprocessor-based intelligent electronic devices (IEDs). Specifically, an IED may receive a plurality of electrical measurements associated with an electric power delivery system, such as measurements associated with a generator. A first protection module may be configured to detect a first type of electrical disturbance using a first subset of the plurality of electrical measurements. A second protection module may be configured to detect a second type of electrical disturbance using a second subset of the plurality of electrical measurements. A first redundant protection module may be configured to verify the detection of the first type of electrical disturbance using at least a portion of the second subset of the plurality of electrical measurements.

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Номер записи: 19
05-12-2013 дата публикации

Thermal Management of a Communication Transceiver in an Electrical Communication Device

Номер: US20130322500A1
Автор: Achanta Shankar V., Gammel Dennis, Thomas Mark A.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Disclosed herein are various systems and methods relating to communication devices that include modular transceivers, such as small form pluggable transceivers. According to one embodiment, a communication device may include a chassis defining an interior and an exterior of the communication device. The chassis includes a top, a bottom, and a plurality of sides that together with the top and the bottom form an enclosure. One of the sides may include a first segment disposed in a first plane and a second segment disposed in a second plane. The second segment includes an outwardly extending communication transceiver housing configured to receive a communication transceiver. The communication transceiver may extend through an aperture in the second segment and into interior of the communication device to contact an electrical connector, while a second portion of the communication transceiver in the communication transceiver housing remains on the exterior of the communication device. 1. A communication device , comprising:a chassis defining an interior and an exterior of the communication device, the chassis comprising:a top;a bottom; a first segment disposed in a first plane;', a communication transceiver housing extending outwardly from the second segment and configured to accept installation of a communication transceiver, and', 'an aperture in the chassis disposed such that a first portion of a communication transceiver inserted into in the communication transceiver housing extends through the second segment and into the interior of the communication device to contact an electrical connector, while a second portion of the communication transceiver in the communication transceiver housing remains on the exterior of the communication device;, 'a second segment disposed in a second plane, the second segment comprising], 'a plurality of sides that together with the top and the bottom form an enclosure, one of the plurality of sides comprisingwherein the communication ...

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Номер записи: 20
26-12-2013 дата публикации

Electric Power System Waveform Search

Номер: US20130346419A1
Автор: Gotshall Stanley P., Hewitt Eric J., Zweigle Gregary C.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure relates to searching electric power system waveforms. Disclosed herein are various systems and methods for improving search performance through indexing electric power system waveforms using waveform attributes such as frequency, amplitude, angle, rate of change, and the like. According to some embodiments, multiple indexes may be used together to find information of interest. A reference signal may be utilized according to some embodiments. Normalizing a plurality of waveforms using a reference signal may facilitate the use of an index for comparing two arbitrary waveforms. This disclosure also relates to detecting and indexing islanding conditions in an electric power system. Various embodiments may utilize information relating to islanding conditions in connection with search operations. 1. A system configured to index data based on at least one characteristic of a plurality of waveforms associated with an electric power distribution system , comprising:a processor in communication with a bus; divide each of the plurality of waveforms into a first plurality of temporal segments;', 'determine at least one index value associated with each of the first plurality of temporal segments for each of the plurality of waveforms;', 'associate the determined index value associated with each of the first plurality of temporal segments for each of the plurality of waveforms with a time stamp; and', 'store the time stamp and the determined index value for each of the first plurality of temporal segments in the first index., 'an index module configured to generate a first index based on at least one characteristic of a plurality of waveforms, the index module configured to, 'a non-transitory computer-readable storage medium in communication with the bus, the non-transitory computer readable storage medium comprising2. The system of claim 1 , wherein the plurality of waveforms comprise synchrophasor data.3. The system of claim 1 , wherein the at least one ...

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Номер записи: 21
27-02-2014 дата публикации

Systems and methods for rotor angle measurement in an electrical generator

Номер: US20140055126A1
Автор: Charles L. Ramiller, Nicholas C. Seeley
Принадлежит: Schweitzer Engineering Laboratories Inc

Disclosed herein are systems and methods for rotor angle measurement in an electrical generator. According to one embodiment, an intelligent electronic device may comprise control logic configured to generate a reference signal and to generate a rotational position signal based upon an indicator of a rotational position of a rotor in an electrical generator. The control logic may further be configured to detect a relative shift between the reference signal and the rotational position signal and to determine the rotational position of the rotor based upon the relative shift. A power angle of the electrical generator may be calculated based upon the rotational position of the rotor. According to certain embodiments, the control logic may further be configured to generate a control instruction to reduce the power angle in response to determining that the power angle exceeds a threshold.

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Номер записи: 22
06-03-2014 дата публикации

MOTOR RELAY WITH INTEGRATED ARC-FLASH DETECTION

Номер: US20140063661A1
Автор: "DAversa Angelo", Jayne Robert I., Kesler James R.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Disclosed herein are various embodiments of devices and related methods for detecting an electrical arc event using a motor management relay and for suppressing the electrical arc event. The motor management relay may incorporate an optical arc-flash sensor configured to detect an optical event. Control logic may analyze the optical event and determine whether the optical event corresponds to an electrical arc event. When an electrical arc event is detected an instruction may be issued via a control port in communication with the control logic to implement a protective action. According to various embodiments, a plurality of sensors for monitoring electrical characteristics of a motor may also be in communication with the control logic. Input from the sensors may be analyzed in order to determine whether the optical event corresponds to an electrical arc event. 1. A motor management relay , comprising:an optical arc-flash sensor configured to detect an optical event;control logic configured to analyze the optical event and determine whether the optical event corresponds to an electrical arc event; anda control port in communication with the control logic configured to issue an instruction to an associated protective device to implement a protective action based on a determination that the optical event corresponds to an electrical arc event.2. The motor management relay of claim 1 , wherein the optical arc-flash sensor comprises a two-axis sensor.3. The motor management relay of claim 1 , further comprising a housing to contain the optical arc-flash sensor.4. The motor management relay of claim 3 , wherein the arc-flash sensor is disposed with respect to the housing such that the arc-flash sensor is at least partially disposed on two sides of the housing.5. The motor management relay of claim 3 , further comprising a plurality of status indicators disposed on the housing.6. The motor management relay of claim 3 , wherein the housing is configured to operate within a ...

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Номер записи: 23
06-03-2014 дата публикации

Power management in a network of stationary battery powered control, automation, monitoring and protection devices

Номер: US20140064162A1
Автор: Laurence V. Feight, Ryan W. Swartzendruber
Принадлежит: Schweitzer Engineering Laboratories Inc

A faulted circuit indicator periodically joins a network to report information and receive commands. The faulted circuit indicator optimizes the transmit power used to join the network so that an acceptable network acquisition time and/or robust routing through multiple nodes are obtained.

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Номер записи: 24
06-03-2014 дата публикации

Network Access Management via a Secondary Communication Channel

Номер: US20140068711A1
Автор: III Edmund O., Schweitzer, Smith Rhett, Weber Mark, Whitehead David E.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure provides for selectively enabling a primary communication channel upon receipt of enablement instructions received via a secondary communication channel. In some embodiments, a first intelligent electronic device (IED) may be connected to a second IED via a primary communication channel. In various embodiments, the primary communication channel may be selectively and/or temporarily enabled by transmitting an enablement instruction via a secondary communication channel. The secondary communication channel may be relatively more secure than the primary communication channel. In some embodiments, the secondary communication channel may also connect the first and second IEDs. Accordingly, the first IED may transmit an enablement instruction to the second IED in order to temporarily enable communication via the primary communication channel between the first and second IEDs. 1. A method for enabling network communication with an intelligent electronic device (IED) , comprising:disabling communication via a first communication channel with the IED;enabling communication via a second communication channel with the IED, wherein the first communication channel and the second communication channel are physically distinct communication channels,wherein the second communication channel is a private communication channel that is physically secure;receiving an enablement instruction via the private and physically secure second communication channel, the enablement instruction providing an instruction to enable communication via the first communication channel with the IED;enabling communication via the first communication channel with the IED in response to the enablement instruction; andreceiving communication via the first communication channel.2. The method of claim 1 , further comprising the intelligent electronic device disabling communication via the first communication channel in response to a disabling event.3. The method of claim 1 , wherein the ...

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Номер записи: 25
13-03-2014 дата публикации

Fault Location Using Traveling Waves

Номер: US20140074414A1
Автор: Guzman-Casillas Armando, III Edmund O., Mynam Mangaoathirao Venkata, Schweitzer, Skendzic Veselin
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Disclosed herein are various embodiments of systems and methods for calculating a fault location in electric power delivery system based on a traveling wave created by an electrical fault in the electric power delivery system. According to one embodiment, an intelligent electronic device may be configured to detect a transient traveling wave caused by an electrical fault. A first traveling wave value of the transient traveling wave may be determined and a corresponding first time associated with the first traveling wave may be determined. The IED may receive a second time associated with a second traveling wave value of the transient traveling wave detected by a remote IED. The distance to the remote IED may be known. An estimated fault location may be generated based on the time difference between the first time and the second time. Additional methods of calculating the fault location may also be employed. 135-. (canceled)36. A receiving intelligent electronic device (“IED”) configured to calculate a fault location in an electric power delivery system based on a traveling wave created by an electrical fault in the electric power delivery system , the receiving IED comprising:a communications port; detect a first value of the transient traveling wave;', 'detect a first time associated with the first value;', 'compensate the first time based on a delay associated with propagation of the transient traveling wave in a secondary cable of a known length in communication with the receiving IED; and,', 'generate an estimated fault location based on the first time., 'detect a transient traveling wave caused by an electrical fault by using a plurality of data samples representing measurements of a parameter of the electric power delivery system;'}, 'control logic in communication with the communications port, the control logic configured to37. The IED of claim 36 , wherein the control logic is further configured to:receive via the communication port a second time associated ...

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Номер записи: 26
10-04-2014 дата публикации

DISTRIBUTED COORDINATED WIDE-AREA CONTROL FOR ELECTRIC POWER DELIVERY SYSTEMS

Номер: US20140100702A1
Автор: III Edmund O., Schweitzer, Whitehead David E., Zweigle Gregary C.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Distributed controllers in an electric power delivery system obtain measurements and equipment status, calculate derived values, and determine IED state, and share such with other distributed controllers and coordination controllers. Distributed controllers and coordination controllers further refine measurements, equipment status, derived values, and IED state. Control of the electric power delivery system is coordinated among the distributed controllers and the coordination controllers. 1. A controller configured to implement coordinated control actions in an electrical power delivery system , the controller comprising:a communications interface;a processor communicatively coupled to the communications interface; and derive a first state of at least one portion of the electric power delivery system based upon an indication received via the communications interface;', 'calculate a first controller condition;', 'determine a control action based upon the first state and the first controller condition; and', 'communicate the first state, the first controller condition, and the control action to a subscribing controller via the network; and, 'a non-transitory computer-readable storage medium comprising instructions that, when executed by the processor, enable the controller to2. The controller of claim 1 , wherein the instructions further enable the controller to:generate a component model based on the first state; andmodel a response of a component of the electrical power delivery system based on the component model; andwherein the control action is based at least in part on the modeled response of the component.3. The controller of claim 2 , wherein the component modeled by the component model comprises one of the controller claim 2 , a subscribing controller claim 2 , an intelligent electronic device claim 2 , and a load.4. The controller of claim 2 , wherein the instructions further enable the controller to compare the first state to a stability condition of the ...

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Номер записи: 27
13-01-2022 дата публикации

CONTROL PANEL MODULE ASSEMBLY DEVICES AND TECHNIQUES

Номер: US20220015276A1
Автор: Alzate Julian M., Gentry Bryan, Hildenbrand Kyle Ellis, Soller Cameron Scott
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Systems, apparatus, methods, and techniques of assembly of discrete modules of a control panel are disclosed. The modules can be independently wired, tested, and installed into a control panel. Module definitions are defined specifying components to perform the electrical function, a mechanical arrangement of the components, electrical connections, and logical interactions of the module. A bill of materials can be generated based on a designation of a set of modules for a control panel and the module definitions. Modularly assembled control panels are disclosed. An assembly frame is described herein for temporarily mounting components of a module for independent assembly of a control module and for eventual removal and installation into a control panel frame. The assembly frame may include a faceplate frame and side frames and temporary mounting features. 1. A module assembly station for supporting a module of a control panel during assembly , comprising:an assembly surface providing a horizontal work surface;a lift coupled to the assembly surface and configured to adjust a height of the horizontal work surface;a faceplate frame disposed on the horizontal work surface, the faceplate frame to accept and support a faceplate of a module for ease of viewing and access by a user during assembly of a module, the faceplate frame including mounting features to which the faceplate of the of the module is to be mounted;a first side frame pivotably coupled to a first lateral side of the faceplate frame and rotatable between a narrow position and an open position, the first side frame extending rearward from the faceplate frame in the narrow position and the open position to provide accessibility to the user during assembly, the first side frame including mounting features for temporarily mounting a first cross brace to support components of the module during assembly and after permanent mounting of the first cross brace during installation of the module into a control panel; ...

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Номер записи: 28
10-01-2019 дата публикации

ESTIMATION OF A WAVEFORM PERIOD

Номер: US20190011486A1
Автор: Kasztenny Bogdan Z., Lee Tony J.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Disclosed herein are systems and methods for estimating a period and frequency of a waveform. In one embodiment a system may comprise an input configured to receive a signal comprising a representation of the waveform. A period determination subsystem may calculate an estimated period of the signal based on a period determination function. An estimated period adjustment subsystem may determine an adjustment to the estimated period based on a result of the period determination function. A quality indicator subsystem configured to evaluate a measurement quality indictor function based on the estimated period, and to selectively update the period of the waveform based on the measurement quality indicator. A control action subsystem configured to implement a control action based on the period of the waveform. 1. A system configured to determine a period of a waveform , the system comprising:an input configured to receive a signal comprising a representation of the waveform of a power delivery system;a period determination subsystem configured to calculate an estimated period of the signal based on a period determination function;an estimated period adjustment subsystem configured to determine an adjustment to the estimated period based on a result of the period determination function; determine a measurement quality indicator of the estimated period by evaluating a measurement quality indicator function based on the estimated period; and', 'update a previously determined period of the waveform with the estimated period based at least in part on the measurement quality indicator; and, 'a quality indicator subsystem configured toa control action subsystem configured to implement a control action based on the updated estimated period of the waveform.2. The system of claim 1 , wherein the quality indicator subsystem is configured to apply a variable gain to samples of the signal based on the measurement quality indicator function.3. The system of claim 2 , wherein the ...

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Номер записи: 29
12-01-2017 дата публикации

FAULT DETECTION IN ELECTRIC POWER DELIVERY SYSTEMS USING UNDERREACH, DIRECTIONAL, AND TRAVELING WAVE ELEMENTS

Номер: US20170012424A1
Автор: Guzman-Casillas Armando, III Edmund O., Kasztenny Bogdan Z., Lee Tony J., Mynam Mangapathirao Venkata, Schweitzer, Skendzic Veselin, Whitehead David E.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure pertains to systems and methods for detecting faults in an electric power delivery system. In one embodiment, a system may include a data acquisition subsystem configured to receive a plurality of representations of electrical conditions. The system may also include a traveling wave differential subsystem configured to determine an operating quantity based on the plurality of representations of electrical conditions. The traveling wave differential subsystem may also determine a restraint quantity based on the plurality of representations of electrical conditions. The traveling wave differential subsystem may detect a traveling wave generated by the fault based on the plurality of representations. A fault detector subsystem may be configured to declare a fault based on a comparison of the operating quantity and the restraint quantity. A protective action subsystem may implement a protective action based on the declaration of the fault. 124-. (canceled)25. A system configured to detect a fault in an electric power delivery system , comprising:a data acquisition subsystem configured to receive a plurality of representations of electrical conditions associated with the electric power delivery system; determine an operating quantity from a representation of the plurality of representations of electrical conditions at a first time associated with a first portion of the electric power delivery system and a representation of the plurality of representations of electrical conditions at a second time associated with a second portion of the electric power delivery system, a difference between the first time and the second time corresponding with a propagation delay associated with the electric power delivery system;', 'determine a restraint quantity based on the plurality of representations of electrical conditions associated with the electric power delivery system;', 'detect a traveling wave generated by the fault based on the adjusted plurality of ...

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Номер записи: 30
11-01-2018 дата публикации

Slip-Dependent Motor Model

Номер: US20180013375A1
Автор: Donolo Marcos A.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure pertains to systems and methods configured to monitor and protect an electric motor during startup using a motor model. The motor model parameters may be calculated using measurements taken during a calibration start of the electric motor. The measurements may include slip, stator current, stator voltage, frequency, and/or other electrical or physical parameters. In some embodiments, the motor model parameters may be calculated by minimizing the difference between a measured slip and a calculated slip. The motor model may comprise a variety of parameters used to determine operation parameters of the motor during the startup. In one specific embodiment, the motor model may determine a thermal capacity used (TCU). The TCU may be compared to a threshold value to determine whether protective action is necessary. 1. A system configured to generate a slip-dependent motor model to monitor and protect an electric motor during a motor start , comprising:an electrical measurement input to monitor at least one electrical condition of electrical energy supplied to the electric motor;a slip input configured to monitor a measured slip of the electric motor; generate a motor model based on the at least one electrical condition and the measured slip during a calibration motor start;', 'measure the at least one electrical condition of the motor during a subsequent motor start;', 'determine a calculated slip of the motor during the subsequent start based on the at least one electrical condition and the motor model.', 'implement a control action based on the calculated slip and the motor model., 'a processor in communication with the electrical measurement input and the slip input and configured to2. The system of claim 1 , wherein the electric motor comprises a synchronous motor.3. The system of claim 1 , wherein the at least one measured electrical condition comprises one of an electric current claim 1 , and an electric voltage.4. The system of claim 1 , ...

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Номер записи: 31
14-01-2021 дата публикации

SECURE ELECTRIC POWER DELIVERY SYSTEM PROTECTION DURING CYBER THREATS

Номер: US20210014196A1
Автор: Casebolt David J., Gubba Ravikumar Krishnanjan, III Edmund O., Lee Tony J., Schweitzer, Wade Austin Edward, Whitehead David E.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Systems and methods may maintain protection of electric power delivery systems in the event of an attack on protection and/or control features of the power system. Primary protective functions may be physically isolated from other functions in primary protection relays. Integrators may facilitate non-primary protection functions and disconnect all communication with primary protection relays in the event of an attack. Primary protection relays maintain protection functions even during the attack or unavailability of the integrators. 1. A system to maintain protection of an electric power delivery system during a cyber-attack , comprising: a power system signal input to receive electric power delivery system signals from one or more external elements of the electric power delivery system;', 'a protection subsystem to determine an operating condition of the electric power delivery system using the signals and to implement a protective action command when the operating condition is outside of a predetermined operating parameter;', 'a protective action output to transmit a protective action command to be performed by primary equipment of the electric power delivery system; and', a communication subsystem to control communications with the primary protection relay; and', 'a kill switch subsystem operable, upon activation, to restrict the communications with the primary protection relay;, 'a supervisory system in communication with the primary protection relay, the supervisory system comprising, 'wherein the primary protection relay continues to provide protection of the electric power delivery system after activation of the kill switch subsystem., 'a primary protection relay to provide protection to the electric power system, the primary protection relay comprising2. The system of claim 1 , wherein the supervisory system further comprises a contact input for activation of the kill switch subsystem.3. The system of claim 1 , wherein the supervisory system comprises an ...

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Номер записи: 32
21-01-2021 дата публикации

HIGH-FIDELITY VOLTAGE MEASUREMENT USING A CAPACITANCE-COUPLED VOLTAGE TRANSFORMER

Номер: US20210018538A1
Автор: III Edmund O., JR. Robert, Kasztenny Bogdan Z., Lopez, Mallett Travis C., Schweitzer, Skendzic Veselin
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure pertains to systems and methods for detecting traveling waves in electric power delivery systems. In one embodiment, a system comprises a capacitance-coupled voltage transformer (CCVT) in electrical communication with the electric power delivery system, the CCVT comprising a stack of capacitors and an electrical contact to a first ground connection. Electrical signals from accessible portions of the CCVT are used to detect traveling waves. Current and/or voltage signals may be used. In various embodiments, a single current may be used. The traveling waves may be used to detect a fault on the electric power delivery system. 1. A system to detect a fault in an electric power delivery system , comprising:a capacitance-coupled voltage transformer (CCVT) in electrical communication with the electric power delivery system, the CCVT comprising a stack of capacitors and an electrical contact to a first ground connection;a first current measurement device disposed between the stack of capacitors and the first ground connection, the first current measurement device to provide a first electrical signal corresponding to a first current flowing through the CCVT;a second current measurement device disposed in electrical connection with a parasitic electric flow from the CCVT, the second current measurement device to provide a second electrical signal corresponding to a parasitic current; generate a first voltage signal based on the first electrical signal from the first current measurement device and the second electrical signal from the second current measurement device;', 'identify an incident traveling wave and a reflected traveling wave based on the first voltage signal and the measurement of the primary current;', 'detect a fault based on the incident traveling wave and the reflected traveling wave; and, 'an intelligent electronic device (IED) in electrical communication with the first and second current measurement devices toa protective action module ...

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Номер записи: 33
16-01-2020 дата публикации

Time Signal Manipulation Detection Using Remotely Managed Time

Номер: US20200018861A1
Автор: Bryson Michael B., Haes Dennis
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Systems and methods are provided for monitoring or protecting an electric power distribution system using protective devices that may rely on accurate time signals from a common time source. A first protective device may receive a first time signal deriving from the common time source and a second protective device may receive a second time signal deriving from the common time source. The first time signal and the second time signal may be compared; when a difference between them exceeds a defined threshold, time signal manipulation may be detected. The protective devices may modify their operation in response to or to account for the time signal manipulation. 1. A protective system for detecting and mitigating against manipulated time signals in an electric power delivery system , the protective system comprising: provide a first protective operation at the local location;', 'receive a local time signal generated based at least in part on a common time source; and', 'transmit the local time signal via a communication system; and, 'a first protective device disposed at a local location of the electric power delivery system, wherein the first protective device is configured to provide a second protective operation at the remote location;', 'receive a remote time signal generated based at least in part on the common time source;', 'receive the local time signal from the first protective device via the communication system;', 'calculate a time difference between the remote time signal and the local time signal, wherein the time difference is at least partly due to latencies in communication between the first protective device and second protective device;', 'compare the time difference with a threshold; and', 'when the time difference exceeds the threshold, detect a time signal manipulation that indicates that the local time signal or the remote time signal, or both, are inaccurate., 'a second protective device in communication with a remote location of the electric ...

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Номер записи: 34
17-04-2014 дата публикации

COORDINATED HIGH-IMPEDANCE FAULT DETECTION SYSTEMS AND METHODS

Номер: US20140104738A1
Автор: Hou Daqing, III Edmund O., Mynam Mangapathirao Venkata, Schweitzer
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Systems and methods are presented for detecting high-impedance faults (HIFs) in an electric power delivery system using a plurality of coordinated high-impedance fault detection systems. In certain embodiments, a method for HIFs may include receiving first and second current representations associated with first and second locations of the electric power delivery system respectively. Based on at least one of the first and second current representations, the occurrence of an HIF may be determined. A relative location of the HIF may be determined based on a relative amount of interharmonic content associated with an HIF included in the first and second current representations, and a protective action may be taken based on the determined relative location. 1. A method for detecting high-impedance faults in an electric power delivery system comprising:receiving a first current representation associated with a first location of the electric power delivery system;receiving a second current representation associated with a second location of the electric power delivery system;determining, based on at least one of the first and second current representations, the occurrence of a high-impedance fault on the electric power delivery system;determining a relative location of the high-impedance fault based, at least in part, on a relative amount of signal content associated with a high-impedance fault included in the first and second current representations; andimplementing a first protective action based on the determined relative location.2. The method of claim 1 , wherein the first current representation comprises a measurement by a first IED and the second current representation comprises a measurement by a second IED.3. The method of claim 1 , wherein the first protective action comprises issuing a control signal to electrically isolate a portion of the electric power delivery system including the high-impedance fault.4. The method of claim 1 , further comprising: ...

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Номер записи: 35
17-04-2014 дата публикации

DETECTION AND RESPONSE TO UNAUTHORIZED ACCESS TO A COMMUNICATION DEVICE

Номер: US20140109182A1
Автор: Gordon Colin, Smith Rhett
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

A communication gateway consistent with the present disclosure may detect unauthorized physical or electronic access and implement security actions in response thereto. A communication gateway may provide a communication path to an intelligent electronic device (IED) using an IED communications port configured to communicate with the IED. The communication gateway may include a physical intrusion detection port and a network port. The communication gateway may further include control logic configured to evaluate physical intrusion detection signal. The control logic may be configured to determine that the physical intrusion detection signal is indicative of an attempt to obtain unauthorized access to one of the communication gateway, the IED, and a device in communication with the gateway; and take a security action based upon the determination that the indication is indicative of the attempt to gain unauthorized access. 1. A communication device configured to provide a communication path to an intelligent electronic device (IED) and configured to detect and remediate unauthorized access , the communication device comprising:an IED communications port configured to communicate with an IED;a network port configured to transmit information received from the IED via a network and to transmit information received from the network to the IED; and receive an intrusion detection signal;', 'determine that the intrusion detection signal is indicative of an attempt to obtain unauthorized access to one of the communication device, the IED, and a device in communication with the communication device; and', 'take a security action based upon the determination that the intrusion detection signal is indicative of the attempt to gain unauthorized access., 'control logic in communication with the IED communications port and the network port, the control logic configured to2. The communication device of claim 1 , wherein the control logic is further configured to generate a baseline ...

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Номер записи: 36
10-02-2022 дата публикации

CAPACITANCE-COUPLED VOLTAGE TRANSFORMER MONITORING

Номер: US20220043070A1
Автор: JR. Robert, Lopez, Mallett Travis C.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure pertains to systems and methods for monitoring a capacitance-coupled voltage transformer (CCVT) in electrical communication with the electric power delivery system, the CCVT comprising a stack of capacitors and an electrical contact to a first ground connection. A first current transformer is disposed between the stack of capacitors and the first ground connection. The current transformer provides an electrical signal corresponding to a current associated with the CCVT. A second transformer is disposed to provide a second electrical signal related to the CCVT. The second signal may be a voltage signal or a current signal. An intelligent electronic device (IED) in electrical communication with the current measurement devices monitors a health factor comprising a ratio of magnitudes or a difference between phases from the transformers at a single frequency. The health factor is compared against an acceptable range and an alarm is generated when the range is exceeded. 1. A system to monitor the health of a capacitance-coupled voltage transformer (CCVT) of an electric power delivery system , comprising:a CCVT in electrical communication with the electric power delivery system, the CCVT comprising a stack of capacitors and an electrical contact to a first ground connection;a first transformer disposed between the stack of capacitors and the first ground connection, the first instrument transformer to provide a first current signal corresponding to a first current flowing through the CCVT;a second transformer disposed on the CCVT to provide a second electrical signal corresponding to the CCVT; receive the first current signal from the first transformer;', 'receive the second electrical signal from the second transformer;', 'calculate a health factor for a common frequency from the first current signal and the second signal;', 'compare the health factor against a health range; and', 'when the health factor exceeds the health range, signal an alarm., ...

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Номер записи: 37
24-04-2014 дата публикации

Time Distribution Switch

Номер: US20140111249A1
Автор: Achanta Shankar V., Loehner Henry, Whitehead David E.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Systems and methods for detecting the failure of a precision time source using an independent time source are disclosed. Additionally, detecting the failure of a GNSS based precision time source based on a calculated location of a GNSS receiver is disclosed. Moreover, the system may be further configured to distribute a time derived from the precision time source as a precision time reference to time dependent devices. In the event of a failure of the precision time source, the system may be configured to distribute a time derived from a second precision time source as the precision time signal during a holdover period. 1. A method comprising:receiving, at a time distribution device, two or more consecutive time signals from each of a plurality of time sources;determining, for each time source, a duration between each of the two or more consecutive time signals, wherein the duration is based on an internal oscillator;comparing the duration between the two or more consecutive time signals for each time source to determine a time source with the lowest variation in the duration between the two or more consecutive time signals;selecting the time source with the lowest variation as a best available time source; anddistributing the best available time source to one or more consuming devices.2. The method of claim 1 , wherein the internal oscillator comprises a high accuracy oscillator.3. The method of claim 2 , wherein the high accuracy oscillator comprises one of: an oven controlled crystal oscillator (OCXO); a temperature compensated crystal oscillator (TCXO); a voltage controlled crystal oscillator (VCXO); a rubidium oscillator; or an atomic oscillator.4. The method of claim 1 , wherein the plurality of time sources include one or more of: Inter-Range Instrumentation Group (IRIG) protocol claim 1 , a global navigation satellite system (GNSS) claim 1 , a National Institute of Science and Technology (NIST) broadcast claim 1 , an Institute of Electrical and Electronics ...

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Номер записи: 38
24-04-2014 дата публикации

Manipulation Resilient Time Distribution Network

Номер: US20140111377A1
Автор: Achanta Shankar V., Huntley Christopher R., Zweigle Gregary C.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Disclosed herein is a system for detecting manipulation of a global time source such as a Global Navigational Satellite System (GNSS) signal and mitigating against such manipulation. A plurality of receivers with geographical diversity receive GNSS signals, and calculate a time signal to be distributed to consuming devices. The receivers also communicate calculated time signals with other receivers. The receivers compare the time signals, and when a difference between the time signals exceeds a predetermined threshold, the receivers indicate that manipulation is likely. Such indication is shared across the network of receivers. The indication is further shared with consuming devices of the time signal from the compromised receiver. A second time signal that is not compromised may be shared with the consuming devices and/or used by the consuming devices. The consuming devices may modify their behavior when in receipt of the indication. 1. A system for detecting and mitigating against manipulated time signals , comprising:a first receiver configured to receive a first plurality of radio signals from a global time source and calculate a first time signal from the first plurality of radio signals; and receive the first time signal from the first receiver;', 'calculate a time difference between the first time signal and the second time signal;', 'compare the time difference with a defined time difference threshold; and', 'communicate a manipulation alarm to the first receiver in response to determining that the time difference exceeds the defined time difference threshold., 'a second receiver configured to receive a second plurality of radio signals from the global time source and calculate a second time signal from the second plurality of radio signals, the second receiver further configured to2. The system of claim 1 , wherein the first receiver is further configured to calculate a signal integrity based on the first plurality of radio signals and transmit the signal ...

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Номер записи: 39
23-01-2020 дата публикации

VOLTAGE ASSESSMENT PREDICTION SYSTEM FOR LOAD/GENERATION SHEDDING

Номер: US20200026337A1
Автор: Cai Niannian, Khatib Abdel Rahman
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure relates to systems and methods of predicting voltages for various contingencies. For example, a monitoring system may include a processor that acquires at least one contingency of an electric power delivery system. The processor may acquire an expected control action based on the at least one contingency from controllers/IEDs. The processor may predict a voltage of at least one bus of the electric power delivery system by simulating the change in the state of the electric power delivery system caused by the expected control action. The processor may determine that the voltage of the at least one bus is predicted to violate one or more operational settings of the electric power delivery system if the at least one contingency were to occur. The processor may provide an indication that the voltage violates the one or more operational settings on a display of the electronic device. 1. A non-transitory , computer readable medium comprising instructions that , when executed by a processor of an electronic device , cause the processor to:acquire at least one contingency of an electric power delivery system;predict a voltage of at least one bus of the electric power delivery system by simulating an occurrence of the at least one contingency;determine that the voltage of the at least one bus is predicted to violate one or more operational settings of the electric power delivery system if the at least one contingency were to occur; andprovide an indication that the voltage violates the one or more operational settings on a display of the electronic device.2. The non-transitory claim 1 , computer readable medium of claim 1 , comprising instructions that claim 1 , when executed by the processor claim 1 , cause the processor to predict a voltage of the at least one bus based on the generator active power mode claim 1 , a reactive power control mode claim 1 , or both.3. The non-transitory claim 1 , computer readable medium of claim 1 , comprising ...

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Номер записи: 40
10-02-2022 дата публикации

RESILIENCE TO SINGLE EVENT UPSETS IN SOFTWARE DEFINED NETWORKS

Номер: US20220045941A1
Автор: Powers David J., Robinson Kylan T.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure pertains to improving resilience to single event upsets (“SEUs”) in a software-defined network (“SDN”). In one embodiment, a system may include a communications interface to receive and transmit a data packet. A primary data flow repository may store a plurality of communication flows to be used to route the data packet. A secondary data flow repository may store a subset of communication flows to be used to route a data packet. A system may search the plurality of communication flows in the primary data flow repository based on a criteria associated with the data packet. If no communication flow satisfies the criteria, a secondary data flow repository may be searched. The data packet may be routed according to a communication flow in the secondary data flow repository. The communication flow from the secondary data flow repository may be duplicated in the primary data flow repository. 1. A network device to route data packets in a software-defined network (SDN) , the network device comprising:a communications interface to receive and transmit a data packet;a primary data flow repository to store a plurality of communication flows to be used to route the data packet;a redundant data flow repository to store at least a subset of communication flows also stored in the primary data flow repository; search the plurality of communication flows in the primary data flow repository based on a criteria associated with the data packet;', 'determine that none of the plurality of communication flows satisfy the criteria;', 'search the redundant data flow repository based on the criteria associated with the data packet;', 'identify at least one of the subset of communication flows in the redundant data flow repository that satisfies the criteria; and', 'route the data packet via the communications interface and based on the at least one of the subset of communication flows that satisfies the criteria; and, 'a traffic routing subsystem to 'duplicate the at ...

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Номер записи: 41
23-01-2020 дата публикации

FIXED LATENCY CONFIGURABLE TAP DIGITAL FILTER

Номер: US20200028494A1
Автор: Achanta Srinivas
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

A fixed latency configurable tap or fixed-tap digital filter may filter a signal in a fixed amount of time, regardless of the number of taps. The filter may include one or more of a clock, a plurality of registers in a shift register, an adder, an accumulator, and/or a scaler. In at least one embodiment, a running average may be maintained as samples are received such that the latency remains fixed with a constant number of clock cycles. 1. A fixed latency digital filter with a selectable tap length , comprising: 'wherein, for each sampling interval of the digital filter, the first register receives a new sampled value and shifts stored sampled values within the shift register, such that after a plurality of sampling intervals, each sampled value is shifted from the first register through the plurality of intermediary registers to the last register;', 'a shift register with a number of registers equal to a selected tap length, including a first register, a plurality of intermediary registers, and a last register,'}an adder to generate a difference between a sampled value stored in the last shift register and a sampled value stored in the first register during each sampling interval;an accumulator that, for each sampling period, generates an accumulation value by adding a difference generated by the adder during a previous sampling period to a sum of prior differences generated by the adder; anda scaler to generate a filtered value output by multiplying the accumulation value by 1/C, where C is a constant.2. The filter of claim 1 , wherein the constant claim 1 , C claim 1 , is equal to the tap length claim 1 , such that the digital filter is a moving average digital filter.3. The filter of claim 1 , wherein the sampled values comprise sampled values from an electrical power line.4. The filter of claim 1 , further comprising an input to receive a timing signal from a clock that defines the sampling interval of the digital filter.5. The filter of claim 1 , further ...

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Номер записи: 42
24-04-2014 дата публикации

Time Distribution with Multi-Band Antenna

Номер: US20140114608A1
Автор: Achanta Shankar V., Loehner Henry, Whitehead David E.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Systems and methods for detecting the failure of a precision time source using an independent time source are disclosed. Additionally, detecting the failure of a GNSS based precision time source based on a calculated location of a GNSS receiver is disclosed. Moreover, the system may be further configured to distribute a time derived from the precision time source as a precision time reference to time dependent devices. In the event of a failure of the precision time source, the system may be configured to distribute a time derived from a second precision time source as the precision time signal during a holdover period. 1. A method comprising:receiving, via a multi-band antenna, a first time signal from a first precision time source;receiving, via the multi-band antenna, a second time signal from a second precision time source independent from the first precision time source;comparing the first time signal with the second time signal; anddetecting a failure of the first precision time source in response to the comparing showing that a variation of the first time signal from the second time signal exceeds a defined margin.2. The method of claim 1 , wherein the first precision time source is a global navigation satellite system (GNSS) time source and the first time signal is a GNSS pulse per-second (PPS) signal.3. The method of claim 1 , wherein the second precision time source is a WWVB time source and the second time signal is a WWVB PPS.4. The method of claim 1 , further comprising:indicating an error condition in response to detecting a failure of the first precision time source.5. The method of claim 1 , further comprising:in response to detecting a failure of the first precision time source, relying on the second precision time source.6. The method of claim 1 , further comprising the step of providing a time signal to an intelligent electronic device (IED).7. A system comprising:a first receiver configured to receive a first signal including a first precision ...

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Номер записи: 43
24-04-2014 дата публикации

Voting Scheme for Time Alignment

Номер: US20140114731A1
Автор: Aaron E. Wright
Принадлежит: Schweitzer Engineering Laboratories Inc

Systems and methods for time aligning time-stamped measurements using a voting scheme are disclosed. The system and method filter incoming measurements based on whether the time-stamped measurements fall within a defined time window. In response to determining that the time stamp falls within the defined time window, the time-stamped measurement is added to a time slice corresponding with the time stamp. In response to determining that the time-stamped measurement does not fall within the defined time window, the time window is re-established based on a voting scheme.

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Номер записи: 44
28-01-2021 дата публикации

REFERENCE SIGNAL GENERATING METHOD FOR DISTANCE AND DIRECTIONAL PROTECTION ELEMENTS

Номер: US20210028611A1
Автор: Brusilowicz Bartosz Jan
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure relates to generating reference signals for distance and directional elements in power systems. For example, an intelligent electronic device (IED) may receive A-phase, B-phase, and C-phase electrical measurements of a power system. The IED may transform the A-phase, B-phase, and C-phase measurements to a d-component, a q-component, and a 0-component. The IED may include an adaptive notch filter that reduces or eliminates a double frequency component that may be present when step changes of frequency and/or amplitude occur and/or when the A-phase, B-phase, and C-phase measurements have different amplitudes. By reducing the double frequency component, the IED may generate a more accurate ω which may allow for more accurately tracking changes to the polarizing source. Further, the IED may separately add inertia to the estimated angular frequency used in generating a reference signal. 1. An intelligent electronic device (IED) , comprising:one or more inputs configured to receive at least an A-phase measurement, a B-phase measurement, and a C-phase measurement; transform, via an abc/dq0 transform, the A-phase measurement, the B-phase measurement, and the C-phase measurement into at least a d-component signal and a q-component signal;', 'determine the estimated angular frequency, based at least in part on the q-component signal, to be used by the abc/dq0 transform;', 'adding additional inertia to the estimated angular frequency separately from determining the estimated angular frequency; and', 'provide one or more reference signals based on the estimated angular frequency with the additional inertia added., 'processing circuitry configured to2. The IED of claim 1 , wherein the processing circuitry comprises:a proportional-integral (PI) controller configured to provide an integral signal and a proportional signal; anda notch filter, between the PI controller and the abc/dq0 transform, configured to receive the q-component signal and to provide a ...

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Номер записи: 45
05-02-2015 дата публикации

Point-to-Multipoint Polling in a Monitoring System for an Electric Power Distribution System

Номер: US20150035681A1
Автор: Bryson, JR. Richard Paul, Sagen Eric
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

An automation controller may wirelessly poll a plurality of remote monitoring devices configured to monitor an electric power distribution system and store monitored system data collected therefrom. The automation controller may be wirelessly coupled to the plurality of remote monitoring devices using a spread-spectrum protocol, such as Bluetooth®. The automation controller may gather the monitored system data using the Distributed Network Protocol (DNP3). DNP3 packets may be communicated as the payload of Bluetooth® packets. The spread-spectrum protocol may limit the number of devices to which the automation controller may be actively connected at one time. Accordingly, the automation controller may couple and uncouple from the remote monitoring devices in a round-robin pattern to collect the monitored system data from all of the remote monitoring devices. The automation controller may provide engineering access and/or collect relay event data using the spread-spectrum protocol and a high-bandwidth protocol. 1. A system for monitoring an electric power distribution system at a plurality of points , the system comprising:a plurality of remote monitoring devices, each configured to monitor a property of the electric power distribution system, and each comprising a monitoring device transceiver configured to communicate using a spread-spectrum radio protocol; determining a next remote monitoring device in the predetermined order,', 'communicatively coupling the controller transceiver to the monitoring device transceiver of the determined remote monitoring device, wherein coupling comprises creating a shared spreading pattern,', 'sending a poll for the monitored system data to the determined remote monitoring device,', 'receiving a response comprising the monitored system data from the determined remote monitoring device, and', 'uncoupling the controller transceiver from the monitoring device transceiver of the determined remote monitoring device., 'an automation ...

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Номер записи: 46
01-02-2018 дата публикации

Fault Detection and Protection During Steady State Using Traveling Waves

Номер: US20180034258A1
Автор: III Edmund O., Kasztenny Bodgan Z., Schweitzer, Whitehead David E.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

An electric power delivery system may be protected upon occurrence of a fault condition by the systems and methods disclosed herein by detecting the fault condition and signaling a protective action before the overcurrent condition reaches the protective equipment. The protective action may be an opening of a circuit breaker or engagement of a fault current limiter. The overcurrent condition may be a non-steady-state condition. The fault may be detected using traveling wave or incremental quantity techniques. 1. A device for detecting a fault in an electric power delivery system , comprising:an acquisition circuit in communication with a distribution branch of the electric power delivery system for obtaining current signals therefrom and producing current quantities;a traveling wave fault detection module in communication with the acquisition circuit configured to detect an in-zone fault using the current quantities, determine a fault condition, and provide a traveling wave fault signal upon detection of the traveling wave; and,a protection module in communication with the traveling wave module configured to signal a distribution circuit breaker to open before a voltage condition resulting from the fault exceeds a rated voltage condition of the distribution circuit breaker.2. A system for protecting an electric power delivery system , comprising:a first circuit breaker for selectively connecting a transformer with a distribution bus;a second circuit breaker for selectively connecting the distribution bus with a distribution branch; an acquisition circuit in communication with the distribution branch for obtaining current signals therefrom and producing current quantities;', 'a traveling wave fault detection module in communication with the acquisition circuit configured to detect an in-zone fault using the current quantities, determine a fault condition, and provide a traveling wave fault signal upon detection of the traveling wave; and,', 'a protection module in ...

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Номер записи: 47
12-02-2015 дата публикации

Delay Compensation for Variable Cable Length

Номер: US20150043697A1
Автор: Achanta Srinivas, Ahsan Hidayatullah
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present application discloses a time distribution device capable of providing a synchronized time signal to a plurality of end devices connected to the time distribution device with cables of various lengths. The time distribution device may receive a time signal, generate a time reference based on the received time signal, compensate the time reference for hardware delay, and overcompensate the time reference for a delay caused by a maximum cable length. Prior to being distributed to various end devices, each being connected with the time distribution device by cables of varying length, this overcompensated time reference may then be delayed by an amount based on the cable length connecting each respective end device such that the arrival of each of the synchronized time references at the various end devices is synchronized. 1. A method comprising:receiving, at a time distribution device, a time signal (e.g., GPS PPS); compensating for a hardware delay of the time distribution device; and', 'overcompensating for a delay caused by a maximum cable length;, 'generating a time reference, based on the time received time signal, to be transmitted to a plurality of end devices, includingfor each end device, adding a delay to the time reference, based on a corresponding cable length, to create a plurality of synchronized time references, wherein the delay for each end device is calculated such that the arrival of the plurality of synchronized time references at the plurality of end devices is synchronized; andtransmitting the plurality of synchronized time references, each to a respective end device of the plurality of end devices.21. The method of , further comprising receiving a length of each of a plurality of cables connecting the plurality of end devices to the time distribution device.3. The method of claim 1 , wherein generating a time reference is performed by a Field-Programmable Gate Array (FPGA).4. The method of claim 3 , wherein adding a delay to the time ...

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Номер записи: 48
18-02-2021 дата публикации

BROKEN CONDUCTOR DETECTION IN A MULTIPLE-PHASE ELECTRIC POWER DELIVERY SYSTEM

Номер: US20210048486A1
Автор: Bell Jordan, Dase Kanchanrao Gangadhar, Fischer Normann, Harmukh Sajal, Hou Daqing
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Disclosed herein are systems for determining a broken conductor condition in a multiple-phase electric power delivery system. It has been observed that broken conductors pose a safety concern when occurring in the presence of people or vulnerable environmental conditions. Broken conductor conditions disclosed herein may be used to detect and trip the phase with the broken conductor, thus reducing or even eliminating the safety risk. Further, a distance to the opening may be determined. 1. A system for detecting an open conductor in a multiple-phase electric power delivery system , comprising: a power system signal input for receiving electric power delivery system signals including the current signals from each phase of the multiple phases;', calculate positive-sequence currents from the current signals;', 'calculate zero-sequence currents from the current signals;', 'calculate negative-sequence currents from the current signals;', 'determine an open conductor condition using the positive-sequence current, zero-sequence current, and negative-sequence current; and,, 'an open conductor element to, calculate a first angle difference between the positive-sequence current and the negative-sequence current;', 'calculate a second angle difference between the positive-sequence current and the zero-sequence current; and,', 'determine the phase that includes the open conductor using the first angle difference and the second angle difference; and,, 'a phase detection element to, 'a protective action module to effect a protective action upon determination of the open conductor condition and the determination of the phase that includes the open conductor, 'an intelligent electronic device (IED) receiving current signals from each of the multiple phases of the electric power delivery system; the IED including2. The system of claim 1 , wherein the open conductor element determines the open conductor condition when a magnitude of the positive-sequence current is within a range of a ...

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Номер записи: 49
03-03-2022 дата публикации

INTEGRATING MEMORY DROPOUT TIMER

Номер: US20220065949A1
Автор: Guzman-Casillas Armando, LaDow Peter S.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

An electronic device includes input circuitry that obtains an input signal. The electronic device includes processing circuitry that has an integrating memory dropout (IMD) timer. The IMD timer generates an extended output signal that is asserted an extended amount of time that varies based at least in part on integration of the received input signal. 1. An electronic device , comprising:input circuitry configured to obtain an input signal; andprocessing circuitry comprising an integrating memory dropout (IMD) timer, wherein the IMD timer is configured to generate an extended signal that is asserted an extended amount of time that varies based at least in part on integration of the input signal.2. The electronic device of claim 1 , wherein the IMD timer is configured to set a dropout time by integrating the input signal over time and set an output of the IMD timer based on expiration of the IMD timer.3. The electronic device of claim 2 , wherein the processing circuitry comprises a clock claim 2 , wherein the processing circuitry is configured to count down from the dropout time when the input signal is unasserted by decrementing a counter via one or more clock cycles of the clock.4. The electronic device of claim 3 , wherein the IMD timer is configured to increase the dropout time when the input signal is asserted.5. The electronic device of claim 3 , wherein the IMD timer is implemented on a single hardware timer on a fabric of a field-programmable gate array (FPGA) in the IED.6. The electronic device of claim 1 , wherein the input signal is a received blocking signal that is asserted to block a protection operation of the IED claim 1 , and wherein the extended signal is an extended blocking signal that is asserted the extended amount of time to cause the electronic device to prevent a protection operation of the IED until expiration of the IMD timer.7. The electronic device of claim 6 , wherein the processing circuitry is configured to:detect presence of a fault ...

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Номер записи: 50
08-05-2014 дата публикации

Recording of Operating Parameters of an Intelligent Electronic Device

Номер: US20140128999A1
Автор: III Edmund O, Schwartz Ron, Schweitzer, Whitehead David E
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure provides systems and methods for recording operating parameters of an intelligent electronic device (IED). A system may include a parameter acquisition module, a parameter storage module, and a memory management module. The parameter acquisition module may be configured to periodically obtain operating parameters of an IED at a first interval. The first interval may have a first time length to provide a first resolution of operation of the IED. The parameter storage module may be configured to store the operating parameters. The memory management module may be configured to delete, outside a first resolution period, a first portion of the operating parameters while maintaining a second portion of the operating parameters. The second portion may include operating parameters for each of a second interval. The second interval may have a second time length to provide a reduced second resolution of the operation of the IED. 1. A system for recording operating parameters of an intelligent electronic device (IED) comprising:an IED operating within a electric power delivery system; and a parameter acquisition module configured to periodically obtain operating parameters of an IED at a first interval having a first time length to provide a first resolution of operation of the IED;', 'a parameter storage module configured to store the operating parameters; and', 'a memory management module configured to delete, outside a first resolution period, a first portion of the operating parameters while maintaining a second portion of the operating parameters, wherein the second portion comprises operating parameters for each second interval having a second time length to provide a reduced second resolution of the operation of the IED., 'a record module comprising2. The system of claim 1 , wherein the parameter storage module is configured to store the operating parameters on independent memory.3. The system of claim 1 , wherein the record module is integrated ...

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Номер записи: 51
25-02-2021 дата публикации

WIRELESS CURRENT SENSOR

Номер: US20210055332A1
Автор: Achanta Shankar V., Mobley James, Rice Raymond W., Rowland Benjamin T.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure pertains to systems and methods for measuring electrical parameters in an electric power system. In one embodiment, a system may include a line-mounted wireless current sensor comprising a current monitoring subsystem to generate a current measurement of an alternating current flow through an electrical conductor. The line-mounted wireless current sensor may harvest power from the electrical conductor. A processing subsystem may generate a message comprising the current measurement, and the message may be transmitted at a synchronization point using a wireless communication subsystem. An intelligent electronic device (IED) may receive the message. The IED may further generate a voltage and generate a phasor based on the current measurement and the voltage measurement. A control action subsystem may implement a control action (e.g., selectively connecting or disconnecting a capacitor bank) based on the phasor. 1. A system to calculate a phasor in an electrical power system , the system comprising: a current monitoring subsystem to generate a current measurement of an alternating current flow through an electrical conductor;', 'a power harvesting subsystem to harvest power from the electrical conductor;', 'a first processing subsystem to generate a message comprising the current measurement;', 'a first timing subsystem to determine a synchronization point at which to transmit the message; and', 'a first wireless communication subsystem to transmit the message at the synchronization point; and, 'a line-mounted wireless current sensor, comprising a voltage monitoring subsystem to generate a voltage measurement of the alternating current flow through the electrical conductor;', 'a second wireless communication subsystem to receive the message;', 'a second processing subsystem to generate a phasor based on the current measurement and the voltage measurement;', 'a monitored equipment subsystem to interface with monitored equipment in the electric ...

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Номер записи: 52
25-02-2021 дата публикации

INCORPORATING A WIRELESS CURRENT SENSOR INTO EXISTING ELECTRICAL POWER SYSTEMS

Номер: US20210055333A1
Автор: Mobley James, Rice Raymond W.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure pertains to systems and methods for retrofitting data collection systems in an electrical power system. In one embodiment, a retrofit system includes a wireless current sensor. The wireless current sensor includes a current monitoring subsystem to generate a digitized representation of a current measurement of an alternating current signal in an electrical conductor, a power harvesting subsystem to harvest power from the electrical conductor, and a first wireless communication subsystem to transmit the digitized representation of the current measurement. An analog-to-digital converter includes at least one analog input in electrical communication with a voltage signal associated with the electrical conductor and a digital output to generate a digitized representation of the voltage signal. An intelligent electronic device in communication with a second wireless communication subsystem and the ADC may provide the digitized representations to a main processor. 1. A retrofit system to update a data collection system in an electrical power system , the retrofit system comprising: a current monitoring subsystem to generate a digitized representation of a current measurement of an alternating current signal in an electrical conductor;', 'a power harvesting subsystem to harvest power from the electrical conductor; and', 'a first wireless communication subsystem to transmit the digitized representation of the current measurement;, 'a line-mounted wireless current sensor, comprising at least one analog input in electrical communication with a voltage signal associated with the electrical conductor; and', 'a digital output to generate a digitized representation of the at least one voltage signal;, 'an analog to digital converter (ADC), comprisinga second wireless communication subsystem to receive the digitized representation of the current measurement; andan intelligent electronic device (IED) in electrical communication with the second wireless ...

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Номер записи: 53
03-03-2022 дата публикации

ELECTRIC POWER SYSTEM DIFFERENTIAL PROTECTION WITH DC COMPENSATION

Номер: US20220069566A1
Автор: Di Tomasso Andrea, Donolo Marcos A., Hartshorn Jay, Korkmaz Yusuf Zafer
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Differential protection of electric power delivery system equipment using a compensated operating signal under spurious conditions is disclosed herein. Current transformers (CTs) may provide spurious current signals under certain operating conditions resulting in unintended operation of differential protection. The present disclosure uses a compensated operating signal during such conditions. The compensated operating signal is calculated using operate current and a difference between direct current content of currents obtained from the CTs. Switching between use of the operate current and the compensated operating signal is based on a comparison of the average direct current content of the CTs and a threshold.

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Номер записи: 54
03-03-2022 дата публикации

MEDIA ACCESS CONTROL SECURITY (MACSEC) APPLICATION CRYPTOGRAPHIC FINGERPRINTING

Номер: US20220069618A1
Автор: Gordon Colin, Raghupathula Sai Krishna
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

An intelligent electronic device (IED) includes memory and a processor operatively coupled to the memory. The processor is configured to establish, over a communication network of a power system, a connection association (CA) with a receiving device using a MACsec Key Agreement (MKA). The processor is configured to automatically send an announce message indicating a set of enabled application protocols on the IED to the receiving device. 1. An intelligent electronic device (IED) , comprising:a memory; and obtain power system data from a power system; and', 'generate a frame comprising a port identifier associated with an application protocol of a network stack of a communication network of the power system to allow a receiving device on the communication network to identify the application protocol of the frame., 'a processor operatively coupled to the memory, wherein the processor is configured to execute instructions stored on the memory to cause operations comprising2. The IED of claim 1 , wherein the processor is configured to cause operations comprising selecting the port identifier associated with the application protocol from a lookup table of port identifiers on the network stack.3. The IED of claim 2 , wherein each application protocol in the lookup table has a different port identifier.4. The IED of claim 1 , wherein a protocol suite of the network stack comprises a set of application protocols associated with the same port identifier.5. The IED of claim 1 , wherein the power system data comprises a voltage measurement claim 1 , a current measurement claim 1 , a circuit breaker status claim 1 , a circuit breaker command claim 1 , or any combination thereof.6. The IED of claim 1 , wherein the application protocol of the network stack comprises Distributed Network Protocol (DNP) claim 1 , Multimedia Messaging Services (MMS) claim 1 , Modbus claim 1 , Transmission Control Protocol (TCP) claim 1 , Telnet claim 1 , Generic Object-Oriented Substation Event ( ...

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Номер записи: 55
03-03-2022 дата публикации

Media access control security (macsec) application cryptographic fingerprinting

Номер: US20220069619A1
Автор: Colin Gordon, Jason A. Dearien, Sai Krishna Raghupathula
Принадлежит: Schweitzer Engineering Laboratories Inc

A software defined network (SDN) switch of a communication network includes a memory and a processor operatively coupled to the memory. The SDN switch receives a media access control security (MACsec) frame of power system data. The SDN switch detects an SDN flow match based at least in part on a port identifier of the MACsec frame. The SDN switch performs an action based on the SDN flow match.

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Номер записи: 56
03-03-2022 дата публикации

SYSTEMS AND METHODS FOR ESTABLISHING SECURE COMMUNICATION IN AN ELECTRIC POWER DISTRIBUTION SYSTEM

Номер: US20220070155A1
Автор: Gordon Colin, Knapek John W.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

A system includes an intelligent electronic device (IED) configured to perform operations that include receiving a first user input and deriving a first connectivity association key (CAK) based on the first user input. The system also includes a gateway configured to perform operations that include receiving a second user input, deriving a second CAK based on the second user input, identifying the first CAK of the IED, establishing an adoption link with the IED based on a match between the first CAK and the second CAK, generating a third CAK, and distributing a copy of the third CAK to the IED via the adoption link to establish a MKA connectivity association with the IED.

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Номер записи: 57
25-02-2021 дата публикации

INTEGRATION OF PRIMARY PROTECTION RELAYS FOR ELECTRIC POWER DELIVERY SYSTEMS

Номер: US20210057901A1
Автор: Gubba Ravikumar Krishnanjan, III Edmund O., Schweitzer, Wade Austin Edward, Whitehead David E.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Systems and methods for facilitating selected communications among primary protection relays using a supervisory system with a configurable input/output (IO) map. Primary protection relays may obtain signals from equipment associated with an electric power delivery system and provide primary protection without need for communication. The primary protection relays may communicate a unique identifier as well as signal values, states, and commands to the supervisory system. The supervisory system may route specifically identified communications among primary protection relays in accordance with a configurable IO map by transmitting selected portions of the communications on a port associated with the receiving primary protection relay. The primary protection relays may perform secondary protection and other operations using the communicated information. 1. A system to integrate communications among a first primary protection relay and a second primary protection relay in an electric power delivery system , comprising: a monitored equipment interface to receive an electric power delivery system signal value and to transmit a protective action to a piece of monitored equipment;', 'a protection subsystem to receive the electric power delivery system signal value from the monitored equipment interface and to implement a protective action when the value is outside of a predetermined operating parameter; and', 'a communication subsystem to communicate the electric power delivery system signal values and the protective action;, 'a first primary protection relay and a second primary protection relay to provide primary protection to the electric power delivery system, each of the first primary protection relay and the second primary protection relay comprising a communication switch subsystem comprising a first communication port in communication with the first primary protection relay and a second communication port in communication with the second primary protection relay; ...

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Номер записи: 58
04-03-2021 дата публикации

CURRENT-BASED DIRECTIONAL ELEMENT IN A POWER DELIVERY SYSTEM

Номер: US20210063460A1
Автор: Dase Kanchanrao Gangadhar, Pithapur Mohammed Shabbir
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Systems and methods may be used to determine fault types and/or directions even during a loss of potential by receiving, at one or more processors, an indication of a pre-fault power flow direction for a power delivery system. The one or more processors then determine a fault direction during a fault for the power delivery system using current vector angles and the pre-fault power flow direction. 1. A method , comprising:receiving, at one or more processors, an indication of a pre-fault power flow direction for a power delivery system at an initial time; anddetermining, via the one or more processors, a fault direction during a fault for the power delivery system using current vector angles and the pre-fault power flow direction.2. The method of claim 1 , wherein receiving the indication of the pre-fault power flow direction comprises receiving an indication of a selection of a direction setting.3. The method of claim 1 , wherein receiving the indication of the pre-fault power flow direction comprises receiving the indication from an energy meter or incomer feeder that indicates the power flow direction at the initial time or from previously obtaining and racking the power flow direction.4. The method of claim 1 , wherein the fault comprises a loss of potential in one or two phases for the power delivery system.5. The method of claim 4 , comprising using a healthy phase voltage to virtually create the one or two phases for the power delivery system.6. The method of claim 5 , wherein determining the fault direction is based at least in part on a phase angle difference between the faulted phase voltage and corresponding phase current for a single-line-to-ground fault or three-phase fault or based at least in part on an angle difference between a faulty phase-to-phase voltage and corresponding phase-to-phase current for faults involving two phases and/or ground.7. The method of claim 1 , comprising determining the fault direction based at least in part on a phase angle ...

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Номер записи: 59
01-03-2018 дата публикации

ELECTRIC MOTOR PROTECTION USING STATOR CURRENT AND VOLTAGE MEASUREMENTS

Номер: US20180062552A1
Автор: Donolo Marcos A., Hartshorn Jay
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Monitoring conditions of an electric motor using stator current and voltage signals from power supplied to the motor is disclosed herein. The stator voltage and current signals may be used to calculate instantaneous power values which may be used to calculate slip. The slip may be used to monitor for a locked rotor condition during startup of the motor. The slip value may be used to provide thermal protection to the electric motor. 1. A method for providing protection and monitoring to a three-phase electric motor using measurements from a stator of the electric motor , comprising:in an intelligent electronic device (“IED”), sampling a plurality of stator currents and voltages to a motor to obtain a plurality of current and voltage values for each of three phases;calculating a composite power from the plurality of current and voltage values;for a first predetermined frequency, calculate a first magnitude of the composite power using a first predetermined number of composite power samples;for a second predetermined frequency, calculate a second magnitude of the composite power using the first predetermined number of composite power samples;determine a maximum magnitude from the first magnitude and the second magnitude;calculate a slip value from the predetermined frequency corresponding with the determined maximum magnitude;determining operating conditions of the electric motor using the calculated slip value; andwhen the operating conditions are outside of predetermined acceptable operating conditions, providing a protection signal to open a circuit breaker to disconnect the electric motor.2. The method of further comprising:for a third predetermined frequency, calculate a third magnitude of the composite power using the first predetermined number of composite power samples; anddetermine the maximum magnitude from the first, second, and third magnitudes.3. The method of claim 1 , further comprising the step of filtering the calculated composite power to remove high- ...

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Номер записи: 60
01-03-2018 дата публикации

LOW-POWER FIBER OPTIC TRANSCEIVER

Номер: US20180062749A1
Автор: Hadley Vince B., Rector David M., Rice Raymond W., Watts Steven
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure pertains to systems and methods for low-power optical transceivers. In one embodiment, a low-power optical transceiver may include a microcontroller and an optical receiver and an optical transmitter in communication with and controlled by the microcontroller. The optical receiver may include a photodetector configured to receive a first optical representation of a first signal to be received and to generate an electrical representation of the first signal. An amplifier may amplify the electrical representation of the first signal, and an output in electrical communication with the amplifier may generate an electrical output. The optical transmitter may include a laser diode configured to generate a second optical representation of a second signal to be transmitted. The microcontroller may be configured to control an output power of the laser diode. 1. A low-power optical transceiver , comprising:a microcontroller; a photodetector configured to receive a first optical representation of a first signal to be received and to generate an electrical representation of the first signal;', 'an amplifier configured to amplify the electrical representation of the first signal;', 'an output in electrical communication with the amplifier and configured to generate an electrical output; and, 'an optical receiver in communication with and controlled by the microcontroller and further comprising a laser diode configured to generate a second optical representation of a second signal to be transmitted;', 'wherein the microcontroller is configured to control an output power of the laser diode., 'an optical transmitter in communication with and controlled by the microcontroller and further comprising2. The low-power optical transceiver of claim 1 , wherein the optical transceiver further comprises a voltage regulator configured to enable operation at a range between 1.2 V and 3.3 V.3. The low-power optical transceiver of claim 1 , further comprising a single- ...

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Номер записи: 61
04-03-2021 дата публикации

GENERATOR ROTOR TURN-TO-TURN FAULT DETECTION USING FRACTIONAL HARMONICS

Номер: US20210067072A1
Автор: Alla Matchyaraju, Chowdhury Ritwik, Finney Dale S., Fischer Normann, Scharlach Rogerio
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Detection and protection against electric power generator rotor turn-to-turn faults, rotor multi-point-to-ground faults, and rotor permanent magnet faults is provided herein. A fractional harmonic signal is used to determine the rotor fault condition. The fractional harmonic signal may be a fractional harmonic magnitude of the circulating current of one phase. The fractional harmonic may be a fractional harmonic magnitude of a neutral voltage. A tripping subsystem may issue a trip command based upon detection of a rotor turn-to-turn fault condition. 1. A device for protecting an electric power generator for generating electrical energy for an electric power delivery system using a stator and a rotor , the device comprising;a sensor component in electrical communication with an instrument transformer of the generator, the sensor component including a current signal output for providing current signals corresponding with the instrument transformer of the generator;a processor; calculate a fractional harmonic of the signal output using the current signals;', 'compare the fractional harmonic to a predetermined threshold;', 'determine a rotor fault condition when the fractional harmonic exceeds the predetermined threshold for a predetermined time; and,', 'determine a protective action when the rotor fault condition is determined; and, an output in communication with the computer-readable storage medium for effecting the determined protective action., 'a computer-readable storage medium in communication with the processor and the sensor component, comprising instructions that when executed by the processor cause the device to2. The device of claim 1 , wherein the instrument transformer is associated with a parallel branch of a single phase of the electric power generator.3. The device of claim 1 , wherein the sensor component is in electrical communication with a plurality of instrument transformers of the generator claim 1 , the sensor current signal output for providing ...

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Номер записи: 62
27-02-2020 дата публикации

ACCURATE FAULT LOCATION METHOD BASED ON LOCAL MEASUREMENTS AND REMOTE CURRENTS

Номер: US20200064391A1
Автор: Dase Kanchanrao Gangadhar
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure relates to a computationally efficient technique for determining a location of a fault on a power line using local measurements and remote current measurements. For example, a method may include receiving one or more local measurements of a power line. The method includes receiving a signal indicating one or more remote current measurements of the power line. The method includes determining a location of a fault on the power line based on a fault voltage multiplied by a conjugate of a compensated differential current. The method includes providing the location of the fault. 1. An intelligent electronic device (IED) configured to communicate with at least one other IED , comprising:current sensor circuitry configured to receive one or more signals representative of current of the power line at the IED;voltage sensor circuitry configured to receive one or more signals indicative of a voltage of the power line at the IED;communication circuitry configured to receive one or more signals representative of one or more remote current measurements on the power line from the at least one other IED;a memory; and receive local measurements comprising one or more local current measurements from the current sensor circuitry and one or more local voltage measurements from the voltage sensor circuitry;', 'determine, from the local measurements and the one or more remote current measurements, a location of a fault on the power line based at least in part on a fault voltage multiplied by a conjugate of a compensated differential current; and', 'provide an indication of the location of the fault., 'a processor operatively coupled to a memory, wherein the processor is configured to execute instructions stored in the memory to cause the processor to2. The IED of claim 1 , wherein the compensated differential current comprises a compensated negative sequence differential current or a compensated positive sequence differential current.3. The IED of claim 1 , ...

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Номер записи: 63
27-02-2020 дата публикации

Accurate fault location method based on local and remote voltages and currents

Номер: US20200064392A1
Автор: Kanchanrao Gangadhar Dase
Принадлежит: Schweitzer Engineering Laboratories Inc

The present disclosure relates to a computationally efficient technique for determining a location of a fault on a power line. The technique includes determining an approximate location of the fault based at least in part on a local current measurement and a local voltage measurement from a local relay and a remote current measurement and a remote voltage measurement from a remote relay. The technique includes determining a corrected location of the fault based on the approximate fault location and a correction factor, wherein the correction factor is based on a propagation constant of the power line.

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Номер записи: 64
27-02-2020 дата публикации

SENSITIVE DIRECTIONAL ELEMENT FOR GENERATOR PROTECTION

Номер: US20200067445A1
Автор: Chowdhury Ritwik, Finney Dale S.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Disclosed are systems and methods to determine a direction to a fault of an electrical generator using sensitive current. A ground fault is determined using voltage signals from the generator installation. Incremental residual values of the sensitive current, along with the voltage, are used to determine a direction to the fault. The generator may be high-impedance grounded. The systems and methods further indicate the direction to a fault where multiple generators are connected using a common generation bus. 1. A system for protecting an electric power generation installation in an electric power delivery system , comprising: a first voltage sensor component in electrical communication with a potential transformer of the electric power delivery system, obtaining a voltage signal corresponding with a voltage of the first generator;', 'a first sensitive current sensor component in electrical communication with a current transformer, obtaining a sensitive current signal of the first generator;', 'a first processor;', detect a ground fault of the generator installation using voltage signals from the voltage sensor component;', 'calculate sensitive current values of the first generator using the sensitive current signal, and store the sensitive current values;', calculate an incremental residual current of the first generator as a difference between a present sensitive current value and a previous sensitive current values from the stored sensitive current values of the first generator;', 'calculate an admittance of the first generator using the incremental residual current of the first generator; and,', 'determine a direction to the fault as forward to the first generator by comparing the admittance of the first generator against a forward admittance threshold; and, 'when the ground fault is detected,'}], 'a first computer-readable storage medium in communication with the processor, the first voltage sensor component, and the sensitive current sensor component, ...

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Номер записи: 65
05-06-2014 дата публикации

CONFIGURABLE PROCESS CONTROL DEVICE WITH ELECTRONIC DISPLAY ASSEMBLY

Номер: US20140151587A1
Автор: LaFountain Robert Lynn
Принадлежит: General Equipment and Manufacturing Company, Inc., d/b/a TopWorx, Inc.

A configurable process control device, which includes a field device, such as a valve position controller, that can be configured by a user to emulate any one of a plurality of different types of process control devices, is provided with an electronic display assembly. The electronic display assembly is operatively connected with a control circuit that is arranged to respond to the specific configuration of the field device to cause the electronic display assembly to display information relevant to the specific type of control device the field device has been configured to emulate. The information may include safety certification information specific to each of the different types of process control devices that the field device can be configured to emulate. 1. A configurable process control device for use in a plurality of use environments , wherein at least one of a pre-defined plurality of certifications must be displayed in conjunction with the configurable process control device depending on which of the use environments the configurable process control device is to be used in , the configurable process control device comprising:a field device;a first control circuit operatively coupled to the field device, the first control circuit arranged to control the field device and arranged to be reconfigured by a user to allow the field device to selectively emulate any of a plurality of different process control device types;an electronic display assembly, the electronic display assembly arranged to selectively display different information; anda second control circuit, the second control circuit operatively coupled to the electronic display assembly and the first control circuit, the second control circuit having access to a plurality of different certification information sets, each certification information set corresponding to a different one of the plurality of different process control device types;wherein the second control circuit causes the electronic display ...

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Номер записи: 66
17-03-2016 дата публикации

Fault detection in electric power delivery systems using underreach, directional, and traveling wave elements

Номер: US20160077150A1
Автор: Armando Guzman-Casillas, Bogdan Z. Kasztenny, David E. Whitehead, Edmund O. Schweitzer, Iii, Mangapathirao Venkata Mynam, Veselin Skendzic
Принадлежит: Schweitzer Engineering Laboratories Inc

The present disclosure pertains to systems and methods for detecting faults in an electric power delivery system. In one embodiment, system may include a data acquisition subsystem configured to receive a plurality of representations of electrical conditions. The system may also include an incremental quantities subsystem configured to calculate an incremental current quantity and an incremental voltage quantity based on the plurality of representations. A fault detection subsystem may be configured to determine a fault type based on the incremental current quantity and the incremental voltage quantity, to select an applicable loop quantity, and to declare a fault based on the applicable loop quantity, the incremental voltage quantity, and the incremental current quantity. A protective action subsystem may implement a protective action based on the declaration of the fault.

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Номер записи: 67
05-03-2020 дата публикации

DETECTION OF LOW-ENERGY EVENTS IN AN ELECTRIC POWER SYSTEM

Номер: US20200072904A1
Автор: Guzman-Casillas Armando, III Edmund O., Kasztenny Bogdan Z., Mynam Mangapathirao Venkata, Schweitzer, Skendzic Veselin
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure relates to determining locations of low-energy events on power lines. For example, an IED may receiving an input signal indicating a local electrical condition of a power line. The IED may detect traveling waves on the power line based on the local electrical condition. The IED may detect traveling waves on the power line based on the local and remote electrical conditions. The IED may determine that the traveling waves are associated with a low-energy event. The IED may determine the location of the low-energy event on the power line based at least in part on the traveling waves. 1. A method , comprising:receiving, via an intelligent electronic device (IED), an input signal indicating a local electrical condition of a power line;detecting, via the IED, traveling waves caused by an event, wherein the traveling waves are detected based at least in part on the local electrical condition of the power line;identifying, via the IED, the event as a low-energy event based at least in part on the event not being associated with a fault on the power line; andgenerating, via the IED, a location of the low-energy event on the power line based at least in part on the traveling waves.2. The method of claim 1 , wherein the traveling waves comprise a local traveling wave detected from monitoring the local electrical condition and a remote traveling wave detected from monitoring a remote electrical condition claim 1 , wherein the method comprises:receiving a communication signal indicating a remote electrical condition of the power line measured from another IED; anddetermining the location of the low-energy event on the power line based at least in part on a difference between a time at which the IED detected the local traveling wave from monitoring the local electrical condition and a time at which the other IED received a remote traveling wave from monitoring the remote electrical condition.3. The method of claim 1 , comprising:determining, from a table of ...

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Номер записи: 68
15-03-2018 дата публикации

SYSTEMS AND METHODS FOR MOTOR SLIP CALCULATION USING SHAFT-MOUNTED SENSORS

Номер: US20180076753A1
Автор: Donolo Marcos A.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Systems and methods are disclosed herein for monitoring and detecting a loss of synchronism in an electric motor, such as a synchronous motor. A monitoring system may compare a measured or provided electric power system frequency with a measured rotational frequency of the rotor of the electric motor. The rotational frequency of the rotor may be obtained from a shaft-mounted device. The monitoring system may determine a slip condition and/or a loss of synchronism of the electric motor. 1. A system for monitoring loss of synchronism of an electric motor , comprising:a rotor monitoring device to obtain rotational information of a rotor of a motor;a frequency measurement device to measure a frequency value of power driving the motor; and receive the rotational information from the rotor monitoring device;', 'receive the frequency value of the power driving the motor;', {'sub': 's', 'determine a motor synchronous speed, ω, based on the frequency value;'}, {'sub': 'ar', 'calculate a pole-adjusted rotor speed value, ω, based on a number of poles in the motor;'}, {'sub': s', 'ar, 'calculate a relative speed, Δω, between the rotor and a rotating magnetic field of the motor, based on a difference between the motor synchronous speed, ω, and the pole-adjusted rotor speed value, ω;'}, 'determine a number of poles slipped (NPS) value based on a function of the relative speed, Δω; and', 'detect that a pole has slipped when the NPS value is outside of a threshold range., 'an intelligent electronic device (IED) to2. The system of claim 1 , further comprising a shaft-mounted sensor to communicate the rotational information of the rotor of the motor to the rotor monitoring device.3. A system for monitoring loss of synchronism of an electric motor claim 1 , comprising:a sensor to communicate rotational information of a rotor of a motor, wherein the sensor is physically mounted proximate the rotor of the motor;a rotor monitoring device to obtain the rotational information communicated ...

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Номер записи: 69
05-03-2020 дата публикации

GENERATOR LOSS-OF-FIELD PROTECTION

Номер: US20200076338A1
Автор: Alla Matchyaraju, Finney Dale S., Fischer Normann, Guzman-Casillas Armando
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Protection devices prevent damage to synchronous generators during loss-of-field events. In various embodiments, a first protective element is associated with a first protection zone to protect a generator from a loss-of-field event at full load. A second protective element is associated with a second protection zone to prevent thermal overload during underexcited operation of the generator and to protect from loss-of-filed at light load. A third protective element associated with a third protection zone limits operation of the generator within the generator's specific steady-state stability limits. A fourth protective element is associated with a fourth protection zone to provide an alarm prior to operation of the second protective element. In various embodiments, characteristics and limits of each of the protective elements are defined in the same plane (specifically, the P-Q plane) to simplify settings and allow for visualization of the element characteristics and the generator capability curve at one or more temperatures or cooling capacities. 1. A system to provide loss-of-field protection for a synchronous generator , comprising:a first protective element associated with a first zone of protection in the P-Q plane to prevent damage to the generator from a loss-of-field event at full load;a second protective element associated with a second zone of protection in the P-Q plane;a third protective element associated with a third zone of protection in the P-Q plane to limit operation of the generator to within a steady-state stability limit of the generator; anda fourth protective element associated with a fourth zone of protection in the P-Q plane to provide an alarm prior to implementation of the second protective element.2. The system of claim 1 , wherein the second protective element associated with the second zone of protection in the P-Q plane is configured to trigger thermal overload during underexcited operation of the generator.3. The system of claim 1 , ...

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Номер записи: 70
14-03-2019 дата публикации

CIRCUIT BREAKER HEALTH MONITORING

Номер: US20190079134A1
Автор: Donolo Marcos A., Manson Scott M.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Monitoring a health status of a current interruption device, such as a circuit breaker, is disclosed herein. For example, a device for monitoring a current interruption device may include a processor and a memory. The processor may execute instructions stored in the memory to cause the processor to monitor one or more current measurements of current from an electrical conductor that delivers electrical energy to a load. The processor may provide a signal indicating a health status of the current interruption device based at least in part on the one or more current measurements. 1. A monitoring device , comprising:a memory; monitor one or more current measurements from current on an electrical conductor that delivers electrical energy to a load;', 'determine a health status of a current interruption device based at least in part on the one or more current measurements; and', 'provide a signal indicating the health status of the current interruption device., 'a processor communicatively coupled to the memory, wherein the processor is configured to execute instructions stored in the memory to cause the processor to2. The monitoring device of claim 1 , wherein the processor is configured to execute instructions stored in the memory to cause the processor to determine a maximum current of a three-phase power delivery system in determining the health status.3. The monitoring device of claim 1 , wherein the processor is configured to execute instructions stored in the memory to cause the processor to determine that the current interruption device is not healthy based at least in part on a comparison between the one or more current measurements and either a maximum measurable current multiplied by a factor or a minimum current interruption device damage current.4. The monitoring device of claim 1 , comprising a current transformer claim 1 , wherein the processor is configured to execute instructions stored in the memory to cause the processor to provide the signal ...

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Номер записи: 71
18-03-2021 дата публикации

Bidirectional capacitor bank control

Номер: US20210083478A1
Автор: Kei Hao, Mark W. Feltis, Naresh Malla
Принадлежит: Schweitzer Engineering Laboratories Inc

The present disclosure relates to controlling a capacitor bank using current measurements from different current sensors depending on the power flow direction. For example, the system may perform capacitor bank control operations using current measurements from a first current sensor coupled to the power line between an initial source and the capacitor bank when power is flowing in a first power flow direction on the power line. The system may determine that power flow on the power line has changed from flowing in the first power flow direction to flowing in a second power flow direction from an updated source, different from the initial source. The system may, upon detecting the change in the power flow direction perform control operations of the capacitor bank using current measurements from a second current sensor between an updated source and the capacitor bank.

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Номер записи: 72
23-03-2017 дата публикации

TIME-DOMAIN DIRECTIONAL LINE PROTECTION OF ELECTRIC POWER DELIVERY SYSTEMS

Номер: US20170082675A1
Автор: Guzman-Casillas Armando, III Edmund O., Kasztenny Bogdan Z., Mynam Mangapathirao Venkata, Schweitzer, Skendzic Veselin, Whitehead David E.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure relates to detection of faults in an electric power system. In one embodiment, an incremental quantities subsystem is configured to determine a forward torque, an operating torque, and a reverse torque based on the plurality of time-domain representations of electrical conditions. Each of the forward torque, the operating torque, and the reverse torque may be integrated over an interval. A fault detection subsystem may determine an occurrence of the fault based on a comparison of the operating torque to the forward torque and the reverse torque. Further, a direction of the fault may be determined based on the comparison of the forward torque, the operating torque, and the reverse torque. A fault may be declared based on the comparison and the direction. A protective action subsystem may implement a protective action based on the declaration of the fault. 1. A system configured to detect a fault in an electric power delivery system , comprising:a data acquisition subsystem configured to acquire a plurality of time-domain representations of electrical conditions in the electric power delivery system at each of a first terminal and a second terminal; determine a forward torque, an operating torque, and a reverse torque based on the plurality of time-domain representations of electrical conditions;', 'integrate each of the forward torque, the operating torque, and the reverse torque over an interval;, 'an incremental quantities subsystem configured to determine an occurrence of the fault based on a comparison of the operating torque to the forward torque and the reverse torque;', 'determine a direction of the fault based on the comparison of the forward torque, the operating torque, and the reverse torque;', 'declare a fault based on the comparison and the direction; and, 'a fault detection subsystem configured toa protective action subsystem configured to implement a protective action based on the declaration of the fault.2. The system of claim 1 ...

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Номер записи: 73
26-03-2015 дата публикации

Monitoring Synchronization of a Motor Using Stator Current Measurements

Номер: US20150088444A1
Автор: Donolo Marcos A.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Monitoring synchronization of an electric motor using current signals from power supplied to the motor is disclosed herein. The current signals may be used to calculate representative current values which may be used to calculate a rotational frequency of the rotor of the motor. The rotational frequency may be used to determine synchronization, such as slip. Monitoring may be during startup of a synchronous motor in induction mode. Upon reaching a predetermined synchronization threshold, the motor may be configured from induction mode to synchronous mode. 1) A method of monitoring synchronization of a motor using stator currents , comprising:in an intelligent electronic device (“TED”), sampling a plurality of stator currents to the motor to obtain a plurality of current values for each of three phases;calculating root-mean squared current values from the plurality of current values; 'subtracting a DC component to produce representative current values; and,', 'summing the root-mean squared current values;'}calculating an estimate of synchronization using the representative current values.2) The method of claim 1 , wherein the motor comprises one selected from the group consisting of: a synchronous motor; and claim 1 , an induction motor.3) The method of claim 1 , wherein synchronization comprises one selected from the group consisting of: slip; and claim 1 , a ratio of rotational frequency of a rotor of the motor to a nominal frequency of the motor.4) The method of claim 1 , wherein the motor comprises a synchronous motor started in induction mode claim 1 , and the method further comprises:when the estimate of synchronization reaches a threshold, reconfiguring the synchronous motor from induction mode to synchronous mode.5) The method of claim 4 , wherein the reconfiguring comprises:disconnecting a discharge resistor from the rotor field windings; and,connecting a DC power source to the rotor field windings.6) The method of claim 1 , wherein calculating an estimated ...

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Номер записи: 74
22-03-2018 дата публикации

ROUTING OF TRAFFIC IN NETWORK THROUGH AUTOMATICALLY GENERATED AND PHYSICALLY DISTINCT COMMUNICATION PATHS

Номер: US20180083879A1
Автор: Berner Marc Ryan, Buehler David M., Dearien Jason A., Powers Josh, Smith Rhett
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure pertains to systems and methods to identify high-priority traffic within a software defined network (“SDN”) and to route such traffic through physically distinct communication paths. Such routing may help to reduce network congestion faced by high-priority traffic and increase the reliability of transmission of such data. Certain embodiments may further be configured to generate a failover communication path that is physically distinct from a primary communication path. Still further, certain embodiments may be configured to suggest enhancements to a network that may improve a reliability criterion. 1. A system to configure a plurality of traffic flows within a software defined network (SDN) , the system comprising: a first traffic flow between a first host and a second host, and', 'a second traffic flow between a third host and a fourth host;, 'a user-interface subsystem configured to receive from a user a plurality of traffic flows, the plurality of traffic flows comprising at least a first high-priority traffic flow associated with the first traffic flow, and', 'a second high-priority traffic flow associated with the second traffic flow;, 'a priority subsystem configured to receive a priority designation associated with at least a subset of the plurality of traffic flows, the subset comprising at least generate a first specific communication path through the software defined network using a plurality of communication devices corresponding to the first traffic flow;', 'generate a second specific communication path through the software defined network using a plurality of communication devices corresponding to the second traffic flow; and, 'a traffic routing subsystem configured toa reliability subsystem configured to determine enhancements to the software defined network sufficient to cause at least one of the first specific communication path and the second specific communication path to increase reliability to remain operational after loss ...

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Номер записи: 75
31-03-2022 дата публикации

FREQUENCY SENSING SYSTEMS AND METHODS

Номер: US20220099717A1
Автор: Donolo Marcos A., Hartshorn Jay
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Systems and methods may be used to measure a frequency of a power delivery system and/or of a supply signal transmitted to a load. A system may record an input waveform, determine a frequency of the input waveform at a present time based at least in part on the input waveform and a derivative of the input waveform, and control an operation of a power delivery system based at least in part on the determined frequency. 1. A system comprising:a memory device; and [ a first value obtained at a first time;', 'a plurality of previous values obtained at times before the first time;, 'obtaining a plurality of electrical values of an electrical waveform of an electric power delivery system, wherein the plurality of values comprises, 'determining a plurality of computed derivative values of the electrical waveform based on one or more of the plurality of previous values;', 'determining, from a first computed derivative value in the plurality of computed derivative values, a first scaled derivative value that is scaled according to a first time duration between the time at which the first computed derivative value had occurred and the first time in which the first value was obtained;', 'determining a frequency of the electric waveform based at least in part on the first time duration; and', 'causing an operation of the electric power delivery system to be controlled based at least in part on the frequency., 'a processor operatively coupled to the memory device, wherein the processor is configured to execute instructions stored on the memory device to cause operations comprising2. The system of claim 1 , wherein the processor is configured to cause operations comprising determining that the first scaled derivative is substantially equal to the first value of the electrical waveform.5. The system of claim 1 , wherein the processor is configured to cause operations comprising determining changes in magnitude between each of the previous values to determine the plurality of ...

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Номер записи: 76
12-03-2020 дата публикации

CONFIGURATION OF TESTING MODES IN SUBSTATION DEVICES

Номер: US20200081041A1
Автор: Abubakari Hamza, Browne Cody, DeRuwe Gabriel, Dolezilek David J., Rajasekaran Manodev J., Whitesell Tovah, Wyszczelski Karen SJ
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

A single point to modify a behavior of intelligent electronic devices (IEDs) between active and testing modes is disclosed herein. The IED may include a variety of logical nodes, each with a behavior object related to the active or testing mode behavior of the IED. A single testing mode selection point of the IED is used to modify each of the logical nodes to change between active and testing modes. The testing mode selection point may be a logical input. The testing mode selection point may be a physical switch on the IED. 1. A configurable monitoring device of an electric power delivery system substation , the device comprising:an input for receiving electric power delivery system information;a first mode under which the device is configured to monitor an electric power delivery system by obtaining electric power delivery system information, performing a monitoring routine, and effecting a monitoring operation on the electric power delivery system;a second mode under which the device is configured to perform restricted operations due to a modified behavior of logical nodes of the device; and,an output for communicating results of the monitoring routine;a mode selection input configured to specify one of the first mode and the second mode by updating each subject logical node of a plurality of logical nodes of the device with the specified mode upon receipt of instructions to change to the specified mode.2. The configurable monitoring device of claim 1 , wherein the mode selection input comprises a physical input of the configurable monitoring device.3. The configurable monitoring device of claim 2 , wherein the physical input comprises a button.4. The configurable monitoring device of claim 2 , wherein the physical input comprises a toggle switch.5. The configurable monitoring device of claim 1 , wherein the mode selection input comprises a logical input.6. The configurable monitoring device of claim 1 , wherein the mode selection input is further configured to ...

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Номер записи: 77
25-03-2021 дата публикации

MULTI-PHASE SENSING AND CONTROL USING A COMBINATION OF LINE POST SENSORS AND WIRELESS CURRENT SENSORS

Номер: US20210088555A1
Автор: Hao Kei
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure relates to a capacitor bank control system that uses a combination of line post sensors and wireless current sensors for control operations. For example, a capacitor bank controller may include one or more inputs that electrically couple to a line post sensor to allow the capacitor bank controller to obtain line post sensor measurements. The capacitor bank controller may include a transceiver that receives wireless current sensor measurements from first and second wireless current sensors. The capacitor bank controller may include a processor that controls one or more switching devices of a capacitor bank based at least in part on a combination of line post sensor measurements and wireless current sensor measurements. 1. A capacitor bank control system , comprising:a first line post sensor configured to detect current on a first phase of a power line;a first wireless current sensor configured to detect current on a second phase of the power line;a second wireless current sensor configured to detect current on a third phase of the power line; and an input configured to be electrically coupled to the first line post sensor to obtain line post sensor measurements from the first line post sensor;', 'a transceiver configured to receive wireless current sensor measurements from the first wireless current sensor and the second wireless current sensor; and', 'a processor configured to control one or more switching devices of the capacitor bank based at least in part on a combination of the line post sensor measurements and the wireless current sensor measurements., 'a capacitor bank controller (CBC) comprising2. The capacitor bank control system of claim 1 , wherein the first line post sensor comprises a combination sensor that provides the CBC with both current measurements and voltage measurements.3. The capacitor bank control system of claim 2 , comprising:a first voltage sensor configured to detect voltage on the second phase of the power line; ...

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Номер записи: 78
25-03-2021 дата публикации

LINE-POWERED CURRENT MEASUREMENT DEVICE

Номер: US20210088561A1
Автор: Mobley James, Rice Raymond W.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure pertains to a line-powered current measurement system to mount to an electrical conductor and related methods. In one embodiment, a system may comprise a current transformer to electrically couple to an electrical conductor and to generate a secondary current proportional to a primary current in the conductor. A power harvesting subsystem may harvest power from the secondary current in a first configuration. A switching subsystem may transition the line-powered current measurement device between the first configuration and a second configuration, in which a current measurement subsystem generates a measurement of the secondary current. The switching subsystem may provide the secondary current to the power harvesting subsystem in the first configuration and may bypasses the power harvesting subsystem in the second configuration. A communication subsystem may transmit the measurement of the secondary current to a receiver device. 1. A line-powered current measurement system to mount to an electrical conductor , comprising:a current transformer to electrically couple to an electrical conductor in electrical communication with a power source and to generate a secondary current proportional to a primary current generated by the power source;a power harvesting subsystem to harvest power from the secondary current and to power the line-powered current measurement device while the line-powered current measurement device is in a first configuration;a switching subsystem to transition the line-powered current measurement device between the first configuration and a second configuration based on an input;a current measurement subsystem to generate a measurement of the secondary current while the line-powered current measurement device is in a second configuration; anda communication subsystem to transmit the measurement of the secondary current to a receiver device;wherein the secondary current is provided to the power harvesting subsystem in the first ...

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Номер записи: 79
25-03-2021 дата публикации

DETERMINING THE SIZE OF A CAPACITOR BANK

Номер: US20210088595A1
Автор: Hao Kei
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure relates to a capacitor bank controller that automatically determines the size of a capacitor bank. For example, the capacitor bank controller may obtain voltage and current measurements while the capacitor bank is disconnected from the power line. Further, the capacitor bank controller may obtain voltage and current measurements while the capacitor bank is connected to the power line. The capacitor bank controller may determine the size of the capacitor bank based on impedances from the voltage and current measurements while the capacitor bank is connected and disconnected. 1. A capacitor bank controller (CBC) , comprising:memory; and obtain a first voltage measurement and a first current measurement while a capacitor bank is disconnected from a power system;', 'obtain a second voltage measurement and a second current measurement while the capacitor bank is connected to the power system; and', 'automatically determine a size of the capacitor bank based at least in part on the first voltage measurement, the first current measurement, the second voltage measurement, and the second current measurement., 'a processor operatively coupled to the memory, wherein the processor is configured to2. The CBC of claim 1 , wherein the processor is configured to:determine a disconnected impedance while the capacitor bank is disconnected by dividing the first voltage measurement by the first current measurement;determine a connected impedance of the capacitor bank by dividing the second voltage measurement by the second current measurement; anddetermine a capacitor bank impedance of the capacitor bank based on the disconnected impedance and the connected impedance.5. The CBC of claim 1 , wherein the memory comprises a look-up table of standard capacitor bank sizes claim 1 , wherein the processor is configured to select a standard capacitor bank size with a range in which the determined size of the capacitor bank falls within.6. The CBC of claim 5 , wherein the ...

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Номер записи: 80
02-04-2015 дата публикации

PIEZOELECTRIC LOUDSPEAKER

Номер: US20150092963A1
Автор: Cheng Kai-Wen, HO Chung-chun, LIU Yuan-Ping, TSAI Chang-Heng
Принадлежит: Miezo Inc.

The present invention discloses a piezoelectric loudspeaker. The piezoelectric loudspeaker comprises a sound producing plate, a resonant sound-box, a surround and a reflective sound-box. The sound producing plate comprises a piezoelectric ceramic element. The resonant sound-box includes a first opening comprising a first carrying part. The sound producing plate is disposed on the first carrying part. A cavity resonator is formed between the sound producing plate and the resonant sound-box. The surround is disposed between the first carrying part and the sound producing plate. The reflective sound-box includes a second opening and a reflective output opening. The second opening comprises a second carrying part. The resonant sound-box is disposed on the second carrying part. A reflective cavity body is formed between the resonant sound-box and the reflective sound-box, and the reflective cavity body is connected the reflective output opening. 1. A piezoelectric loudspeaker , comprising:a sound producing plate including at least one piezoelectric ceramic element being able to vibrate the sound producing plate;a resonant sound-box including a first opening comprising a first carrying part, the sound producing plate being disposed on the first carrying part, and a cavity resonator being formed between the sound producing plate and the resonant sound-box;a surround disposed between the first carrying part and the sound producing plate; anda reflective sound-box including a second opening and a reflective output opening, a second carrying part formed on a partial of an inner edge of the seconding opening, the resonant sound-box being disposed on the second carrying part, a reflective cavity body being formed between the resonant sound-box and the reflective sound-box, the reflective output opening being disposed on a side of the reflective sound-box, and the reflective cavity body being communicating with the reflective output opening.2. The piezoelectric loudspeaker of ...

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Номер записи: 81
29-03-2018 дата публикации

SYSTEMS AND METHODS FOR ROUTING SAMPLED VALUES UPON LOSS OF PRIMARY MEASUREMENT EQUIPMENT

Номер: US20180089057A1
Автор: Fischer Normann, Yang Qiaoyin
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Systems and Methods are disclosed for providing measurement data redundancy to intelligent electronic devices (IEDs) in an electric power system, without additional redundant components. In various embodiments, a first measurement device obtains measurement data from a first portion of the electric power delivery system. A second measurement device obtains measurement data from a second portion of the electric power delivery system. A first IED monitors the first portion of the electric power delivery system based on measurement data associated with the first portion of the electric power delivery system, and a second IED monitors the second portion of the electric power delivery system based on measurement data associated with the second portion of the electric power delivery system. Assuming the first and second portions are coordinated, a communication system dynamically routes measurement data from the second measurement device to the first IED upon a failure of receiving digital measurements from the first measurement device. 1. A communication system for dynamically routing power system signals to intelligent electronic devices (IEDs) , comprising:a first communication port to receive power system signals corresponding to measurements made by a first measurement device within a first portion of an electric power delivery system;a second communication port to output the power system signals from the first measurement device to a first IED configured to monitor the first portion of the electric power delivery system using received power system signals;a third communication port to receive power system signals corresponding to measurements made by a second measurement device within a second portion of the electric power delivery system;a fourth communication port to output the power systems signals from the second measurement device to a second IED configured to monitor the second portion of the electric power delivery system using received power system signals;a ...

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Номер записи: 82
25-03-2021 дата публикации

BROKEN CONDUCTOR DETECTOR

Номер: US20210091559A1
Автор: Achanta Shankar V., Mobley James, Rice Raymond W.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure pertains to detection of a broken conductor in an electric power system. In one embodiment, a broken conductor detector may be configured to be mounted to an electrical conductor and may comprise a communication subsystem configured to transmit a signal configured to indicate that the conductor is broken. A sensor may determine a plurality of vectors. A processing subsystem may be configured to receive the plurality of vectors from the sensor and to identify when the vector is outside of a range defined by a threshold value. The processing subsystem may determine that the conductor is falling based on the plurality of vectors remaining outside of the threshold for a period of time determined by the timer subsystem. A signal may be transmitted by the communication subsystem to indicate that the conductor is falling. 1. A system configured to detect a falling conductor in an electric power system , the system comprising: [ a first orientation in three axes of the broken conductor detector at a first time; and', 'a second orientation in three axes of the broken conductor detector at a second time;, 'an orientation subsystem to determine, receive the first orientation in three axes and the second orientation in three axes;', 'determine an acceleration in at least one axis of the three axes based on the first orientation and the second orientation;', 'determine that the acceleration exceeds a threshold; and', 'generate a signal based on the acceleration exceeding the threshold; and, 'a processing subsystem in communication with the sensor, the processing subsystem to, 'a broken conductor detector communication subsystem to transmit the signal; and, 'a broken conductor detector to couple to an electrical conductor, comprising an IED communication subsystem configured to receive the signal; and', 'a protective action subsystem configured to issue a command to interrupt the flow of electric power through the conductor based on the signal., 'an ...

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Номер записи: 83
05-05-2022 дата публикации

SYSTEMS AND METHODS FOR ESTABLISHING SECURE COMMUNICATION IN AN ELECTRIC POWER DISTRIBUTION SYSTEM WITH SOFTWARE DEFINED NETWORK

Номер: US20220140863A1
Автор: Gordon Colin, Skelton Duane C.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

A system includes a switch of an electric power distribution system, the switch being configured to receive data and to transmit data, and the system includes a controller configured to communicatively couple to the switch. The controller is configured to create a software defined network by instructing the switch to transmit data to a location, and the controller is configured to generate a set of keys and to provide the set of keys to the switch to enable the switch to communicate data via a Media Access Security (MACsec) communication link, a MACsec key agreement (MKA) connectivity association, or both.

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Номер записи: 84
19-03-2020 дата публикации

DISTANCE PROTECTION OF ELECTRIC POWER DELIVERY SYSTEMS USING TIME DOMAIN AND FREQUENCY DOMAIN

Номер: US20200088780A1
Автор: Daniels Chadburn Troy, Kasztenny Bogdan Z., Mynam Mangapathirao Venkata
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Distance protection of electric power delivery systems are disclosed herein where a fault within a zone of protection is detected using time-domain fault detection supervised by frequency-domain fault detection. The distance fault detection may be asserted when the real or imaginary parts of the time-domain operating and polarizing quantities are both positive or both negative and an angle between the frequency domain operating and polarizing quantities is within a predetermined range. Additional security may be provided using a level check, a sign consistency check, or a disturbance detector. 1. A system to determine a fault within a zone of protection of an electric power delivery system , comprising:a signal processor to calculate a frequency-domain operating quantity, and a frequency-domain polarizing quantity; compare the frequency-domain operating quantity and the frequency-domain polarizing quantity; and', 'when the frequency-domain operating quantity and frequency-domain polarizing quantity are within a predetermined range of each other, assert a frequency-domain fault detection signal;, 'a frequency-domain distance fault detector to calculate a time-domain operating quantity;', 'calculate a time-domain polarizing quantity;', 'determine a coincidence time that signs of the time-domain operating and polarizing quantities are the same;', 'when the coincidence time reaches a predetermined coincidence time threshold, assert a time-domain fault detection signal; and,', 'assert a distance fault detection signal when the frequency-domain fault detection signal is asserted and the time-domain fault detection signal is asserted; and,, 'a time-domain distance fault detector toa monitored equipment interface in communication with the electric power delivery system to effect a protective action in the electric power delivery system upon assertion of the distance fault detection signal.4. The system of claim 1 , wherein the predetermined range of the frequency-domain ...

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Номер записи: 85
12-05-2022 дата публикации

INTELLIGENT ELECTRONIC DEVICE CONTROL USING WIRELESSLY TRANSMITTED MULTI-PHASE ELECTRICAL MEASUREMENTS

Номер: US20220146557A1
Автор: Hao Kei
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Systems, methods, and devices are provided for controlling part of an electric power distribution system using an intelligent electronic device that may rely on communication from wireless electrical measurement devices. Wireless electrical measurement devices associated with different phases of power on an electric power distribution system may send wireless messages containing electrical measurements for respective phases to an intelligent electronic device. When wireless communication with one of the wireless electrical measurement devices becomes inconsistent or lost, the intelligent electronic device may synthesize the electrical measurements of the missing phase using electrical measurements of remaining phases. The intelligent electronic device may use the synthesized electrical measurements to control part of the electric power distribution system. 1. One or more tangible , non-transitory , computer-readable media comprising instructions that , when executed by a processor of an intelligent electronic device configured to control at least part of an electric power distribution system , cause the processor to: a first wireless electrical measurement device that obtains electrical measurements of a first phase on a first distribution line of the electric power distribution system;', 'a second wireless electrical measurement device that obtains electrical measurements of a second phase on a second distribution line of the electric power distribution system; and', 'a third wireless electrical measurement device that obtains electrical measurements of a third phase on a third distribution line of the electric power distribution system; and, 'operate the intelligent electronic device that comprises the processor according to a first mode when the intelligent electronic device has wireless communication withoperate the intelligent electronic device according to a second mode when the intelligent electronic device has lost wireless communication with one of the ...

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Номер записи: 86
28-03-2019 дата публикации

High-fidelity voltage measurement using resistive divider in a capacitance-coupled voltage transformer

Номер: US20190094287A1
Автор: Edmund O. Schweitzer, Iii, Veselin Skendzic
Принадлежит: Schweitzer Engineering Laboratories Inc

The present disclosure pertains to systems and methods for detecting traveling waves in electric power delivery systems. In one embodiment, a system comprises a capacitance-coupled voltage transformer (CCVT) in an electric power delivery system, the CCVT comprising a first capacitor disposed between an electrical bus and a first electrical node, and a second capacitor electrically disposed between the first electrical node and a ground connection. A resistive divider in electrical communication with a first node may generate a resistive divider electrical signal corresponding to a voltage value. An intelligent electronic device (IED) in electrical communication with the resistive divider monitors a resistive divider voltage signal. The IED detects a traveling wave based on the resistive divider voltage signal and a measurement of a primary current through an electrical bus in electrical communication with the CCVT; and analyzes the traveling wave to detect a fault on the electric power delivery system.

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Номер записи: 87
28-03-2019 дата публикации

ACCURACY OF EVENT LOCATING ON POWERLINES BASED ON FIELD DATA

Номер: US20190094288A1
Автор: III Edmund O., Schweitzer
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

An intelligent electronic device (IED) may detect arrival times and/or other characteristics of traveling waves and/or reflections thereof to determine a distance to a fault location in terms of per-unit length. An IED may convert between line distances, line-of-sight distances, straight-line distances, and/or terrain-based distances. An IED may refine one or more physical line parameters used for traveling wave-based location calculations for iterative improvements in accuracy. For instance, an IED may compare reported distances to fault locations with field-verified, confirmed fault locations to refine physical line parameters used in future location calculations. Similarly, an IED may identify which of a plurality of towers corresponds to a fault location based on a mapping of towers on a per-unit scale. Confirmed fault locations may be used to update or refine the mapping to improve future tower identification relative to per-unit fault location. 1. An auto-calibrating fault detection system , comprising:a datastore to store at least one physical parameter of a powerline; arrival times of traveling waves from the detected fault, and', 'the at least one stored physical parameter of the powerline;, 'a traveling wave-based fault detection system to calculate fault location information based, at least in part, ona reporting system to generate a fault location report based on the calculated fault location information; and receive a confirmed location of the fault, and', 'adjust the stored physical parameter based on a difference between the calculated location of the fault and the confirmed location of the fault., 'a calibration subsystem to'}2. The system of claim 1 , wherein the at least one physical parameter of the powerline comprises a line length parameter (L parameter).3. The system of claim 1 , wherein the at least one physical parameter of the powerline comprises a traveling wave line propagation time parameter (T-parameter).4. The system of claim 1 , ...

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Номер записи: 88
28-03-2019 дата публикации

DISTANCE PROTECTION USING TRAVELING WAVES IN AN ELECTRIC POWER DELIVERY SYSTEM

Номер: US20190094291A1
Автор: III Edmund O., Kasztenny Bogdan Z., Schweitzer
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure pertains to systems and methods to detect faults in electric power delivery systems. In one embodiment, a data acquisition system may acquire a plurality of electric power delivery system signals from an electric power transmission line. A traveling wave system may detect a traveling wave based on the plurality of electric power delivery system signals received from the data acquisition system. The traveling wave may be analyzed using a first mode to determine a first mode arrival time and using a second mode to determine a second mode arrival time. A time difference between the first mode arrival time and the second mode arrival time may be determined. A fault location system may estimate or confirm a location of the fault based on the time difference. A protection action module may implement a protective action based on the location of the fault. 1. A system to detect a fault in an electric power delivery system , comprising:a data acquisition system to acquire a plurality of electric power delivery system signals from an electric power transmission line; detect a traveling wave based on the plurality of electric power delivery system signals from the data acquisition system;', 'analyze the traveling wave using a first mode to determine a first mode arrival time;', 'analyze the traveling wave using a second mode to determine a second mode arrival time;', 'calculate a time difference between the first mode arrival time and the second mode arrival time;, 'a traveling wave system in communication with the data acquisition system to receive the time difference from the traveling wave system;', 'calculate a location of the fault based on the time difference; and, 'a fault location system in communication with the traveling wave system toa protection action module to implement a protective action based on the location of the fault.2. The system of claim 1 , wherein the first mode arrival time comprises a midpoint in the first mode claim 1 , and ...

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Номер записи: 89
28-03-2019 дата публикации

SECURE TRAVELING WAVE DISTANCE PROTECTION IN AN ELECTRIC POWER DELIVERY SYSTEM

Номер: US20190094292A1
Автор: III Edmund O., Kasztenny Bogdan Z., Schweitzer
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure pertains to systems and methods for monitoring traveling waves in an electric power system. In various embodiments, a data acquisition subsystem may acquire electric power system signals. A traveling wave detection subsystem may detect two or more traveling waves based on the electric power system signals and determine a location of an event triggering the traveling waves. A traveling wave security subsystem may selectively generate a restraining signal based on the location of the event as within a blocking zone. A protection action subsystem may implement a protective action when the location is outside of a blocking zone. In various embodiments, a protective action will not be implemented for traveling waves launched from known locations of switching devices operating normally. Further, protective actions may be restrained if a magnitude of a traveling wave differs from an expected value based on a pre-fault voltage. 1. A system to monitor traveling waves in an electric power system , comprising:a data acquisition subsystem to acquire electric power system signals at a first terminal of the electric power system; analyze the electric power system signals to identify at least two traveling waves; and', 'determine a location of an event triggering the identified traveling waves;, 'a traveling wave detection subsystem to assess a security measure based on the event location; and', 'selectively generate a restraining signal based on the security measure; and, 'a traveling wave security subsystem in communication with the traveling wave detection subsystem to detection of the traveling waves, and', 'absence of the restraining signal., 'a protection action subsystem in communication with the traveling wave detection subsystem and the traveling wave security subsystem to implement a protective action based on2. The system of claim 1 , wherein the security measure comprises a multi-zone protection scheme comprising at least one blocking zone.3. The ...

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Номер записи: 90
28-03-2019 дата публикации

DETECTION OF CROSS-COUNTRY FAULTS

Номер: US20190094845A1
Автор: Fischer Normann, Haes Dennis
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Disclosed herein are a variety of systems and methods related to detection of a cross-country fault in an electrical power system. In one embodiment, a system consistent with the present disclosure may be configured to monitor electrical parameters in the electrical power system. The system may determine when a voltage magnitude of one phase exceeds a first voltage threshold. The one phase that exceeds the first voltage threshold may be identified as an un-faulted phase. The system may further be configured to determine that the voltage magnitude of the un-faulted phase exceeds a second threshold based on a zero-sequence voltage. The system may further be configured to determine that a phase angle between the un-faulted phase and the zero-sequence voltage is within a range. A protective action to clear the cross-country fault condition may be implemented upon identification of a cross-country fault. 1. A system configured to detect a cross-country fault in an electric power system , comprising:a data acquisition subsystem configured to receive a plurality of representations of electrical conditions associated with at least a portion of the electric power system; identify a first condition comprising a voltage magnitude of one phase exceeding a first voltage threshold based on the plurality of representations of electrical conditions;', 'identify the one phase that exceeds the first voltage threshold as an un-faulted phase;', 'identify a second condition comprising the voltage magnitude of the un-faulted phase exceeding a second threshold based on a zero-sequence voltage based on the plurality of representations of electrical conditions;', 'identify a third condition comprising a phase angle between the un-faulted phase and the zero-sequence voltage being within a range based on the plurality of representations of electrical conditions;, 'a magnitude and angle subsystem configured to identify a cross-country fault condition based on identification of the first ...

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Номер записи: 91
28-03-2019 дата публикации

GENERATOR STATOR GROUND PROTECTION USING THIRD HARMONIC

Номер: US20190097417A1
Автор: Chowdhury Ritwik, Finney Dale S.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Detection of electric power generator stator ground fault conditions and protection of the generator due to such conditions is provided herein. In one embodiment, a generator protection element may calculate generator third harmonic voltage quantities using measurements from the generator terminals, and determine a stator ground fault condition using the calculated generator third harmonic voltage quantity. A tripping subsystem may issue a trip command based upon detection of a stator ground fault condition. 1. A system , comprising:a generator configured to generate electrical energy for an electric power delivery system; a generator monitoring subsystem configured to measure terminal voltages and currents of the generator;', 'a stator ground fault detection subsystem in communication with the generator monitoring subsystem and configured to calculate a generator third harmonic voltage using the terminal voltages and currents, calculate a ratio of a generator neutral third harmonic voltage value and the generator third harmonic voltage value, and determine a stator ground fault when the ratio is less than a predetermined threshold;', 'a tripping subsystem configured to issue a trip command based upon satisfaction of the stator ground fault detection; and, 'an intelligent electronic device (IED), comprisingan electrical interrupter configured to selectively interrupt an electrical connection between the generator and the electric power generation and transmission system based on the trip command.2. The system of claim 1 , wherein the stator ground fault detection subsystem is further configured to determine the stator ground fault only when the calculated generator third harmonic voltage exceeds a scaled no-load generator third harmonic voltage.3. The system of claim 1 , wherein the stator ground fault detection subsystem is further configured to determine the stator ground fault only when a disturbance is not detected on the generator.4. The system of claim 1 , ...

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Номер записи: 92
28-03-2019 дата публикации

MULTIPLE GENERATOR GROUND FAULT DETECTION

Номер: US20190097418A1
Автор: Chowdhury Ritwik, Finney Dale S.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Detection and protection against electric power generator stator ground fault conditions in multiple-generator high-impedance grounded installations is provided herein. In one embodiment, a generator protection element may block a determination of a fault using third harmonic voltages when the third harmonic voltage from the generator is less than a factor of the maximum third harmonic voltage from all of the generators on the common bus. A tripping subsystem may issue a trip command based upon detection of a stator ground fault condition. 1. A system , comprising:a generator configured to generate electrical energy for an electric power delivery system, in electrical communication with common bus for providing the electrical energy to the common bus; a generator monitoring subsystem configured to measure a neutral voltage value and a terminal voltage value of the generator;', 'a stator ground fault detection subsystem in communication with the generator monitoring subsystem and configured to determine a stator ground fault using a neutral voltage and terminal voltage value from the generator monitoring subsystem, and to block a determination of the stator ground fault when a factor of the third harmonic voltage from the generator is less than a maximum third harmonic voltage from another generator in electrical communication with the common bus;', 'a tripping subsystem configured to issue a trip command based upon satisfaction of the stator ground fault detection and absence of the block; and,, 'an intelligent electronic device (IED), comprisingan electrical interrupter configured to securely and selectively interrupt an electrical connection between the generator and the electric power generation and transmission system based on the trip command.2. The system of claim 1 , wherein the stator ground fault detection subsystem is further configured to block the determination when a communication channel is faulty.3. The system of claim 1 , wherein the stator ground ...

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Номер записи: 93
26-03-2020 дата публикации

FREQUENCY SENSING SYSTEMS AND METHODS

Номер: US20200096546A1
Автор: Donolo Marcos A., Hartshorn Jay
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Systems and methods may be used to measure a frequency of a power delivery system and/or of a supply signal transmitted to a load. A system may record an input waveform, determine a frequency of the input waveform at a present time based at least in part on the input waveform and a derivative of the input waveform, and control an operation of a power delivery system based at least in part on the determined frequency. 1. A system comprising:sensing circuitry configured to periodically sense, at a defined interval, a value of an electrical waveform on a transmission line of an electrical power transmission system; and [ a first value sensed by the sensing circuitry at a first time; and', 'a plurality of previous values sensed by the sensing circuitry at times before the first time;, 'receiving a plurality of values of the electrical waveform sensed by the sensing circuitry, wherein the plurality of values comprises, 'determining a scaled derivative of the electrical waveform based on one or more of the plurality of values of the electrical waveform and a time to the first time;', 'determining a second time corresponding to a time before the first time at which the scaled derivative of the electrical waveform has a value substantially equal to the first value of the electrical waveform; and', 'determining the frequency based at least in part on a time duration between the second time and the first time;, 'processing circuitry configured to determine a frequency of the electrical waveform at least in part bywherein the processing circuitry is configured to cause an operation of the electrical power transmission system to be controlled based at least in part on the frequency.2. The system of claim 1 , wherein the electrical waveform comprises a voltage waveform.3. The system of claim 1 , wherein the electrical waveform comprises a current waveform.4. The system of claim 1 , wherein the processing circuitry is configured to operate a protective device in response to the ...

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Номер записи: 94
26-03-2020 дата публикации

POWER SYSTEM SIMULATION BASED ON SNAPSHOT DATA

Номер: US20200096959A1
Автор: Appannagari Mahipathi Reddy, Armstrong Benjamin E., Gubba Ravikumar Krishnanjan, Manson Scott M.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure relates to systems and methods of simulating a power system using field data. For example, an embodiment may include a processor operatively coupled to a memory. The processor may receive a power system model representative of an actual power system. The processor may receive field data from the actual power system. The processor may initialize the power system model based on the field data to represent a state of the actual power system. The processor may simulate at least one scenario on the power system model. The processor may provide results of simulating the at least one scenario. 1. A simulation system , comprising: receive a power system model representative of an actual power system;', 'receive field data from the actual power system at a snapshot in time;', 'initialize the power system model based on the field data to represent a state of the actual power system at the snapshot in time;', 'simulate at least one scenario on the power system model; and', 'provide results of simulating the at least one scenario., 'a processor operatively coupled to a memory, wherein the processor is configured to2. The simulation system of claim 1 , wherein the processor is configured to receive live field data currently present on the actual power system to represent the current state of the actual power system in the power system model.3. The simulation system of claim 1 , comprising a human-to-machine interface (HMI) configured to display claim 1 , on a display screen of the HMI claim 1 , a plurality of stored snapshots of field data and to receive an input of a selected snapshot from the plurality of stored snapshots claim 1 , wherein the processor is configured to initialize the power system model based on the field data in the selected snapshot.4. The simulation system of claim 1 , wherein the processor is configured to send one or more signals to a display screen of a human-to-machine interface (HMI) to display the results of the at least one ...

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Номер записи: 95
13-04-2017 дата публикации

Electric Power System Monitoring Using High-Frequency Signals

Номер: US20170102426A1
Автор: Cody W. Tews, David E. Whitehead, Edmund O. Schweitzer, Iii, Veselin Skendzic
Принадлежит: Schweitzer Engineering Laboratories Inc

A system for monitoring an electric power delivery system by obtaining high-frequency electric power system measurements and displaying event information is disclosed herein. The system may use the high-frequency electric power system information to detect traveling waves. The system may generate a display showing fault location on the electric power system, and timing of traveling waves received at locations on the electric power system. The display may include time on one axis and location on another axis. The display may include a waterfall display.

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Номер записи: 96
08-04-2021 дата публикации

SPECTRAL ANALYSIS USING WIRELESS CURRENT SENSORS

Номер: US20210102981A1
Автор: Mobley James
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure relates to spectral analysis in wireless current sensors. For example, a wireless current sensor (WCS) includes current transformer windings that harvest electrical energy from a power line and allow the WCS to obtain current measurements of the power line. The WCS includes a processor that obtains the current measurements of the power line via the current transformer windings. The processor generates a frequency domain representation of the current on the power line using the current measurements. The processor sends a wireless signal indicating results from the frequency domain representation to an intelligent electronic device (IED) that monitors the power line to allow the TED to analyze the results for anomalies. 1. A line-powered wireless current sensor (WCS) , comprising:current transformer windings configured to harvest electrical energy from a power line and allow the WCS to obtain current measurements of the power line;memory; and obtain the current measurements of the power line via the current transformer windings;', 'generate a frequency domain representation of the current on the power line using the current measurements; and', 'send a wireless signal indicating results from the frequency domain representation to an intelligent electronic device (IED) that monitors the power line to allow the IED to analyze the results for anomalies., 'a processor operatively coupled to the memory, wherein the processor is configured to2. The WCS of claim 1 , wherein the results comprise the real and imaginary parts of the frequency domain representation.3. The WCS of claim 1 , wherein the processor is configured to perform fast fourier transform (FFT) analysis on the current measurements to obtain the frequency domain representation.4. The WCS of claim 1 , wherein the processor is configured to send harmonic content of the power line to the IED to allow the IED to perform control actions or protection actions based on the harmonic content of the ...

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Номер записи: 97
08-04-2021 дата публикации

WIRELESS NEUTRAL CURRENT SENSOR (WNCS)

Номер: US20210102985A1
Автор: Achanta Shankar V., Hao Kei, Rice Raymond W.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure relates to a wireless neutral current sensor (WNCS) for monitoring a neutral cable of a capacitor bank. The WNCS may include a power storage device that provides power to allow the WNCS to send a test signal to a capacitor bank controller (CBC) of the capacitor bank to confirm operation of the WNCS during commissioning. The WNCS may include processing and communication circuitry that, during operation, detects an electrical characteristic on the neutral cable. The processing and communication circuitry may provide a message indicating the electrical characteristic to the CBC. 1. A wireless neutral current sensor (WNCS) , comprising:a power storage device configured to provide power to allow the WNCS to send a test signal to a capacitor bank controller (CBC) of a capacitor bank to confirm operation of the WNCS during commissioning; and during operation, obtain a current characteristic of a neutral cable of the capacitor bank; and', 'transmit a wireless current message indicating the current characteristic to the CBC., 'processing and communication circuitry configured to2. The WNCS of claim 1 , wherein the processing and communication circuitry is configured to receive power using a combination of power from the neutral cable and the power storage device to allow the WNCS to operate without any electrical conductors connected to the CBC that provide power.3. The WNCS of claim 1 , wherein the power storage device comprises:a replaceable battery configured to power the WNCS to send the test signal to confirm operation of the WNCS during commissioning;CT windings configured to allow the WNCS to be powered using energy from the neutral cable; and receive energy harvested from the neutral cable from the power harvesting circuitry when current flows through the neutral cable; and', 'power the WNCS using the received energy to send the current message., 'a rechargeable battery configured to4. The WNCS of claim 3 , wherein the processing and ...

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Номер записи: 98
04-04-2019 дата публикации

Mitigation of gratuitous conditions on electric power delivery systems

Номер: US20190103762A1
Автор: David J. Dolezilek
Принадлежит: Schweitzer Engineering Laboratories Inc

Mitigation of gratuitous conditions on an electric power delivery system is disclosed herein. Intelligent electronic devices (IEDs) may take actions on the electric power delivery system based on commands received via communications channels and based on detected electrical conditions. When a gratuitous condition (such as a cyber attack) is detected, a block command is provided to the IEDs such that the IEDs do not effect actions corresponding with commands received over a communications system. Communications may pass through a condition monitor of a communications device to detect insecurity and either block the communications or command the IED to enter interlock mode.

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Номер записи: 99
19-04-2018 дата публикации

ELECTRIC POWER SYSTEM MONITORING USING DISTRIBUTED CONDUCTOR-MOUNTED DEVICES

Номер: US20180106851A1
Автор: Achanta Shankar V., III Edmund O., Schweitzer, Whitehead David E.
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

Disclosed herein are systems for monitoring and protecting an electric power system using a plurality of conductor-mounted detectors (CMDs). In one embodiment, a plurality of CMDs are coupled to an electrical conductor. Each CMD may harvest power from the electrical conductor and may monitor electrical current in the conductor. When the electrical current in the conductor exceeds a fault current threshold a fault signal may be transmitted. A receiver in communication with each of the plurality of CMDs may receive the fault signal from at least one of the plurality of CMDs. A protective action may be generated and implemented to clear the fault. A portion of the electric power system affected by the fault may be determined based on identification of each of the plurality of CMDs to transmit the fault signal. 1. A system for monitoring and protecting an electric power delivery system , the system comprising: a power harvesting subsystem configured to harvest power from the electrical conductor;', 'a current monitor subsystem configured to monitor an electrical current in the conductor;', 'a fault detection subsystem configured to determine when the electrical current in the conductor exceeds a fault current threshold; and', 'a transmission subsystem configured to transmit a fault signal upon detection of the fault current threshold;, 'a plurality of conductor-mounted detectors (CMDs) configured to couple to an electrical conductor, each CMD comprisinga receiver in communication with each of the plurality of CMDs and configured to receive the fault signal from at least one of the plurality of CMDs; and identify each of the plurality of CMDs to transmit the fault signal;', 'determine a protective action based on each of the plurality of CMDs to transmit the fault signal to minimize an area of the electric power system to clear the fault; and', 'implement the protective action., 'a protective action subsystem in communication with the receiver, the protective action ...

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Номер записи: 100
20-04-2017 дата публикации

DETERMINING STATUS OF ELECTRIC POWER TRANSMISSION LINES IN AN ELECTRIC POWER TRANSMISSION SYSTEM

Номер: US20170108542A1
Автор: Gubba Ravikumar Krishnanjan, Korkmaz Yusuf Zafer, Nayak Bharath, Upreti Ashish
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present application discloses systems and methods to determine loss of at least one electric power transmission line in an electric power transmission system. In various embodiments, a system consistent with the present disclosure may include an electrical parameter monitoring subsystem configured to receive electrical parameter measurements and to determine a change of the electrical measurements. An analysis subsystem may determine whether a change in the electrical measurements is indicative of loss of at least one transmission line and may calculate a number of transmission lines lost based on the change. In some embodiments, a remedial action subsystem may be configured to implement a remedial action in response to loss of at least one transmission line. The number of transmission lines lost may be determined based on an angle difference ratio and a power ratio between two buses in electrical transmission system. 116-. (canceled)17. A system configured to determine a status of an electric power transmission line in an electric power transmission system , the system comprising: receive a first plurality of electrical parameter measurements taken at a first location over a first period of time;', 'receive a second plurality of electrical parameter measurements taken at a second location over the first period of time;', 'establish at least one rate of change of angle difference threshold and one angle difference threshold;, 'an electrical parameter monitoring subsystem configured to determine a first rate of change based on the first plurality of electrical measurements and the second plurality of electrical measurements over the first period of time;', 'determine that the first rate of change is within the at least one rate of change threshold;', 'dynamically adjust the angle difference threshold based on the first rate of change;, 'a threshold adjustment subsystem configured toan analysis subsystem configured to determine that the electric power transmission ...

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Номер записи: 101
02-06-2022 дата публикации

MEDIA ACCESS CONTROL SECURITY (MACSEC) SANDBOXING FOR SUSPECT DEVICES

Номер: US20220173907A1
Автор: Gordon Colin, Herrmann William
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

A key server may establish an initial media access security (MACsec) connectivity association (CA) between a set of devices on a communication network of a power system. The key server may identify a device in the set of devices on the initial CA as a suspect device. The key server may communicate a new connectivity association key (CAK) of an independent CA to one or more other devices in the set of devices to cause the one or more other devices to join an independent CA without the suspect device. 1. A key server , comprising:a memory; and establishing an initial media access security (MACsec) connectivity association (CA) between a set of devices on a communication network of a power system;', 'identifying a device in the set of devices on the initial CA as a suspect device; and', 'upon identifying the suspect device, sending one or more unicast MACsec key agreement (MKA) messages having a new connectivity association key (CAK) of an independent CA to each of the other devices in the set of devices to cause each of the other devices, except the suspect device, to join the independent CA to continue communicating power system data to each other without the suspect device, thereby isolating communication of the suspect device from the other devices., 'a processor operatively coupled to the memory, wherein the processor is configured to execute instructions stored on the memory to cause operations comprising2. (canceled)3. (canceled)4. The key server of claim 1 , wherein each unicast MKA message comprises a destination address of a corresponding device in the other devices.5. (canceled)6. The key server of claim 1 , wherein the processor is configured to cause operations comprising detecting that the suspect device is suspicious based on downtime of the suspect device.7. The key server of claim 1 , wherein the processor is configured to cause operations comprising receiving claim 1 , from the suspect device claim 1 , a tampering signal indicating that the suspect ...

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Номер записи: 102
10-07-2014 дата публикации

Preventing Out-of-Synchronism Reclosing Between Power Systems

Номер: US20140191591A1
Автор: Finney Dale S, Kasztenny Bogdan Z
Принадлежит: SCHWEITZER ENGINEERING LABORATORIES, INC.

The present disclosure provides apparatus, systems, and methods for preventing out-of-synchronism closing between power systems. An intelligent electronic device (IED) apparatus may include a control component and a delay component. The control component is configured to selectively control opening and closing of a breaker. The control component selectively outputs a close signal to cause the breaker to connect a first portion of a power delivery system to another portion of the power delivery system. The delay component is configured to delay output of the close signal to the breaker. The delay component includes circuitry independent from control by the control component and the delay component is inconfigurable from a remote location. 1. An intelligent electronic device (IED) , comprising:a control component configured to selectively control opening and closing of a breaker, wherein the control component selectively outputs a close signal to cause the breaker to connect a first portion of a power delivery system to another portion of the power delivery system; anda delay component configured to delay output of the close signal to the breaker, wherein the delay component comprises circuitry independent from control by the control component and wherein the delay component is inconfigurable from a remote location.2. The IED of claim 1 , wherein the delay component comprises a hardware configuration component and wherein the delay component is configurable on-site using the hardware configuration component.3. The IED of claim 2 , wherein the hardware component comprises a switch.4. The IED of claim 2 , wherein the hardware component comprises a jumper terminal.5. The IED of claim 2 , wherein the delay component is configurable to a no-delay state wherein output of the close signal is not delayed.6. The IED of claim 2 , wherein output of the close signal is delayed by a delay time claim 2 , wherein the delay time is configurable by the hardware component.7. The IED of ...

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Номер записи: 103