СПОСОБ И СИСТЕМА ПРИВЯЗАННЫХ МАРШРУТИЗАТОРОВ

Изобретение относится к области электротехники, в частности беспроводной связи, электрической сети и электрораспределительным сетям. Технический результат заключается в обеспечении эффективного покрытия беспроводной связи и/или дистанционной регистрации. Достигается тем, что устройство содержит: модуль подачи питания с возможностью извлечения электрической энергии из магнитного поля, окружающего электрический кабель, приемопередатчик с возможностью сообщения в транспортной сети связи, приемопередатчик для беспроводной локальной сети и/или блок дистанционной регистрации, и модуль управления, соединенный с возможностью сообщения с приемопередатчиком и/или блоком дистанционной регистрации, причем устройство установлено вокруг одиночного электрического кабеля электропередающей сети и/или электрораспределительной сети и выполнено с возможностью получения энергии от одиночного электрического кабеля. 2 н. и 15 з.п. ф-лы, 2 ил.

УСТРОЙСТВО ДЛЯ СРАВНЕНИЯ ДВУХ СИГНАЛОВ, УСТРОЙСТВО И СПОСОБ ФОРМИРОВАНИЯ НЕСТАЦИОНАРНЫХ СИГНАЛОВ

Изобретение относится к устройствам для сравнения двух комплексных векторных величин в реальном времени и может быть использовано для формирования нестационарных сигналов. Техническим результатом является ускорение сравнения двух сигналов. Изобретение использует цифровые методы, основанные на свойствах цилиндрического устройства для сравнения комплексных векторных величин в реальном времени, в одном случае используется сигнал вращательного момента, генерируемый цифровым компаратором, для обнаружения наличия сбоя в передающей линии, в другом случае используется выходной сигнал для определения направления потока мощности в передающей линии, в третьем случае, чтобы определить, превосходят или нет напряжение или ток заданный пороговый уровень. 3 с. и 20 з. п. ф-лы, 10 ил.

ИСПЫТАТЕЛЬНОЕ УСТРОЙСТВО И СПОСОБ ПОДГОТОВКИ ИСПЫТАНИЯ БЛОКА УПРАВЛЕНИЯ ПЕРЕКЛЮЧАЮЩЕГО УСТРОЙСТВА РАСПРЕДЕЛИТЕЛЬНОГО УСТРОЙСТВА

Изобретение относится к испытательным установкам электрооборудования. Испытательное устройство и соединенный с ним адаптерный кабель для блока управления переключающего устройства распределительного устройства имеет некоторое число сигнальных входов и выходов и через адаптерный кабель может соединяться с блоком управления. Испытательное устройство моделирует переключающее устройство для испытания. На адаптерном кабеле предусмотрен блок памяти, в котором сохранены и могут считываться испытательным устройством специфические для конфигурации данные. Испытательное устройство самостоятельно конфигурирует свои сигнальные входы и выходы, необходимые для выполнения испытания, в соответствии со специфическими для конфигурации данными. Повышается универсальность устройства. 3 н. и 10 з.п. ф-лы, 5 ил.

ИНТЕЛЛЕКТУАЛЬНЫЙ СЧЁТЧИК ЭЛЕКТРИЧЕСКОЙ ЭНЕРГИИ СТАТИЧЕСКИЙ

Изобретение относится к электронно-цифровой электроизмерительной технике, устройствам контроля, учёта и анализа производства или потребления электрической энергии в однофазных и трехфазных цепях переменного тока, может быть использовано в различных отраслях экономики, науки и техники, на объектах электроэнергетики и у потребителей (пользователей) электрической энергии, в автоматизированных информационно-измерительных системах контроля и учёта электрической энергии и других видов энергоресурсов, массового сбора данных и информации с различных оконечных устройств, включая счётчики, датчики, сенсоры и детекторы по видам энергоресурсов, движения, положения и совершаемых действий, а также иных интеллектуальных технических средств и их централизованной программной обработки. Устройство содержит корпус, сетевой выпрямитель, стабилизатор опорных напряжений электропитания, микроконтроллер управления электропитанием и первоначального сброса, резервный источник электропитания, зажимную плату цепей ...

СПОСОБ И СИСТЕМА ДИНАМИЧЕСКОГО ОБНАРУЖЕНИЯ НЕИСПРАВНОСТЕЙ В ЭЛЕКТРИЧЕСКОЙ СЕТИ

ИСПЫТАТЕЛЬНАЯ УСТАНОВКА И СПОСОБ ИСПЫТАНИЯ РАСПРЕДЕЛИТЕЛЬНОГО УСТРОЙСТВА

ПРЕРЫВАТЕЛЬ ДУГОВОГО КОРОТКОГО ЗАМЫКАНИЯ И КОРОТКОГО ЗАМЫКАНИЯ НА ЗЕМЛЮ, ИСПОЛЬЗУЮЩИЙ ЕДИНСТВЕННЫЙ ДАТЧИК КОРОТКОГО ЗАМЫКАНИЯ НА ЗЕМЛЮ И ЕДИНСТВЕННЫЙ ADC

АНАЛИЗ РАСПРЕДЕЛИТЕЛЬНОЙ СИСТЕМЫ, ИСПОЛЬЗУЮЩИЙ ДАННЫЕ ЭЛЕКТРОСЧЕТЧИКОВ

... 1. Система контроля, сконфигурированная таким образом, чтобы определять, по меньшей мере, одно условие работы фазового провода в распределительной системе, причем система контроля содержит;первый датчик, расположенный в некотором первом месте на линии фазового провода, при этом первый датчик сконфигурирован таким образом, чтобы генерировать первый набор данных синхронизированного фазора;второй датчик, расположенный в некотором втором месте на линии фазного провода, при этом второй датчик сконфигурирован таким образом, чтобы генерировать второй набор данных синхронизированного фазора; ипроцессор, сконфигурированный таким образом, чтобы принимать первый набор данных синхронизированного фазора и второй набор данных синхронизированного фазора и определять напряжение на стороне первичной обмотки, по меньшей мере, одного распределительного трансформатора, имеющего электрическое соединение с этим фазовым проводом, на основе напряжения на стороне вторичной обмотки этого, по меньшей мере, одного ...

СПОСОБ СИНХРОФАЗОРНОГО ИЗМЕРЕНИЯ ДЛЯ ИСПОЛЬЗОВАНИЯ В УСТРОЙСТВЕ ИЗМЕРЕНИЯ ФАЗОРОВ (PMU) Р-КЛАССА

Leistungsüberwachungssystem

Leistungsüberwachungssystem, umfassend:ein Mobiltelefon,ein drahtloses Kommunikationsendgerät, das auf ein Internet zugreift und mit dem Mobiltelefon verbunden ist,einen Server, der auf das Internet zugreift und mit einer festgelegten Website und einem festen Abhören-Port konfiguriert ist;ein Leistungsüberwachungsendgerät, das an einem Überwachungsort für eine elektrische Ausrüstung angebracht ist und mit dem drahtlosen Kommunikationsendgerät verbunden ist und die Website des Servers, den Abhören-Port und die Telefonnummer des Mobiltelefons speichert, wobei das Leistungsüberwachungsendgerät über das drahtlose Kommunikationsendgerät mit dem Server auf der Basis der Website des Servers und des Abhören-Ports kommuniziert, und die Daten an den Server sendet und die von dem Server ausgehenden Befehle empfängt.

Apparatus and method for measuring an electric current in an electrical conductor

Distributed electricity metering system

Measuring residual current and power consumption

A measuring device for an AC electrical installation comprising live and neutral conductors 2,3 comprises a toroidal transformer 1 for detecting a residual current and shunt resistors 6a,6b providing a current signal for each conductor 2,3 and processor 13 which generates a trip signal 03 in response to residual current and/or the conductor current signals. Circuit breakers 15,16 may operate in response to trip signal 03. Optionally resistors 8a,9,8b provide a signal representing the voltage between conductors 2,3 which is fed to processor 13 with residual current signals and conductor current signals through analogue to digital converters and a multiplexer. Processor 13 may use the voltage and current signals to calculate power consumed, which may also be transmitted to a remote station.

Multifunction adaptive controls for tapswitches and capacitors

Measuring devices

Current differential relay

The present invention is equipped with a merging unit (3-1), a merging unit (3-2), an intelligent electric device (4-1), and an intelligent electric device (4-2). The intelligent electric devices (4-1, 4-2) each have a signal control unit (23), which determines the time difference between the sampling timing of the merging unit (3-1) and the sampling timing of the merging unit (3-2) on the basis of digital data from one end of a protection region and digital data from the other end of the protection region, and which controls the period of a sampling timing control signal so as to eliminate this time difference, and which outputs this controlled sampling timing control signal to the merging unit corresponding to each intelligent electric device. The merging units (3-1, 3-2) each have a control signal output circuit (16), which generates a sampling signal synchronized with the sampling timing control signal from the intelligent electric devices (4-1, 4-2) and outputs this sampling signal ...

Wireless remote power monitoring method and device therefor

A kind of wireless remote power monitoring method comprising: sensing and monitoring the current flow of the independent N-1 insertions British Thirteen Ampere socket and the built-in circuit board by N sets of Hall-effect current sensors, and sensing and monitoring the input voltage through a set of resistor-divider voltage sensors(S1); calculate the relevant electric energy and electricity consumption data of N sets of electric power, voltage and current separately, analyze and store them (S2); based on the fixed collection time, uploading the calculated electric power, voltage and current related to N sets of electric energy and power consumption data to the server by the general wireless network method, have the server to process and store, and provide users with information and analysis about power and power consumption (S3); and an associated device. The step of calculating the current may include offset correction and denoising based on the sinusoidal waveform of the alternating ...

Grid frequency response

Methods and apparatus to provide a response to changes in a frequency of electricity flowing in an electric power grid 100, in which a measurement system determines a frequency response characteristic of the grid, and, based on this characteristic, determines one or more trigger parameters. A power control device 800 intermittently receives one or more parameters from the measurement system, and derives a trigger frequency condition on the basis of the received parameters. The power control device determines, based on a measured frequency characteristic of electric power flowing in the grid, whether the trigger condition is satisfied. In response to a determination that the trigger condition is satisfied, the power control device is arranged to change a power flow to and/or from a power unit 119 with which it is associated. This enables an effective response to a measured change in electric power in a power grid to be provided.

Electrical load management method and apparatus

Electrical load management method and apparatus

An electrical load management system 1 for a vehicle power supply system having a high voltage network (NHV, figure 1) and a low voltage network (NLV) coupled to each other by a DC-DC converter 6. The electrical load management system has a controller (10) for controlling one or more high voltage vehicle electrical system VSHV connected to the high voltage network and one or more low voltage vehicle electrical system VSLV connected to the low voltage network. The controller has a processor (11) for receiving command signals for the high and low voltage vehicle electrical systems (VSHV, VSLV); and a memory device (12) having instructions stored and coupled to the processor. The processor is configured to determine a first electrical load on the high voltage network and a second electrical load on the low voltage network in dependence on the command signals. The processor controls operation of the high and low voltage vehicle electrical systems in dependence on the determined first and second ...

Power distribution control with asset assimilation

Fault waveform recording device

Provided is a fault waveform recording device (100), in which a first storage unit (43) stores the latest electrical quantity data of a first interval, said data having been detected from an electrical system when said electrical system is operating normally, while successively updating said data, and when a fault is detected in the electrical system, suspends updating the stored data after a second interval has elapsed from the detection of the fault. The second interval is shorter than the first interval. A first computation unit (44): stores in a second storage unit (45), among the data of the first interval which is stored in the first storage unit (43) after the suspension of the updating of the stored data, data of the first interval which includes the fault detection time without modifying the data; downsample processes data of an excess second interval excluding the first interval; and stores said data in the second storage unit (45).

Cover Assembly

Device and a system for controlling voltage

Analysing a power circuit

Analysing a power circuit

Fault isolation

A system and method for fault location and isolation in an electrical power distribution network where the network includes a plurality of switching devices 206, 208 provided along a feeder 204, detecting an overcurrent event in the network from the fault 210 and interrupting the overcurrent event by opening and then immediately locking out or subsequently reclosing and testing the fault. A count value is increased in each switching device 206, 208 that detected the overcurrent event. A count and current (C&I) message 212 is sent from each of the switching devices that detected the overcurrent event and then detected the loss of voltage upstream to an upstream neighbour switching device. Current measurements in the C&I messages, measured current by the devices and the counts values in the devices determine what devices are opened to isolate the fault.

System, apparatus and method for localisation of developing faults on power distribution networks

A fault detection system for an electrical power distribution network with a plurality of branch circuits comprises one or more magnetic field sensors 30 deployable on the ground over a buried cable 50b to measure fault waveforms. The captured fault waveforms indicate a pre-fault current and are time stamped. The passage of the same fault event in one or more branch circuits can be determined by a plurality of sensors for localisation of the fault. The sensor 30 is housed in a mat, speed bump, footway board or trench cover 12 which can be placed on a pavement or road over an underground cable. The sensor has a communications module 34 which sends data to a remote server 62. The server may collect time-stamped data from several sensors and use this information to calculate the location of the fault. The magnetic field sensor may be a Hall sensor, flux loop, or other sensor.

PROCEDURE AND DEVICE FOR THE CURRENT MEASUREMENT AT INVERTER EXITS

SIMILAR SIGNAL TRANSMISSION FLOATING WITH CALIBRATION FUNCTION

RECOGNITION PROCEDURE F R AN ELECTRICAL MEHRPHASENMASCHINE

SAMPLING MODULE AND PROCEDURE FOR SCANNING A OR SEVERAL SIMILAR KENNGRÍSSEN OF AN ENERGY TRANSMISSION SYSTEM

MECHANISM FOR THE POWER SUPPLY OF MEASURING SENSORS AND TRANSMISSION OF A SYNCHRONOUS CLOCK PULSE TO THESE

PROCEDURE FOR SUPERVISING THE ELECTRIC POWER QUALITY IN AN ELECTRICAL ENERGIEVERSORGUNGSNETZ, POWER QUALITY FIELD EQUIPMENT AND A POWER QUALITY SYSTEM

FAULT CURRENT ANALYZER FOR THE COLLECTION OF A FAULT CURRENT AND A MECHANISM WITH FAULT CURRENT COLLECTION FUNCTION

PROCEDURE FOR THE DIRECTION RECOGNITION OF A MASS ERROR AND A DEVICE FOR THE CONVERSION OF THIS PROCEDURE

PROCEDURE AND SYSTEM FOR THE COUPLING OF RADIO FREQUENCY SIGNALS AT MEDIUM VOLTAGE LINES WITH A DEVICE WITH AUTOMATIC VOTE

SWITCHING CONFIGURATION AND PROCEDURE FOR MEASURING AND LIMITING RIVERS

Test apparatus and method for testing a switchgear

Um auf einfache Weise Schaltanlagen von verschiedenen Herstellern und Typen prüfen zu können, ist vorgesehen, dass eine Steuereinheit (6) für eine Schaltvorrichtung (5) der Schaltanlage (4) über ein Adapterkabel (11) mit einem Prüfgerät (10), das für die Prüfung die Schaltvorrichtung (5) nachbildet, verbunden wird und das Prüfgerät (10) aus einer Speichereinheit (15) am Adapterkabel (11) konfigurationsspezifische Daten ausliest und das Prüfgerät (10) damit seine für die Durchführung der Prüfung benötigten Signaleingänge (BE) und Signalausgänge (BA, AA) konfiguriert.

Verfahren und Vorrichtung zur Inselnetzerkennung

Die Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zur Inselnetzerkennung in Eigenerzeugeranlagen, bei dem ein mit einem Inselnetzbetrieb zusammenhängendes Inselkriterium überprüft wird, indem mindestens eine elektrische Zustandsgröße eines öffentlichen Stromnetzes erfasst und festgestellt wird, ob diese einen vorgegebenen Toleranzbereich verlässt. Eine zuverlässige Inselnetzerkennung wird dadurch erreicht, dass dann, wenn ein Verlassen des Toleranzbereiches (30) festgestellt wird, eine Zeitmessung ausgelöst wird und ein Erkennungssignal für den Inselnetzbetrieb innerhalb einer vorgegebenen Zeitspanne (At) von höchstens fünf Sekunden nach dem Start der Zeitmessung abgegeben wird, falls die Zustandsgröße während der Zeitspanne (At) fortlaufend außerhalb des Toleranzbereichs (30) liegt.

CIRCUIT FOR THE COLLECTION OF THE PHASE STREAM IN POLYPHASE RETICULATED SYSTEMS

MEASURING PROCEDURE FOR A HIGH VOLTAGE EXECUTION AND A SUITABLE MEASURING INSTRUMENT

MESSSYSTEM ZUR FERNMESSUNG VON STROM UND SPANNUNG IN ELEKTROENERGIENETZEN

PROCEDURE AND DEVICE FOR THE CURRENT MEASUREMENT AT INVERTER EXITS

PROCEDURE AND DEVICE FOR THE CURRENT MEASUREMENT AT INVERTER EXITS

PROCEDURE AND DEVICE FOR THE CURRENT MEASUREMENT AT INVERTER EXITS

PROCEDURE AND DEVICE FOR THE CURRENT MEASUREMENT AT INVERTER EXITS

PROCEDURE AND DEVICE FOR THE CURRENT MEASUREMENT AT INVERTER EXITS

PROCEDURE AND DEVICE FOR THE CURRENT MEASUREMENT AT INVERTER EXITS

PROCEDURE AND DEVICE FOR THE CURRENT MEASUREMENT AT INVERTER EXITS

PROCEDURE AND DEVICE FOR THE CURRENT MEASUREMENT AT INVERTER EXITS

PROCEDURE AND DEVICE FOR THE CURRENT MEASUREMENT AT INVERTER EXITS

PROCEDURE AND DEVICE FOR THE CURRENT MEASUREMENT AT INVERTER EXITS

PROCEDURE AND DEVICE FOR THE CURRENT MEASUREMENT AT INVERTER EXITS

PROCEDURE AND DEVICE FOR THE CURRENT MEASUREMENT AT INVERTER EXITS

Control of multiple energy storages in a microgrid

The present disclosure relates to a method performed by a network controller 4 of an electrical microgrid 1 comprising a plurality of energy storages 2. Each of the energy storages is associated with a respective storage controller 3. The method comprises receiving information about a measurement made at a remote location RL in the microgrid. The method also comprises obtaining respective participation factors in respect of the remote location for each of at least a first energy storage 2a and a second energy storage 2b of the plurality of energy storages. The method also comprises obtaining respective states of charge of each of said at least first and second energy storages. The method also comprises, for each of the at least first and second energy storages, calculating a reference value for the energy storage 2a or 2b, and sending the reference value to the storage controller 3a or 3b with which the energy storage is associated. The calculating comprises calculating the reference value ...

ELECTRICITY METER

A meter for measuring electricity use including digital memory which stores configuration data describing the installation of the meter and communication means which receives the configuration data for storage in the digital memory and transmits the configuration data retrieved from the digital memory. The meter may include separate communication interfaces adapted to receive the configuration data and to transmit the configuration data. e0 0 c oo o 0 uu ...

System and method for electrical power and/or energy metering on multiple channels

A system (10) for power and/or energy consumption metering on an AC powerline network (1) supplying a plurality of channels (C ...

Ground fault detection in ungrounded power systems

Methods, systems, and apparatus, including computer programs stored on a computer-readable storage medium, for obtaining, from an electric field sensor, measurements of a net electric field resulting from a combination of respective electric fields from two or more electrical power conductors that are proximate to the electric field sensor. The apparatus detects a change in successive measurements of the net electric field. The apparatus determines, based on the change, that an electrical fault has occurred in one of the two or more electric power conductors. The apparatus sends to a server system, data indicating that the electrical fault has occurred in one of the two or more electric power conductors.

An AC current sensor for measuring electric ac current in a conductor and an indicator system comprising such a sensor

Power measuring system, measuring apparatus, load terminal, and device control system

Real-time system verification and monitoring of protective device settings within an electrical power distribution network

Three-phase detection module

System of intelligent sensors in an electrical panelboard

According to one aspect, embodiments of the invention provide a system for monitoring a plurality of circuit branches, the system comprising a plurality of current sensors, each configured to be coupled to at least one of the plurality of circuit branches and to produce a signal having a level related to a current level of the one of the plurality of circuit branches, a communications bus, a plurality of sensor circuits, wherein each one of the plurality of sensor circuits is configured to convert the signal from the associated one of the plurality of current sensors to a digital measurement signal and provide the digital measurement signal to the communication bus, and a controller configured to receive the digital measurement signal from each sensor circuit over the communication bus and transmit data related to the digital measurement signal from each sensor circuit to an external client.

State-matrix-independent dynamic process estimation method in real-time for weakly observable measurement nodes without PMU

A state-matrix-independent dynamic process estimation method in real-time for weakly observable measurement nodes without PMU is only dependent on real-time measurement dynamic data of measurement nodes with Phasor Measurement Unit (PMU) and measurement data of Supervisory Control And Data Acquisition (SCADA) system in electric power system or state estimation data. According to the SCADA measurement data or state estimation data at some continuous moments, the method utilizes recursive least squares solution to find a linear combination relationship between variation of measurement parameter to be estimated of nodes without PMU and variation of corresponding measurement parameter of nodes with PMU. Using the linear combination relationship, the dynamic process of measurement nodes without PMU is estimated in real-time. The method provides high estimation precision and meets error requirements of engineering application.

Dual totem current sensor for measuring load current in an h-bridge power stage

Validation of electric power system monitoring systems

The present disclosure provides systems and methods for validating electric power delivery monitoring systems, including, but not limited to, current transformers (CTs) and voltage potential transformers (PTs). According to various embodiments, a first IED monitors a portion of an electric power delivery system via one or more CTs and/or PTs. A second IED monitors the portion of the electric power delivery system via one or more additional CTs and/or PTs. Each IED may generate an event report, containing measurement data, associated with each respective measurement equipment. A validation module may compare the event reports in order to validate that the lEDs and/or the underlying measurement equipment are functioning correctly. According to various embodiments, the validation module may be configured to align the event reports from two lEDs using an event trigger common to both lEDs.

Method For Inferring Downtime From Power Quality Data

A method comprises detecting a power quality event, determining if one or more power outages occurs in a defined time period extending from a beginning of the power quality event to an end of the power quality event, and if one or more power outages occurs in the defined time period, then performing an analysis, where performing the analysis comprises determining if the one or more power outages is associated with the power quality event. The method may also comprise outputting the information regarding the analysis to a display device. A (130A) B1 (13081) B2 (13082) jC1 iC2 C3 C4 (1 30C4) (130C1) (13002) (130C3) ...

Direct current meter and method of use

An apparatus and method measures and analyzes DC current passing through a substantially insulating member or dielectric material that is electrically connected to, or otherwise conductive, between an energized DC electrical transmission line and an Earth potential or ground. An apparatus may utilize a DC current measuring device, a DC voltage level selection switch, a DC display, a graphical display of momentary leakage current, and an audio speaker. A process may entail extending a substantially insulating member or dielectric material between an energized DC electrical transmission line and an Earth potential, detecting a DC momentary leakage current, using a DC momentary leakage current meter to measure DC current through the member or material, and a computer to analyze and compare the DC current, and deliver results or a warning that the DC current has reached a threshold value.

Apparatus for triggering alarms and waveform capture in an electric power system

Method and apparatus for deriving power system data from configurable source points

THREE-PHASE POWER SIGNAL PROCESSOR

A Three-phase Power Signal Processor (TPSP) is disclosed for general three- phase power system applications. The TPSP is developed based on the concepts from adaptive filter and dynamical systems theories. The structure of the TPSP is unified as it provides a multiplicity of the signals and pieces of information without the need to change, modify, or enhance the structure or to impose excessive computational time or resource requirements. The presented TPSP receives a set of three-phase measured signals, which can be voltage, current, magnetic flux, etc, and provides (1) the instantaneous and steady- state symmetrical components, (2) the fundamental components, (3) the peak values (magnitudes) of the symmetrical components, (4) the frequency and its rate of change, (5) the synchronization signal(s) and zero-crossing instants, (6) the phase-angles of the symmetrical components, and (7) the disturbance signatures. Two or more TPSP units, when properly augmented, further provide (8) the individual ...

ADAPTIVE SAMPLING RATE BASED ON POWER SYSTEM FREQUENCY

A method and system for synchronizing the sampling frequency, at which power system data is sampled, with the frequency of the power system. Adjustments to the sampling frequency can be made by comparing first and second derivatives to threshold values.

METHOD AND APPARATUS FOR DETERMINING A CURRENT IN A CONDUCTOR

The present invention provides a method of determining a current in a conductor. The method comprises the steps of determining the n th spatial derivative of at least one vector component of the magnetic field associated with the current at at least one position and calculating the current from the n th spatial derivative. The present invention also provides an apparatus for determining a current in a conductor. The apparatus comprises a means for determining at least one vector component of the magnetic field associated with the current at at least two different positions and a means for determining the n th spatial derivative of at least one vector component of the magnetic field from the or each vector component of the magnetic field measured at the at least two positions. The apparatus also comprises a means for calculating the current from the n th spatial derivative.

AN APPARATUS AND METHOD FOR ESTIMATING SYNCHRONIZED PHASORS AT PREDETERMINED TIMES REFERENCED TO A COMMON TIME STANDARD IN AN ELECTRICAL SYSTEM

An apparatus and method estimates a plurality of synchronized phasors at predetermined times referenced to a common time standard in an electrical power system. The method includes acquiring and determining a frequency of a power system signal, sampling the power system signal at a sampling interval rate based on a frequency of the power system signal to form signal samples, and generating a plurality of acquisition time values based on an occurrence of each of the signal samples at a corresponding plurality of different times referenced to the common time standard. The method further includes adjusting a phasor of each of the signal samples based on a time difference between a corresponding selected acquisition time value and a predetermined time referenced to a common time standard to form the plurality of synchronized phasors.

FRACTIONAL SAMPLES TO IMPROVE METERING AND INSTRUMENTATION

Methods and devices to determine values relating to metering a power line signal. A power line signal may be sampled by defining accumulation intervals associated with the power line signal. An accumulation interval may comprise sample periods. Samples are taken during sample periods. Values associated with the samples are determined for each sample period. A sample period may be associated with one or more accumulation intervals. When a sample period belongs to one accumulation interval, the sample period may be allocated to the one accumulation interval. When a sample period is associated with more than one accumulation interval, portions of the sample period may be allocated to the accumulation intervals to which the portions belong. Values determined for a sample period may be allocated to one or more accumulation intervals by allocating the values in relation to the allocation of the sample periods.

APPARATUS AND METHOD FOR THE MEASUREMENT AND MONITORING OF ELECTRICAL POWER GENERATION AND TRANSMISSION

An apparatus and method in accordance with the present invention allows for a determination of the amount and direction of electric power being produced by a particular high voltage electric power transmission line. The present invention consists of a monitoring device (10) consists of a weatherproof housing (12) containing the electric potential and magentic field measurement components and a second weatherproof housing (14) containing the necessary processing and communications somponents, including a power supply and data transmission equipment.

METHOD FOR DETECTING LOW-FREQUENCY OSCILLATIONS AND DETECTION DEVICE FOR SAME

The invention relates to a method for detecting low-frequency oscillations, more particularly subsynchronous resonances, in an electrical supply network (306), wherein the electrical supply network (306) has a mains voltage with a rated network frequency, which method comprises the steps of: detecting at least one electrical signal of the electrical supply network (306) and evaluating the electrical signal by means of a wavelet analysis in which a time-dependent frequency pattern (420) is created by way of a correlation analysis of the detected signal with a predetermined wavelet mother function (502), wherein the presence of a low-frequency oscillation is assumed if at least one further low frequency component is present in the time-dependent frequency pattern (420) in addition to a basic component.

METHOD AND SYSTEM PROVIDING FEEDER FAULT RESPONSE

A method for determining whether a fault is on a feeder line or a lateral line so as to allow an upstream recloser on the feeder line to immediately open in response to the fault if it determines the fault is on the feeder line. The method includes measuring a downstream voltage on the feeder line at a downstream recloser during the fault and transmitting the downstream voltage from the downstream recloser to the upstream recloser. The method can determine that the fault is on the feeder line or the lateral line by determining whether the fault voltage is approximately the same as the downstream voltage, or by comparing a first distance from the upstream recloser to the fault location using the fault voltage and a second distance from the upstream recloser to a last location of the fault current on the feeder line using the downstream voltage.

DETERMINING A CHARACTERISTIC OF AN INERTIAL CONTRIBUTION TO AN ELECTRIC POWER GRID

Methods, and apparatus for determining a characteristic of an inertial contribution to an electrical power grid are described. A change in inertia in the electrical power grid based on one or more inertia measurements performed in a first time period is determined. On the basis of the determined change in inertia and data indicative of an inertia contribution characteristic of one or more energy production facilities and/or one or more energy consuming devices in the electric power grid, a characteristic of an inertial contribution to the electrical power grid is determined for a second time period different to the first time period.

METHOD AND SYSTEM FOR DETERMINING PHASOR COMPONENTS OF A PERIODIC WAVEFORM

The present disclosure relates to a method of determining phasor components of a periodic waveform, wherein the method comprises: a) sampling the periodic waveform, b) determining a frequency spectrum of the sampled periodic waveform by means of a frequency transform utilizing a Gaussian window function, wherein a ratio np defined by the duration (T0) of the sampling of the periodic waveform divided by the width parameter (tw) of the Gaussian window function is at least 5, c) selecting a region of the frequency spectrum containing a frequency peak defined by a group of consecutive frequency bins each being defined by a frequency value and a magnitude value, and d) determining phasor components of the periodic waveform based on the group of consecutive frequency bins.

INDUCTIVE POWER TRANSFER CONTROL

The present invention aims at a more efficient solution for a detection of operating conditions in an inductive power transfer system (10; 34) and for improved control of the inductive power transfer system (10; 34). According to the present invention an operating condition at a secondary side of an inductive power transfer system is detected by measuring (S10) at least one electric variable at a primary side of the inductive power transfer system (10; 34) which is dynamically coupled to the operating condition at the secondary side of the inductive power transfer system (10; 34). Then follows an analysis of the at least one electric variable over time at the primary side of the inductive power transfer system (10; 34). This allows to detect a change of the operating condition at the secondary side of the inductive power transfer system (10; 34). The present invention also relates to a control method and related controller apparatus (70) using the detection method according to the present ...

RESISTANCE-MEASURING DEVICE AND METHOD

A resistance-measuring device mountable to a component of a current-carrying transmission line. The device includes a body having a base and two arms with interconnected first ends and spaced-apart second ends. The arms define a gap therebetween. Each arm has an inner portion facing the gap. The body is displaceable to mount the body about the component and position the component within the gap. The body has an abrading mechanism mounted to the arms. The abrading mechanism has an electrically-conductive abrading element disposed along the arm and facing inwardly toward the gap. The abrading element rubs against an outer surface of the component upon displacing the body to mount the body about the component. A method is also disclosed.

ARC DETECTION IN ELECTRIC METER SYSTEMS

An electrical metering system in a utility box is capable of receiving electrical signals received from a power utility company. The electrical metering system includes measurement circuitry capable of measuring properties of the received electrical signals. Based on the measurements, a determination is made that an arcing condition is present in the utility box. Based on the determination that the arcing condition is present, a disconnect circuit is activated to interrupt the connection between a source of the electrical signals and a premises.

WIND ENERGY SYSTEM AND METHOD FOR IDENTIFYING LOW-FREQUENCY OSCILLATIONS IN AN ELECTRICAL SUPPLY NETWORK

The invention relates to a method for identifying low-frequency oscillations, in particular subsynchronous resonances, in an electrical supply network (510), wherein the electrical supply network (510) has a network voltage with a nominal network frequency, comprising the following steps: detecting at least one electrical signal of the electrical supply network (510) as at least one test signal and filtering and/or transforming the at least one detected test signal into at least one analysis signal, deriving the at least one analysis signal with respect to time or calculating the difference between temporally spaced values of the analysis signal, in order to obtain a gradient signal in each case, identifying the presence of a low-frequency oscillation if the gradient signal or at least one of the gradient signals satisfies a predefined analysis criterion, in particular that at least one predefined analysis limit is exceeded.

SYSTEMS AND METHODS FOR DETERMINING THE PHASE USED FOR POWERING A LOAD

System and methods for determining loading on supply lines of a three-phase power distribution system. Load meters are connected to the supply lines to receive power. A feeder meter is connected to a supply line designated the reference supply line having a known reference phase. A device generates a timing pulse received by the load meters and the feeder meter. The load meters and feeder meter each determine a respective time delay and feeder meter delay from receiving the timing pulse until a landmark value of the power received. The feeder meter delay corresponds to the reference phase. Each load meter and feeder meter includes a transmission device to transmit the time delay or feeder meter delay. An end server receives the time delays and feeder meter delay and assigns each load meter to a phase by comparing the time delay for a load meter to the feeder meter delay.

A METHOD AND SYSTEM FOR DYNAMIC FAULT DETECTION IN AN ELECTRIC GRID

A system for detecting a fault in an electric grid, including a plurality of grid measuring devices distributed in the electric grid, being operative to measure current and/or voltage with their respective time of occurrence, enabling a user to define at least one fault type, and at least one rule for detecting the fault type, the rule associating the fault type with at least one of the measurements, executing the measurements, and analyzing the measurements according to the rule to detect a fault.

ASYNCHRONOUS AC MEASUREMENT SYSTEM

... ²Accurate measurements of electrical power at various points of a power grid is ²becoming ²more important and, at the same time, is getting more difficult as the old ²power distribution ²model of a few, large power generating stations and a multitude of relatively ²linear loads is ²replaced by a newer model containing a multitude of smaller, and to some ²degree ²unpredictable power sources, as well as a multitude of not always linear and ²often smart ²(essentially also unpredictable) loads. Embodiments of the invention provide ²for high ²accuracy voltage, current and power measurements of quasi-stationary and ²stationary ²waveforms in single and multiple phase power systems. Precision AC voltage, ²current, phase, ²power and energy measurements in power networks may be measured with current ²ranges ²from lmA to 20kA and voltage ranges from 1V to 1000kV and in a frequency range ²from a ²few hertz to one hundred kilohertz.² ...

METHOD AND APPARATUS FOR MONITORING POWER GRID PARAMETERS

A system and method for measurement of one or more parameters of a power grid (10) is disclosed. This comprises determining a plurality of events in at least one power waveform on the power grid using at least two sensors (30, 50) and recording timings of the plurality of events in at least two different locations in the power grid. The data gathered is used to determine differences between the timings recorded in the at least two locations. A processing unit (40) is used to analyse the differences of the timings to determine the one or more parameters. These parameters include power flow, short circuits, and breaks in the power grid (10).

LOAD POWER DEVICE, SYSTEM AND METHOD OF LOAD CONTROL AND MANAGEMENT EMPLOYING LOAD IDENTIFICATION

A load power device includes a power input, at least one power output for at least one load, a plurality of sensors structured to sense voltage and current at the at least one power output, and a processor. The processor provides: (a) load identification based upon the sensed voltage and current, and (b) load control and management based upon the load identification.

UPDATE OF THE TOPOLOGY OF A DISTRIBUTION NETWORK BY SUCCESSIVE REATTRIBUTION OF COUNTERS

Il est proposé une méthode de correction d'une topologie d'un réseau intelligent qui exploite l'information contenu dans des mesures de tension collectées par des compteurs intelligents afin de déterminer quel compteur est rattaché à quel transformateur. La méthode préférée démarre d'une topologie initiale qui comporte potentiellement des erreurs d'attribution de compteur à transformateur et réalise des réattributions successives jusqu'à ce que chaque compteur soit attribué au réseau d'un transformateur pour lequel la tension du compteur a le plus de similarité avec la tension moyenne de ce réseau. Le calcul de similarité préféré est une optimisation de la distance entre deux signaux de tension dans un espace multidimensionnelle. La méthode comprend les étapes successives de séparer en deux lots les compteurs attribués à un transformateur selon le degré de similarité de chaque compteur avec les autres compteurs de sorte qu'un lot comprends les compteurs dit immuables car ils sont similaires ...

ELECTRICAL MEASURING SYSTEM AND METHOD FOR OPERATING THE SYSTEM

An electrical measuring system of a six-port circuit includes a delay line and a arithmetic unit. In a first operating mode, an electrical signal can be on the one hand transmitted directly to a first input terminal and on the other hand via the delay line to a second input terminal of the six-port circuit. In an embodiment, the measuring system is configured such that, in the second operating mode, it does not supply a signal to the first input terminal of the six-port circuit and it supplies a reference signal to the second input terminal of the six-port circuit.

LIGHTING PERFORMANCE POWER MONITORING SYSTEM AND METHOD WITHOPTIONAL INTEGRATED LIGHT CONTROL

A light performance monitoring device (1000) and optionally integrated co ntroller includes a monitor module (1020) that directly monitors energy usag e of at least one energy load (1050) to generate at least one measurement of energy usage, a storage module (100 stores a series of baseline values of e nergy usage of the energy load, a comparator (1000) module compares energy m easurements mad at predetermined intervals with the baseline values, and a n otification module (1025) notifies a designated recipient that there is a de viation from the baseline values consistent with a burned out or non-operati onal light fixture, including but not limited to light bulbs or ballast devi ces (1050) A control module optionally integrated with the light performance monito.pi.ng device can be operatively coupled to the monitor module to con trol energy usage by the at least one energy load via a data link in a pre-d etermmed manner that i based on the at least one measurement of energy usage .

FRACTIONAL SAMPLING OF ELECTRICAL ENERGY

... ²²A novel method and device for measuring electrical parameters in an energy ²meter in²an electrical system is described. The novel method samples an electrical ²energy signal²and determines a relevant portion of the sampled electrical energy signal. The ²relevant²portion of the electrical energy signal is then separately multiplied by a ²first and second²reference waveform. The relevant portion may be reflective of a particular ²line cycle at a²particular frequency of interest. In addition, other samples in the line cycle ²may be²accumulated. The samples whose portions may be determined may be the first ²and/or²last signal, while other sampled signals may be evaluated in whole.² ...

POWER MONITOR APPARATUS AND METHOD WITH OBJECT ORIENTED STRUCTURE

An object oriented architecture is used within individual monitoring units. The monitoring devices include circuitry which receives an electrical signal and generates at least one digital signal representing the electrical signal. Objects within such individual monitoring units include modules which perform a function and registers which contain the inputs, outputs and setup information for the modules. Methods can be invoked on all objects to change or query the operation or configuration of the device. At least one of the modules receives the digital signal as an input and uses the signal to generate measured parameters. Additional modules take measured parameters as input and generate additional parameters therefrom. The module may be linked in an arbitrary manner to form arbitrary functional blocks.

DIGITAL MEASURING INSTRUMENT FOR THE PROCESSING OF THE OF A SENSOR OF AN HARMONIC WAVE-AFFLICTED ELECTRICAL SUPPLY NETWORK DELIVERING SIMILAR OUTPUT SIGNALS.

A method of extracting electric power signals to a signal mixed feeding a plurality of distinct electrical appliances.

Linvention concerne une méthode pour extraire une pluralité de signaux de puissance électrique à partir dun signal mélangé (1) de puissance électrique alimentant une pluralité dappareils électriques distincts, chaque signal de puissance correspondant à lun des appareils électriques; la méthode comprenant: acquérir le signal mélangé; extraire une portion du signal mélangé; appliquer une décomposition (3) parcimonieuse sur la portion de manière a décomposer la portion en une pluralité datomes; appliquer une méthode de classification sur ladite pluralité datomes de manière à former des groupes datomes (4); chaque groupe datomes correspondant au signal de puissance de lun des appareils électriques; et extraire chacun des signaux de puissance électrique à partir de lun des groupes datomes (4). En outre, la méthode concerne également lestimation de la consommation de chacun des appareils électriques à partir du signal de puissance extrait pour chacun des appareils électriques. La méthode permet ...

Verfahren und Vorrichtung zur Bestimmung von Phasenfehlern bzw. Taktverzögerungen in einem Messwandler und Leistungsmessvorrichtung mit entsprechender Fehlerkorrektur.

Stromwandler werden weitläufig in Strommesssystemen verwendet. Sie liefern gute Isolation zwischen der Versorgungsspannung und dem Messgerät. Sie können jedoch kleine Phasenfehler einführen, die wesentliche Fehlerquellen werden können, falls der Strom zu einer Last (24) zu der Versorgungsspannung für die Last (24) phasenverschoben ist. Die vorliegende Erfindung betrifft eine robuste Messvorrichtung und ein Verfahren, die in situ verwendet werden können, um auf Phasenfehler zu überwachen und diese zu korrigieren. Ferner betrifft die Erfindung einen Leistungsmesser.

Methods and systems for determining vascular bodily lumen information and guiding medical devices

Methods and systems for determining information about a vascular bodily lumen are described. An exemplary method includes generating an electrical signal, delivering the electrical signal to a plurality of excitation elements in the vicinity of the vascular bodily lumen, measuring a responsive electrical signal from a plurality of sensing elements in response to the delivered electrical signal, and determining a lumen dimension. Specific embodiments include generating a multiple frequency electrical signal. Another embodiment includes measuring a plurality of responsive signals at a plurality of frequencies. Still other embodiments include using spatial diversity of the excitation elements. Yet other embodiments use method for calibration and de-embedding of such measurements to determine the lumen dimensions. Diagnostic devices incorporating the method are also disclosed, including guide wires, catheters and implants. The methods and systems described herein are advantageous as they do not include injecting a second fluid for the measurements.

Systems, Methods, and Apparatus for Detecting Theft and Status of Electrical Power

Certain embodiments of the invention may include systems, methods, and apparatus for detecting theft and status of electrical power. According to an example embodiment of the invention, a method is provided for detecting theft and status of electrical power. The method can include monitoring switch state of a main circuit breaker, monitoring load-side voltage, monitoring load current, determining one or more conditions associated with power usage based at least in part on one or more of the monitored switch state, the monitored load-side voltage, or the monitored load current and transmitting information representing the one or more determined conditions.

Method and device for determining an input voltage on a transforming station of a power network

A method and device are provided for determining an input voltage of a transformer of a local network station. The method includes measuring an input current of the transformer, an output current of the transformer, an output voltage of the transformer, and a phase angle between the output current and output voltage. The method also includes determining a translation ratio and an admittance of a cross-member of a p-equivalent circuit diagram of the transformer of the local network station using the measured input current, the measured output current, the measured output voltage and the phase angle between the output current and the output voltage. The method also includes determining the input voltage of the transformer of the local network station based on the determined translation ratio and the determined admittance of the cross-member of the p-equivalent circuit diagram.

State-matrix-independent dynamic process estimation method in real-time for weakly observable measurement nodes without pmu

A state-matrix-independent dynamic process estimation method in real-time for weakly observable measurement nodes without PMU is only dependent on real-time measurement dynamic data of measurement nodes with Phasor Mesurement Unit (PMU) and measurement data of Supervisory Control And Data Acquisition (SCADA) system in electric power system or state estimation data. According to the SCADA measurement data or state estimation data at some continuous moments, the method utilizes recursive least squares solution to find a linear combination relationship between variation of measurement parameter to be estimated of nodes without PMU and variation of corresponding measurement parameter of nodes with PMU. Using the linear combination of relationship, the dynamic process of measurement nodes without PMU is estimated in real-time. The method provides high estimation precision and meets error requirements of engineering application.

Virtual sub-metering using combined classifiers

A virtual sub-metering process using combined classifiers includes generating an electric power consumption signature database by receiving data from an electric power consumption measuring meter and auxiliary data from a building management system, and clustering the data. After the generation of the electric power consumption signature database, additional data from the electric power consumption measuring meter and the auxiliary data from the building management system is received, and this additional data is processed to generate a second steady-state load classification component. A second transient state component is extracted from the additional data. The steady-state load classification components and the transient shape components from the electric power consumption signature database, the second steady state load classification component, the second transient shape component, and control signals and status signals associated with the plurality of electric power consuming devices are correlated and combined.

Instantaneous phasor determination for poly-phase electrical grids

In one embodiment, three substantially simultaneous phase waveforms may be converted into a first quadrature signal and a zero sequence signal. For each phase waveform, a power system digital frequency may be determined through analysis of the first quadrature signal (e.g., and at least one additional prior quadrature signal) while eliminating waveform phase angles from the analysis. Subsequently, demodulation of the first quadrature signal and zero sequence signal based on the power system digital frequency results in a positive sequence phasor, a negative sequence phasor, and a zero sequence phasor.

Source Power Anomaly and Load Power Consumption Monitoring and Analysis

Power data are collected from one or more power modules that control power to a connected load. The power data may include indications of source electricity measurements and of load power consumption measurements. These measurements are correlated in space or time and a set of the correlated source electricity measurements or the correlated load power measurements is selected for presentation. The selected set of measurements is presented on a presentation device such that deviations from specified values are indicated to a user.

Method and arrangement for detecting frequency and fundamental wave component of three-phase signal

A method and arrangement for detecting a frequency of a measured three-phase voltage. The method includes measuring a three-phase voltage, forming a discrete model for a periodic signal, the discrete model including the three-phase voltage and a difference between positive and negative voltage components of the three-phase voltage, forming a discrete detector based on the discrete model, detecting a fundamental wave component of the voltage and the difference between the positive and negative voltage components of the three-phase voltage from an error between the measured voltage and detected fundamental wave component of the voltage by using the discrete detector and a sampling time together with a detected frequency of the measured voltage. The detected frequency is detected from a detected difference between positive and negative voltage components of the measured voltage and from an error between the measured voltage and the detected fundamental wave component of the voltage.

Systems and methods for use in measuring current through a conductor

Systems, methods and devices for use in measuring current through a conductor are provided. One example current device includes a first sensor configured to measure a first magnetic flux provided from a conductor and to generate a first signal proportional to the first magnetic flux, and a second sensor configured to measure a second magnetic flux provided from the conductor and to generate a second signal proportional to the second magnetic flux. The second sensor is spaced apart from the first sensor by a predetermined distance. The current device further includes a processor configured to determine, based on the first signal, the second signal and the predetermined distance, a radius between the conductor and at least one of the first sensor and the second sensor.

Apparatus and method of performing customer-designated action based on power event

A power grid event detection apparatus includes an event detection unit to detect a location of an event in a power grid, a customer location unit to determine a location of interest to an interested party, and a rule application unit to determine whether to perform an action designated by the interested party at least when the location of the event corresponds to the location of interest to the interested party.

Resampling a Signal to Perform Synchrophasor Measurement

Performing power quality and synchrophasor analysis on a resampled signal. A first signal may be initially received which corresponds to a power system. The first signal may have a plurality of cycles and may have a frequency that varies over time. One or more parameters may be determined from the first signal. Based on the one or more parameters, the first signal may be resampled to produce an even angle signal. Various power quality measurements may be performed on the even angle signal. Similarly, further processing may be performed to perform synchrophasor measurements, e.g., to determine phasor, frequency, and/or rate of frequency change for the first signal. In some embodiments, the resampling processing elements (e.g., circuitry, programmable hardware elements, processors and memories, etc.) may be shared between the two analyses.

Smart plugs, smart sockets and smart adaptors

A smart socket is provided. The smart socket has a set of power sockets, configured for a set of power pins of a smart plug to plug into, a driving pin and a set of detection pins, configured for forming a circuit with a set of feedback pins of a smart plug when the set of power pins is plugged into the power sockets, and an identification code module, configured for obtaining an identification code of an electric appliance, from the circuit, to which the smart plug belongs.

Leakage current sensor for post type insulator

A sensor apparatus for detecting leakage current in a post-type insulator of an electrical power system includes: a sensor unit having a housing, the sensor unit including: a sensor assembly operable to generate an analog signal proportional to a received leakage current; an electronics module operable to covert the analog signal to a digital value; and a communications system operable to wirelessly transmit the digital value to an external receiver; a collection band adapted to be connected to an exterior surface of the insulator; and a transfer lead interconnecting the sensor assembly and the collection band, the transfer lead operable to transfer leakage current from the insulator from the collection band to the sensor assembly.

Method for calculating primary time constant of power grid

A method for calculating a primary time constant of a power grid. It comprises the steps of: establishing an electromechanical transient model of the power grid using the widely used power system analysis software package (PSASP) according to the actual power grid parameters and network topology; establishing an electromagnetic transient model under PASAP using the actual power grid parameters for a site which requires the calculation of the primary time constant of the power grid, and setting a ground short circuit fault at the site; obtaining a transient short circuit current of the short circuit point of the power grid using a hybrid simulation method of the electromechanical and electromagnetic transient models; filtering out a periodic component in the transient short circuit current to obtain a non-periodic component attenuated with time, and finding the attenuation time constant of the non-periodic component which is the primary time constant of the power grid.

Method and device for measuring the phase-noise spectrum of a pulsed sinusoidal signal

A device for measuring the phase-noise spectrum of a pulsed sinusoidal signal generates a pulsed sinusoidal signal, converts the analog pulsed sinusoidal signal into a corresponding digital, pulsed sinusoidal signal and mixes the digital, pulsed sinusoidal signal into the baseband by means of quadrature mixing. Following this, the phase of the pulsed sinusoidal signal in the baseband is determined by means of Fourier transform of the phase of the pulsed sinusoidal signal, the phase spectrum of the pulsed sinusoidal signal is determined, and the phase-noise spectrum of the pulsed sinusoidal signal is determined by removing the spectral lines associated with the sinusoidal signal from the phase spectrum. According to the invention, the pulse pauses are removed from the pulsed sinusoidal signal in the baseband.

Leveraging inherent redundancy in a multifunction ied

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.

Apparatus and Methods Thereof for Power Consumption Measurement at Circuit Breaker Points

Apparatus and methods are provided for the measurement of power consumption at points of interest, such as circuit breakers, machines, and the like. Accordingly, means are provided for measurement of power consumption for each electrical sub-network that is controlled by a circuit breaker. Each apparatus is enabled to communicate its respective data, in an environment of a plurality of such apparatuses, to a management unit which is enabled to provide finer granularity power consumption profiles. Challenges of measuring relatively low supply currents, wireless operation in an environment of a large number of apparatuses, and self-powering are addressed.

Electric power monitoring device and an apparatus using alternating current power having the same

The present invention relates to an electric power monitoring device, and particularly to an electric power monitoring device for monitoring a quality of alternating current power. According to an embodiment of the present invention, an electric power monitoring device is provided with a first connection portion, a second connection portion and a cable that connects the first connection portion to the second connection portion and comprises a measuring unit for measuring alternating current power quality; a processing unit which is connected to the measuring unit to convert the measured power quality to data; and a display which is connected to the processing unit to display the data on a screen. The electric power monitoring device is used for an apparatus having an alternating current power input unit.

METHODS AND SYSTEMS FOR DETERMINING VASCULAR BODILY LUMEN INFORMATION AND GUIDING MEDICAL DEVICES

Methods and systems for determining information about a vascular bodily lumen are described. An exemplary method includes generating an electrical signal, delivering the electrical signal to a plurality of excitation elements in the vicinity of the vascular bodily lumen, measuring a responsive electrical signal from a plurality of sensing elements in response to the delivered electrical signal, and determining a lumen dimension. Specific embodiments include generating a multiple frequency electrical signal. Another embodiment includes measuring a plurality of responsive signals at a plurality of frequencies. Still other embodiments include using spatial diversity of the excitation elements. Yet other embodiments use method for calibration and de-embedding of such measurements to determine the lumen dimensions. Diagnostic devices incorporating the method are also disclosed, including guide wires, catheters and implants. The methods and systems described herein are advantageous as they do not include injecting a second fluid for the measurements. 1. A method for estimating electrical parameters of an electrical load network , comprising:providing an interconnecting network with known electrical parameters, where the interconnecting network connects one or more electrical sources, electrical measurement apparatus at the proximal end, and the electrical load network at the distal end;measuring an electrical response via the electrical measurement apparatus for the connected electrical load network; andde-embedding the electrical effects of the interconnecting network from the measured response to estimate the electrical parameters of the electrical load network;wherein the interconnecting network comprises more than two ports,wherein a number of unknown electrical parameters in the electrical load network does not exceed a number of ports of the electrical network.2. The method of where the electrical parameters are determined via a best fit estimate.3. The method of ...

SYSTEM FREQUENCY MEASUREMENT METHOD, SYNCHROPHASOR MEASUREMENT METHOD AND DEVICE THEREOF

Provided are a system frequency measurement method, synchrophasor measurement method and device. The synchrophasor measurement method comprises: sampling voltage and current signals based on an absolute time reference; removing out-of-band interference in the sampled voltage and current signals; first-resampling at least one of the voltage and current signals with the out-of-band interference being removed based on an estimated system frequency; calculating phasor for the signals obtained from the first resampling and updating the estimated system frequency; for a reporting timing, second-resampling the voltage and current signals with the out-of-band interference being removed based on the updated estimated system frequency; and calculating synchrophasor of the voltage and current signals obtained from the second resampling. The system frequency measurement method, synchrophasor measurement method and device are not only applicable to the stable operation of power systems but also to the dynamic operation thereof, and provide measurement result with high precision. 1. A synchrophasor measurement method , comprising:sampling voltage and current signals in a power system based on an absolute time reference;removing out-of-band interference in the sampled voltage and current signals;first-resampling at least one of the voltage and current signals with the out-of-band interference being removed based on an estimated system frequency;calculating phasor for signals obtained from the first resampling, and updating the estimated system frequency;for a reporting time, second-resampling the voltage and current signals with the out-of-band interference being removed based on the updated estimated system frequency; andcalculating synchrophasor for the voltage and current signals obtained from the second resampling.2. The synchrophasor measurement method according to claim 1 , wherein claim 1 ,the out-of-band interference in the sampled voltage and current signals is removed ...

SYSTEM AND METHOD OF MONITORING THE WAVEFORM OF THE VOLTAGE OF THE ELECTRICAL GRID

The present invention relates to a system for monitoring the electric network voltage waveform, comprising: switching means () connected to the voltage lines (A, B, C) of a three-phase system, comprising two thyristors (T T) connected to two of the voltage lines (A, B, C) and at least two capacitors (C C) connected to said thyristors (T T), said means () being configured to open and close said thyristors (T T) in response to a trigger signal; means for measuring () the voltages in said voltage lines and at the input of said capacitors; a thyristor trigger circuit () for providing a trigger signal to either thyristor (DT DT) when the voltage in the terminals of said thyristor (T T) crosses zero; control means () for giving said trigger order (OD) or not. The control means comprise: a PLL () configured to obtain an image signal from the voltage signals of said voltage lines (A, B, C), from the phase angle (φ) of the three-phase system and from the temporal variation thereof; an adaptive notch filter () for providing filtered voltage signals between the voltage lines (V, V); means for filtering the voltages at the input of the capacitors (V, V); a zero crossing detector () configured to provide said trigger order (OD). 21011121212. The system () of claim 1 , wherein said switching means () further comprise an inductor (L claim 1 , L) located between each thyristor (T claim 1 , T) and the corresponding capacitor (C claim 1 , C).3. (canceled)410232432. The system () of claim 1 , wherein said adaptive notch filter ( claim 1 , ) is an all-pass filter.510. The system () of claim 3 , wherein said all-pass filter is a planar rotation lattice filter.61013231412. The system () of claim 1 , wherein said control means ( claim 1 , ) and said thyristor trigger circuit () are configured to send the corresponding trigger signals (DT claim 1 , DT) when the following three conditions are simultaneously met:the trigger order (OD) is received;the voltage in the terminals of the thyristor ...

Matching positive transitions in a time trace disaggregation process

A method can include detecting a positive transition in a time trace disaggregation process (TTDP), creating a new instance j, capturing a positive transition data block for the instance j, creating a time trace feature description for power, reactive power, and current, and matching the instance j to a device type by performing a quick match based on at least one quick match parameters. Responsive to a positive identification based on the quick match, the instance j may be assigned to the device type.

Method for detecting a device that generates spurious signals in an electrical network, an electrical system and an aircraft

A method for detecting a device that generates spurious signals in an electrical network, to which several devices and at least one fault detection device are connected, includes the steps of monitoring the electrical network for electrical spurious signals, sequentially deactivating each device for a predetermined time T when an electrical spurious signal has been detected, and checking the electrical network for the disappearance of the respective spurious signal, and signaling as soon as the respective spurious signal has disappeared upon deactivating a respective device. This makes it possible to especially reliably detect a device in an electrical network that couples an undesired spurious signal into the network.

METHOD OF MONITORING A WIND TURBINE

A method of real-time monitoring of the operation of a wind turbine in an operational region of theoretically constant power coefficient is disclosed. The method comprises measuring the electrical power generated by the wind turbine, a representative wind speed, and an ambient temperature. The wind power available to the wind turbine for a given moment in time may be calculated based on the measured ambient temperature and measured representative wind speed. The aerodynamic power captured by the wind turbine at the same moment in time may be determined based on the measured electrical power generated. And the practical power coefficient may be calculated by dividing the aerodynamic power captured by the calculated available wind power. 1. A method of real-time monitoring of the operation of a wind turbine in an operational region of theoretically constant power coefficient , the wind turbine having a rotor with a plurality of rotor blades and a generator ,the method comprising:measuring electrical power generated by the wind turbine, a representative wind speed, and an ambient temperature;calculating wind power available to the wind turbine at a moment in time based on the measured ambient temperature and the measured representative wind speed;determining aerodynamic power captured by the wind turbine at substantially the same moment in time based on the measured electrical power generated; andcalculating a practical power coefficient by dividing the aerodynamic power captured by the calculated available wind power.2. The method of claim 1 , wherein the representative wind speed is measured by an anemometer based on a nacelle of the wind turbine.3. The method of claim 1 , wherein the aerodynamic power captured by the wind turbine is calculated using a generator losses model representative for losses in the generator and/or a drive train losses model representative for losses in the drive train and/or a power converter losses model representative for losses in the ...

An appliance operation signal processing system and method

An appliance operation signal processing system including an input for receiving an appliance operation signal. The appliance operation signal includes information relating to operation of an appliance. The system further includes an output for outputting information relating to degradation of the appliance and a processor configured to determine a probability that the appliance or a component of the appliance is in at least one degradation state by applying a classifier to a feature vector including information relating to frequency data extracted from the appliance operation signal.

SYSTEM FOR ACCURATELY DETERMINING AN AMOUNT OF ELECTRICAL CURRENT FLOWING THROUGH A HALL EFFECT CURRENT SENSOR

A system for accurately determining an amount of electrical current flowing through a Hall effect current sensor is provided. The system includes a microcontroller that determines a smoothed electrical current offset value based on an average measured apparent electrical current value, an electrical current offset smoothing coefficient, a prior smoothed electrical current offset value, and a prior electrical current offset trend value. The microcontroller determines an electrical current offset trend value associated with the Hall effect current sensor based on the smoothed electrical current offset value, an electrical current offset trend smoothing coefficient, a prior smoothed electrical current offset value, and the prior electrical current offset trend value. 1. A system for accurately determining an amount of electrical current flowing through a Hall effect current sensor , comprising:a microcontroller operably coupled to the Hall effect current sensor;the microcontroller determining an average measured apparent electrical current value based on an electrical current output signal from the Hall effect current sensor, before an electrical current is flowing through the Hall effect current sensor;the microcontroller determining a smoothed electrical current offset value based on the average measured apparent electrical current value, an electrical current offset smoothing coefficient, a prior smoothed electrical current offset value, and a prior electrical current offset trend value; andthe microcontroller determining an electrical current offset trend value associated with the Hall effect current sensor based on the smoothed electrical current offset value, an electrical current offset trend smoothing coefficient, a prior smoothed electrical current offset value, and the prior electrical current offset trend value.2. The system of claim 1 , wherein:the microcontroller determining an updated measured apparent electrical current value based on the electrical ...

NEUTRAL CONNECTION DETECTION METHOD FOR 3/4 -WIRE ACTIVE FILTERS

Aspects of the present disclosure are directed to a power filter comprising a first input configured to receive measurements of electrical characteristics of source power lines from a power source, a second input configured to receive measurements of electrical characteristics of load power lines to a load, an output configured to couple to output power lines to provide output current compensation signals, a power converter coupled to the power output and configured to receive input power, receive input control signals and provide the output current compensation signals based on the input control signals, and control circuitry coupled to the first input, the second input and the power converter and configured to provide the control signals to the power converter, wherein the control circuitry is configured to detect a connection status of a neutral connection to the load, wherein the connection status includes one of connected and disconnected. 1. A power filter comprising:a first input configured to receive measurements of electrical characteristics of source power lines from a power source, wherein the source power lines include a first phase line, a second phase line, a third phase line and a neutral;a second input configured to receive measurements of electrical characteristics of load power lines to a load, wherein the load power lines include a first phase line, a second phase line, a third phase line and a neutral;an output configured to couple to output power lines to provide output current compensation signals, wherein the output power lines include a first phase line, a second phase line, a third phase line and a neutral;a power converter coupled to the power output and configured to receive input power, receive input control signals and provide the output current compensation signals based on the input control signals; andcontrol circuitry coupled to the first input, the second input and the power converter and configured to provide the control signals to ...

Method for Aggregating Operating Values of a Plurality of Spatially Distributed Operating Units, and Monitoring Device for Carrying out the Method

A method for aggregating operating values of a plurality of spatially distributed operating units, wherein aggregation times are predefined and the operating values of each operating unit describe an operating variable at each of the respective aggregation times, and a respective aggregation value is generated from time-synchronized operating values of the operating units for the aggregation. Respective raw values are received for each of the operating units, which describe the operating variable at a respective detection time, and the operating values of at least one of the operating units are formed based on the raw values thereof. For each of the aggregation times, and based on a predetermined checking function, a respective operating value is sought which fulfills a synchronization criterion and a plausibility criterion. If an operating value of this type is found it is used, and if no such operating value is found, a detection gap is signaled. 1. A method for aggregating operating values of a plurality of spatially distributed operating units , wherein , by way of a monitoring apparatus: 'wherein the respective operating values of each of the plurality of spatially distributed operating units describe an operating variable of a respective one of the plurality of spatially distributed operating units at each of the respective consecutive aggregation times;', 'predefining an aggregation clock composed of consecutive aggregation times,'}generating a respective aggregation value from respective time-synchronized operating values of the plurality of spatially distributed operating units using a predetermined aggregation function for aggregation of the operating values of the plurality of spatially distributed operating units; 'wherein the operating values of at least one of the plurality of spatially distributed operating units are formed based on respective raw values of such operating values by virtue of, for each of the consecutive aggregation times, in each case ...

METHOD OF DETERMINING MUTUAL VOLTAGE SENSITIVITY COEFFICIENTS BETWEEN A PLURALITY OF MEASURING NODES OF AN ELECTRIC POWER NETWORK

The method for determining mutual voltage sensitivity coefficients between a plurality of measuring nodes of an electric power network does not rely on knowledge of the network parameters (for example: series conductance and susceptance of the branches, shunt conductance and susceptance of the nodes, etc.). The method uses a monitoring infrastructure including metering units at each one of the measuring nodes, and includes a step of measuring at the same time, at each one of the measuring nodes, repeatedly over a time window, sets of data including values of the current, the voltage, and the phase difference, a step of computing active power, reactive power and values from each set of measured data, and a step of performing multiple parametric regression analysis of the variations of the voltage at each one of the measuring nodes. 11717. A method for determining mutual voltage sensitivity coefficients between a plurality of measuring nodes (M , . . . , M) of an electric power network () , the electric power network being provided with a monitoring infrastructure comprising metering units at each one of said measuring nodes , for measuring a voltage , a current and a phase difference between the voltage and the current , locally , the monitoring infrastructure comprising a processing unit () connected to a communication network , the metering units being connected to the communication network so as to allow for data transmission to and from the processing unit; the method comprising the steps of:{'b': 1', '7, 'sub': 1', 'm, 'I. measure at the same time, at each one of said measuring nodes (M, . . . , M), repeatedly over a time window (τ), sets of data comprising values of the current (Ĩ(t)), the voltage ({tilde over (V)}(t), and the phase difference (φ(t)), timestamp (t ϵ{t, . . . , t}) the sets of measured data, and compute a timestamped active power value ({tilde over (P)}(t)) and a timestamped reactive power value ({tilde over (Q)}(t)) from each set of measured ...

System and Method for Estimating a Periodic Signal

In accordance with an embodiment, a method of reconstructing a periodic signal includes receiving random electronic samples of the periodic signal from a sensing circuit, sorting, by a processor, the electronic samples in a sequential order to form ordered samples, and estimating, by the processor, a shape of the periodic signal based on the ordered samples

Electrical circuit control in power systems

Electrical circuit control techniques in power systems are disclosed herein. In one embodiment, a supervisory computer in the power system can be configured to fit phasor measurement data from phasor measurement units into a Gaussian distribution with a corresponding Gaussian confidence level. When the Gaussian confidence level of the fitted Gaussian distribution is above a Gaussian confidence threshold, the supervisory computer can be configured to perform an ambient analysis on the received phasor measurement data to determine an operating characteristic of the power system. The supervisory computer can then automatically applying at least one electrical circuit control action to the power system in response to the determined operating characteristic.

PRIMARY POWER GRID FREQUENCY RESPONSE CHARACTERIZATION USING PHASOR MEASUREMENT UNIT DATA

The technology is generally directed towards characterizing primary frequency response parameters (e.g., frequency response coefficient, inertia, damping, droop) for an interconnection, region, and power plant utilizing phasor measure unit (PMU) data captured during an event (e.g., a generation trip event) that causes an imbalance in the power grid system. Pre-processing of localized PMU based frequency measurements combined with system identification techniques fit the observed frequency response to estimate parameters such as system inertia, frequency response coefficient, turbine time constant, system damping and governor droop that characterize the interconnection-wide frequency response. 1. A method , comprising:detecting, by a system comprising a processor, a change in power in a power grid system that changes a frequency associated with the power grid system; and establishing, based on measurement data associated with the power grid, a boundary region for a frequency response of the power grid system; and', 'varying at least one transfer function parameter value of a transfer function that relates the change in power to the change in frequency until the frequency response is within the boundary region., 'in response to the detecting the change in power2. The method of claim 1 , further comprising claim 1 , determining a system response value of the power grid system based on the measurement data claim 1 , and using the system response value to obtain transfer function parameter values of the transfer function.3. The method of claim 2 , wherein the determining the system response value comprises estimating dynamic response parameter values from the measurement data and a change in power value representing the change in power.4. The method of claim 1 , wherein the determining the system response value comprises computing the system response value based on a first value representative of system droop and a second value representative of system damping.5. The ...

MOUNTING SYSTEM FOR SENSORS ON ELECTRICAL POWER LINES

A system for monitoring current and voltage from a power source or load at the tap wire connected to an overhead distribution power line, the distribution power line being spaced apart from the ground is provided. The system includes a current clamp sensor coupled to the tap wire and spaced apart from the distribution power line. A sensor is insulated body coupled to the current clamp, the sensor body being configured to simultaneously measure voltage on the overhead distribution power line and current of the tap wire prior to the distribution power line. A mounting assembly is provided that suspends the sensor from the distribution power line, the mounting assembly being coupled between the distribution power line and the current clamp. 1. A system for monitoring current and voltage from a power source , the system comprising:a power source configured to generate electrical power;a first power line electrically coupled to the power source at a first end, the first power line having a first portion disposed underground and a second portion;a primary electrical distribution system spaced apart from the ground, the primary electrical distribution system having a second power line, wherein the second portion is electrically coupled to the second power line;a sensor electrically coupled to the second power line, operably coupled to the second portion, and configured to simultaneously measure voltage and current of the second portion; and a first hot line clamp configured to couple with the second portion;', 'a first spacer member having a length coupled to the first hot line clamp;', 'a plate coupled to between the sensor and the first spacer member; and', 'a current clamp coupled to the plate and operably coupled between the sensor and the second portion., 'a mounting system that suspends the sensor from the second power line, the mounting system comprising2. The system of claim 1 , further comprising a tap wire having a first end and a second end claim 1 , the first ...

LOW LOSS ACOUSTIC WAVE SENSORS AND TAGS AND HIGH EFFICIENCY ANTENNAS AND METHODS FOR REMOTE ACTIVATION THEREOF

Enhanced surface acoustic wave (SAW) sensors and SAW sensor-tag wireless interface devices, including low loss devices, devices that enable enhanced use of time diversity for device identification, and devices suitable for use in band-limited environments (such as ISM band) and for use in ultra-wideband applications are disclosed. Antennas for use with both SAW sensors and/or tags, and wireless transceiver systems also are disclosed, including antennas suitable for operation in conductive media and in highly metallic environments, said antennas being used to activate and read said SAW sensors and/or tags. SAW sensors and sensor-tags and related methods for measuring scaled voltage and current in electrical conductors via measurements of the electric and magnetic fields thereof are disclosed. 1. An apparatus for wirelessly measuring the strength of electric and/or magnetic fields , comprising:one or more acoustic wave sensor or sensor-tag devices;at least one transistor;at least one field probe operable to interact with the field being measured and produce a voltage; andone or more antennas.2. An apparatus for wirelessly measuring the strength of electric and/or magnetic fields according to claim 1 , wherein said transistor is a field effect transistor (FET).3. An apparatus for wirelessly measuring the strength of electric and/or magnetic fields according to claim 2 ,wherein the drain and source of said FET are electrically connected to at least one transducer on said one or more acoustic wave devices; andwherein the voltage produced by said at least one field probe is applied to the FET gate.4. An apparatus according to for wirelessly measuring the strength of the electric field around a conductor carrying an AC voltage claim 1 ,wherein said at least one field probe comprises two conductive objects located at different radial distances from the conductor.5. An apparatus according to for wirelessly measuring the strength of the magnetic field around a conductor ...

AUTOMATIC GENERATION AND ANALYSIS OF SOLAR CELL IV CURVES

A photovoltaic system includes multiple strings of solar panels and a device presenting a DC load to the strings of solar panels. Output currents of the strings of solar panels may be sensed and provided to a computer that generates current-voltage (IV) curves of the strings of solar panels. Output voltages of the string of solar panels may be sensed at the string or at the device presenting the DC load. The DC load may be varied. Output currents of the strings of solar panels responsive to the variation of the DC load are sensed to generate IV curves of the strings of solar panels. IV curves may be compared and analyzed to evaluate performance of and detect problems with a string of solar panels. 1. A method of evaluating performance of solar panels , the method comprising:selectively providing power to a first current sensor in a plurality of current sensors, wherein the plurality of current sensors comprises Hall Effect field sensors;sensing, using the first current sensor while providing power to the first current sensor, current generated by a first string of solar panels in a plurality of strings of solar panels to generate a sensed current;selectively providing power to a second current sensor in the plurality of current sensors instead of providing power to the first current sensor;sensing, using the second current sensor while providing power to the second current sensor, current generated by a second string of solar panels in the plurality of strings of solar panels; andevaluating a performance of the first string of solar panels using the sensed current.2. The method of claim 1 , further comprising:sensing a solar insolation on the first string of solar panels at a first instance;sensing a voltage generated by the first string of solar panels at the first instance; andgenerating a current-voltage (IV) curve of the first string of solar panels at the first instance.3. The method of claim 2 , further comprising:sensing a solar insolation on the first string ...

Harmonics Measurement in Power Grids

The subject-matter relates to a method, performed by at least one apparatus, including: determining of a correction factor for at least one first voltage transformer arranged in a power grid, the correction factor being indicative of a correction for obtaining correct measured values measured by the at least one first voltage transformer, wherein the determining of the correction factor of the at least one first voltage transformer being performed at least partially based on a first measured voltage of the at least one first voltage transformer and a second measured voltage of the at least one first voltage transformer, wherein the second voltage of the at least one first voltage transformer is determined at least partially based on a known transfer function of at least one second voltage transformer and the first voltage of the at least one first voltage transformer is determined without taking into account the known transfer function of the at least one second voltage transformer; determining a calibration factor for the at least one first voltage transformer based at least in part on the determined correction factor; and outputting or causing the output of the determined calibration factor. The subject matter further relates to a correspondingly configured apparatus and a system. 1. A method performed by at least one apparatus , comprising:determining of a correction factor for at least one first voltage transformer arranged in a power grid, the correction factor being indicative of a correction for obtaining correct measured values measured by the at least one first voltage transformer, wherein the determining of the correction factor of the at least one first voltage transformer being performed at least partially based on a first measured voltage of the at least one first voltage transformer and a second measured voltage of the at least one first voltage transformer, wherein the second measured voltage of the at least one first voltage transformer is determined ...

ESTIMATION OF A WAVEFORM PERIOD

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 ...

Systems and Methods for Monitoring Transformers and Performing Actions Based on the Monitoring

A transformer monitoring system that has one or more monitoring devices coupled to respective distribution transformers, and the monitoring devices each have a network device. The network devices monitor operational data of their respective distribution transformer and perform a monitoring device action based upon the operational data monitored. Further, the monitoring device transmits operational data and data indicative of the monitoring device action via the network device. The system also has a central computing device communicatively coupled to the one or more monitoring devices via the network devices and there is a processor resident on the central computing device that receives the operational data and the data indicative of the monitoring device action, interprets the received data, and performs an action based upon the operational data and the data indicative of the monitoring device action.

AN ELECTRIC POWER SYSTEM AND METHOD FOR MONITORING THE SAME

An electric power system comprises recording devices (-) located at different elements of the electric power system and configured to record waveform samples of quantities related to operation of the elements of the electric power system. The electric power system comprises a central device () configured to receive the recorded waveform samples from the recording devices. The recording devices are synchronized to maintain a common clock time and to associate, to each of the recorded waveform samples, one or more timing values indicative of the clock time during recording the waveform sample. As the timing values are associated to the waveform samples, it is possible to reconstruct a time order of phenomena indicated by the recorded waveform samples. Thus, it is possible to identify which of the phenomena are causes and which are consequences when analyzing for example what happened prior to a fault situation. 2. The electric power system according to claim 1 , wherein the central device is configured to control claim 1 , based on the timing values associated to the recorded waveform samples claim 1 , a display screen to display the recorded waveform samples on a same time axis.3. The electric power system according to claim 1 , wherein the recording devices are configured to record the waveform samples according to a loop recording mode where new data is recorded by overwriting corresponding old data recorded a predetermined amount of time earlier.4. The electric power system according to claim 3 , wherein:one or more of the recording devices are configured to detect one or more predefined events capable of occurring within the electric power system, andthe recording devices are configured to continue, after detection of one of predefined events, recordings of the waveform samples for a time period shorter than the predetermined amount of time and to stop the recordings after the time period.5. The electric power system according to claim 1 , wherein one or more of ...

DYNAMIC TOLERANCE CURVES FOR POWER MONITORING SYSTEMS

A method for managing power quality events in an electrical system includes processing electrical measurement data captured by an intelligent electronic device (IED) to identify at least one power quality event associated with one or more loads monitored by the IED. The IED and the loads are installed at respective locations in the electrical system. The method also includes determining an impact of the at least one identified power quality event on one or more of the loads, and using the at least one identified power quality event and the determined impact to generate a tolerance curve associated with the one or more of the loads. The tolerance curve characterizes a tolerance level of the loads to certain power quality events. The loads can include one or more loads “downstream” from the IED in the electrical system and/or one or more loads “upstream” from IED in the electrical system. 1. A method for managing power quality events in an electrical system , the method comprising:processing electrical measurement data from voltage and/or current signals captured by an intelligent electronic device (IED) to identify at least one power quality event associated with one or more loads monitored by the IED, wherein the IED and the loads are installed at respective locations in the electrical system;determining an impact of the at least one identified power quality event on one or more of the loads; andusing the at least one identified power quality event and the determined impact of the at least one identified power quality event to generate or update a tolerance curve associated with the one or more of the loads, wherein the tolerance curve characterizes a tolerance level of the loads to certain power quality events.2. The method of claim 1 , wherein using the at least one identified power quality event and the determined impact of the at least one identified power quality event to generate or update a tolerance curve associated with the one or more of the loads claim 1 ...

Systems and methods for characterizing power quality events in an electrical system

A method for quantifying power quality events in an electrical system including a plurality of intelligent electronic devices (IEDs) includes processing electrical measurement data from or derived from energy-related signals captured by at least one first IED of the plurality of IEDs to identify a power quality event at a first point of installation of the at least one first IED in the electrical system. An impact of the power quality event at a second point of installation in the electrical system is determined based on an evaluation of electrical measurement data from or derived from energy-related signals captured by at least one second IED of the plurality of IEDs at the second point of installation proximate to a determined time of occurrence of the power quality event at the first point of installation.

Low Cost LF Driver Current Sense Topology

A switching amplifier circuit () connected to drive an impedance-based output load () includes high side and low side switches (-) configured and connected to connect first and second supply voltage lines to first and second output nodes (ANTP, ANTN) in response to gating control signals, and also includes an output current sensing circuit for measuring a current through the output load with a current sensing resistor (Rs) connected between the second supply voltage line and a source of one or more split gate-source switching transistors (C) in the low side gate-source switching transistor, where a voltage sense circuit connected across the current sensing resistor is configured to sample a voltage across the current sensing resistor for measuring a sense current at the current sensing resistor. 1. A switching amplifier circuit comprising:an output driving circuit comprising a high side switching transistor and low side split gate-source switching transistor connected in series between first and second supply voltage lines;a switch driver circuit configured to drive the switching transistors with first and second respective control signals;an output connection between the switching transistors for driving an output load; andan output current sensing circuit for measuring a current through the output load with a current sensing resistor connected between the second supply voltage line and a source of one or more split gate-source switching transistors in the low side split gate-source switching transistor, wherein the one or more low side split gate-source switching transistors comprises a current sense transistor having a drain node directly connected to the output connection, a source node connected to the current sensing resistor, and a gate node, the gate node of the current sense transistor connected by a connection switch to a shared gate control signal in a first connection state and to the source node of the current sense transistor in a second connection ...

FORCED OSCILLATION SOURCE LOCATION DETERMINATION BASED ON OSCILLATION MODE ANGLE ANALYSIS USING SYNCHROPHASOR DATA

A method includes performing by a processor: receiving a plurality of synchrophasor measurements of a power system signal associated with a time interval from a plurality of phasor measurement units (PMUs), respectively, each of the plurality of synchrophasor measurements including a phase angle, frequency value, and a timestamp associated with the synchrophasor measurement; determining, for each of the plurality of PMUs, a dominant mode frequency of a forced oscillation signal component of the power system signal based on the frequency value and the phase angle; determining, for each of the plurality of PMUs, a mode angle of the forced oscillation signal component at the dominant mode frequency; and determining a geographic forced oscillation source location for a source of the forced oscillation signal component based on the plurality of mode angles associated with each of the plurality of PMUs, respectively, and geographic locations of the plurality of PMUs. 1. A method comprising:performing by a processor:receiving a plurality of synchrophasor measurements of a power system signal associated with a time interval from a plurality of phasor measurement units (PMUs), respectively, each of the plurality of synchrophasor measurements including a phase angle, frequency value, and a timestamp associated with the synchrophasor measurement;determining, for each of the plurality of PMUs, a dominant mode frequency of a forced oscillation signal component of the power system signal based on the frequency value and the phase angle;determining, for each of the plurality of PMUs, a mode angle of the forced oscillation signal component at the dominant mode frequency; anddetermining a geographic forced oscillation source location for a source of the forced oscillation signal component based on the plurality of mode angles associated with each of the plurality of PMUs, respectively, and geographic locations of the plurality of PMUs.2. The method of claim 1 , wherein determining ...

METHODS AND SYSTEMS FOR DETERMINING RESISTANCE OF POWER CONDUCTORS

Methods of powering a radio that is mounted on a tower of a cellular base station are provided in which a direct current (“DC”) power signal is provided to the radio over a power cable and a voltage level of the output of the power supply is adjusted so as to provide a substantially constant voltage at a first end of the power cable that is remote from the power supply. Related cellular base stations and programmable power supplies are also provided. 1. A system , comprising:a power supply comprising an output configured to be coupled by power conductors to a direct current (DC) power input of a radio; and provide a first DC voltage level at the output of the power supply;', 'when providing the first DC voltage level at the output of the power supply, then measure a first direct current level flowing through the output of the power supply;', 'provide a second DC voltage level at the output of the power supply;', 'when providing the second DC voltage level at the output of the power supply, then measure a second direct current level flowing through the output of the power supply, wherein the second DC voltage level differs from the first DC voltage level; and', 'determine a resistance of the power conductors using the first DC voltage level, the second DC voltage level, the first direct current level, and the second direct current level., 'wherein, when the DC power input of the radio draws a constant power level through the power conductors, the power supply is configured to3. The system of claim 1 , wherein the power supply is further configured to determine the resistance of the power conductors using at least three sets claim 1 , wherein each set comprises a DC voltage level provided at the output of the power supply and a direct current level flowing through the output of the power supply when providing the DC voltage level at the output of the power supply claim 1 , wherein each DC voltage level of each set is different.5. The system of claim 1 , further ...

On-chip current sensing employing power distribution network voltage de-convolution

Systems, methods, and other embodiments are disclosed that are configured to provide on-chip current sensing by employing a power distribution network voltage de-convolution technique. A voltage signal on a voltage plane of a system-on-chip device is measured during operation of the system-on-chip device. The voltage signal derives from a power distribution network. The voltage signal is de-convolved, based at least in part on inverse convolution coefficients derived from the power distribution network, to recover a current signal being drawn by the system-on-chip device from the power distribution network.

INTELLIGENT ELECTRONIC DEVICE WITH ENHANCED POWER QUALITY MONITORING AND COMMUNICATION CAPABILITIES

An intelligent electronic device (IED) has enhanced power quality and communications capabilities. The power meter can perform energy analysis by waveform capture, detect transient on the front end voltage input channels and provide revenue measurements. The power meter splits and distributes the front end input channels into separate circuits for scaling and processing by dedicated processors for specific applications by the power meter. Front end voltage input channels are split and distributed into separate circuits for transient detection, waveform capture analysis and revenue measurement, respectively. Front end current channels are split and distributed into separate circuits for waveform capture analysis and revenue measurement, respectively. 1a voltage input circuit operative to sense line voltage from the AC power system and generate at least one voltage signal representative of the voltage sensed from the AC power system;at least one analog-to-digital converter circuit configured to sample the at least one voltage signal to output digital samples representative of said voltage input circuit;at least one processor operatively coupled to said analog-to-digital converter and configured to perform at least one mathematical computation on samples received from the analog-to-digital converter; andat least one volatile memory operatively coupled to said at least one processor to receive samples from the analog-to-digital converter;wherein the at least one processor is configured to trigger a recording and storing in non-volatile memory at least one of said digital samples based on an algorithm that includes at least one of an adaptive trigger, a waveshape trigger and a rate of change trigger.. An intelligent electronic device (IED) for recording at least one waveform of an AC power system, the IED comprising: This application is a continuation application of U.S. patent application Ser. No. 12/080,479, filed Apr. 3, 2008, which is a continuation-in-part ...

Sensors for power distribution network and electrical grid monitoring system associated therewith

A system of sensors associated with a branched conductor of an AC power line using the conductor as the communication medium between different sensors. The communication is carried out at frequencies higher than the powerline frequency. At least one sensor is provided in every branch in the vicinity of every branching point of the conductor. Synchronous measurements are carried out of the root mean square current passing through every branch of the conductor and the direction of energy flow in the branch. Results of the measurements are regularly reported throughout the system. An arrangement is provided for analyzing the results of the measurements to determine the graph topology of the branched conductor and ascertain the distribution of the root mean square current passing through every branch of the graph.

DEVICE AND METHOD FOR HARVESTING ENERGY FROM A POWER LINE MAGNETIC FIELD

An energy harvesting device (CTH) installed in an electrical distribution system (EDS) for powering ancillary electrical devices (AD) used in the distribution system. The device includes a first voltage regulator circuit (CC) configured to produce a voltage matched to a power curve of a current transformer (CT) to which the device is electrically coupled. The device also includes a second and separate voltage regulator circuit (SVR) which continuously operates to maximize the amount of electrical energy recovered from the current transformer. 116-. (canceled)17. An energy harvesting device for harvesting electrical energy from an electrical conductor within an electrical distribution system , the device comprising:a current transformer in electrical communication with the electrical conductor and configured to convert magnetic flux from the flow of alternating current though the electrical current into a first current;a first voltage regulator configured to receive the first current and produce a first voltage;a second voltage regulator separate from the first voltage regulator, and configured to operate continuously to maximize the amount of electrical energy recovered from the current transformer by adjusting the first voltage level.18. The device of claim 17 , wherein the second voltage regulator is configured to adjust the first voltage in one or more pre-determined steps to maximize the amount of electrical energy recovered from the current transformer.19. The device of claim 17 , further comprising a microcontroller configured to control the second voltage regulator to adjust the first voltage level.20. The device of claim 17 , wherein the second voltage regulator includes a switching regulator which converts the first current into a second voltage level configured to power one or more ancillary electrical devices associated with the energy harvesting device.21. The device of claim 17 , further comprising an energy storage device for storing the recovered ...

MAINTAINING CONNECTIVITY INFORMATION FOR METERS AND TRANSFORMERS LOCATED IN A POWER DISTRIBUTION NETWORK

Methods for verifying and updating connectivity information in a geographic information system may consider location information for meters and transformers and voltage data obtained by the meters. Meters that are incorrectly associated with a transformer may be flagged and candidate transformers may be evaluated to identify a correct association. The analysis may consider voltage data from multiple meters to determine correlation values. Correlation values or confidence factors may be used to identify a transformer for the correct association. 1. A method for analyzing voltage data to maintain an association between a transformer and a meter , comprising:selecting a group of transformers that includes a selected transformer and a plurality of additional transformers, wherein the additional transformers are located within a predetermined geographic distance of the selected transformer;selecting a set of meters using connectivity information, wherein each meter is associated with one of the transformers in the group of transformers and the connectivity information associates a selected meter with the selected transformer;determining a voltage profile for each meter using measured voltages for interval periods within a predetermined time range; and comparing the voltage profile for the selected meter with voltage profiles for the remaining meters in the set of meters to generate a plurality of correlation coefficients;', 'identifying from the remaining meters a first meter that has a maximum correlation coefficient with respect to the selected meter;', 'identifying a first transformer associated with the first meter as a candidate transformer for the selected meter;', 'identifying a second set of meters from the set of meters that is associated with the candidate transformer based on the connectivity information;', 'comparing the voltage profile for the selected meter with voltage profiles for the second set of meters to generate a second plurality of correlation ...

Device And Method For Detecting High-Voltage Power Distribution Line Path Having Improved Stability

In an exemplary embodiment of the present disclosure for solving the problem, disclosed is a stability-improved high voltage power line path exploration apparatus. The stability-improved high voltage power line path exploration apparatus for tracking a high voltage power line and determining a buried path and a connection configuration up to a final power source of a power distribution system, wherein the high voltage power line is connected to a primary winding of a distribution transformer to supply voltage and current, wherein the distribution transformer converts high voltage for distribution to low voltage in proportion to a ratio of a winding combination may include: an exploration current generator for generating a current pulse signal in inverse proportion to a winding ratio for detecting a magnetic field signal around the high voltage power line, in which the exploration current generator is connected to a secondary winding of the distribution transformer; a buried path probe for tracking the buried path and connection configuration of the high voltage power line by detecting the magnetic field signal which is generated around the high voltage power line when the current pulse signal flows through the high voltage power line; and a reverse current limiter for suppressing a generation of a reverse magnetic field generated by an external conductor of the high voltage power line, to improve a reception performance of the buried path probe.

VOLTAGE STABILITY ASSESSMENT, CONTROL AND PROBABILISTIC POWER FLOW BASED ON MULTI-DIMENSIONAL HOLOMORPHIC EMBEDDING TECHNIQUES

A multi-dimensional holomorphic embedding method for voltage control of an AC power system includes embedding multiple independent symbolic variables representing multiple control elements of the AC power system into AC power flow equations that describe the AC power system, analytically solving voltages for targeted buses of the AC power system in a form of multivariate power series or multivariable Padé approximants about the multiple independent symbolic variables such that coefficients of the multivariate power series or multivariable Padé approximants are obtained non-iteratively, and jointly adjusting the multiple control elements according to the multivariate power series or multivariable Padé approximants to control voltages of the targeted buses. 1. A multi-dimensional holomorphic embedding method for voltage control of an AC power system: embedding multiple independent symbolic variables representing multiple control elements of the AC power system into AC power flow equations that describe the AC power system,', 'analytically solving voltages for targeted buses of the AC power system in a form of multivariate power series or multivariable Padé approximants about the multiple independent symbolic variables such that coefficients of the multivariate power series or multivariable Padé approximants are obtained non-iteratively, and', 'jointly adjusting the multiple control elements according to the multivariate power series or multivariable Padé approximants to control voltages of the targeted buses., 'by one or more processors,'}2. The multi-dimensional holomorphic embedding method of further comprising performing probabilistic power flow analysis on status of the AC power system based on the multivariate power series.3. The multi-dimensional holomorphic embedding method of claim 2 , wherein the multiple independent symbolic variables are input random variables describing power injections to the AC power system claim 2 , further comprising deriving cumulants ...

SYSTEM AND METHOD FOR DISTRIBUTED, SECURE, POWER GRID DATA COLLECTION, CONSENSUAL VOTING ANALYSIS, AND SITUATIONAL AWARENESS AND ANOMALY DETECTION

A system and method for data collection and aggregation using a distributed network of communications enabled sensors connected to another primary network to achieve a secondary out-of-band monitoring perspective, for example, in power grids. The data collection system includes an aggregation and processing server configured to collect data from a variety of sensors adjacent to the monitored network each sensor includes secondary power such that it can continue data transmission even during power grid outages. The data collection system includes a method for secure real-time data ingest, machine learning enabled analysis, risk assessment, and anomaly detection on a broad geographic scale irrespective of isolated network boundaries. 1. A system for power grid data collection via an adjacent network , comprising:a geographically dispersed network of independently powered and communication enabled sensing devices electrically coupled with a power grid, communicatively coupled with a communication network, and configured to sense a metric from the power grid and transmit data associated with the sensed metric to a power grid metric data processor.2. The distributed data collection network of claim 1 , wherein said sensors are supplied with a back-up power supply such that they may continue measurements and reporting when conventional power grid is unavailable or unreliable.3. The disturbed data collection network of claim 1 , wherein said sensors are configured to send sensor readings the cloud-based application when requested.4. A system for real-time data collection via an adjacent network with secondary power supply claim 1 , comprising:a network of independently powered and communication enabled sensing devices electrically coupled with a power grid, communicatively coupled with a communication network, and configured to sense a metric from the power grid and transmit data associated with the sensed metric to a power grid connected data processor.5. A sensor for ...

Mobile electric field sensor based phasor measurement unit for monitoring an electric power grid

A system may include an electric field sensor, an analog to digital converter, and an estimator. The electric field sensor may measure electric fields of electric power grid. The analog to digital converter may generate digital output based upon measurements from the electric field sensor. The estimator may estimate phasor data of the electric power grid based upon the digital output.

POWER CABLE MEASUREMENT DEVICE AND MEASUREMENT METHOD THEREOF

A power cable measurement device is provided, which may include a casing, a plurality current sensing modules and a plurality of voltage sensing modules. The casing may be used to envelope a three-phase three-wire power cable. The voltage sensing modules and the current sensing modules may be disposed on the casing and spaced at regular intervals; any two adjacent current sensing modules may be divided by one voltage sensing module. The power cable measurement device can accurately estimate the electricity information of the three-phase three-wire power cable according to a characteristic curve database constructed by pre-measurement, the induced voltages of the voltage sensing modules and the induced voltages of the current sensing modules. 1. A power cable measurement device , comprising:a casing, being hollow and cylindrical in shape, and being used to envelope a three-phase three-wire power cable;a plurality of current sensing modules, being disposed on the casing and spaced at regular intervals; anda plurality of voltage sensing modules, being disposed on the casing and spaced at regular intervals; any two adjacent voltage sensing modules are divided by one current sensing module.2. The power cable measurement device of claim 1 , wherein the three-phase three-wire power cable comprises three copper core cables claim 1 , and a position of each of the current sensing modules is corresponding to a center of two of the copper core cables.3. The power cable measurement device of claim 2 , wherein a position of each of the voltage sensing modules is corresponding to one of the copper core cables.4. The power cable measurement device of claim 1 , wherein the casing comprises an upper casing and a lower casing claim 1 , and two sides of the upper casing are respectively connected to two sides of the lower casing via a shaft.5. The power cable measurement device of claim 1 , wherein the casing comprises a plurality of slots claim 1 , and the voltage sensing modules and ...

ELECTRICAL LOAD MANAGEMENT METHOD AND APPARATUS

An electrical load management system for a vehicle power supply system having a high voltage network and a low voltage network coupled to each other by a DC-DC converter includes a controller for controlling one or more high voltage vehicle electrical systems connected to the high voltage network and one or more low voltage vehicle electrical systems connected to the low voltage network. The controller has at least one processor that receives command signals for the high and low voltage vehicle electrical systems, and a memory device having instructions stored therein. The at least one processor is configured to determine a first electrical load on the high voltage network and a second electrical load on the low voltage network in dependence on the command signals and to control operation of the high and low voltage vehicle electrical systems in dependence on the determined first and second electrical loads. 1. An electrical load management system for a vehicle power supply system (PSS) having a high voltage network (NHV) and a low voltage network (NLV) coupled to each other by a DC-DC converter , wherein the electrical load management system comprises:a controller for controlling vehicle electrical systems (VS), the vehicle electrical systems (VS) comprising one or more high voltage vehicle electrical system (VSHV) connected to the high voltage network (NHV) and one or more low voltage vehicle electrical system (VSLV) connected to the low voltage network (NLV), the vehicle electrical systems (VS) having a predefined order of priority;the controller comprising at least one processor for receiving command signals for the high and low voltage vehicle electrical systems (VSHV, VSLV);a memory device having instructions stored therein and coupled to the at least one processor;wherein the at least one processor is configured to:determine a first electrical load on the high voltage network (NHV) and a second electrical load on the low voltage network (NLV) in dependence on ...

METHOD AND APPARATUS FOR USE IN MEASUREMENT DATA ACQUISITION

Methods for use in a measurement system. Some embodiments comprise at least one sensor unit and a control unit, wherein the at least one sensor unit is configured to detect a physical quantity and to form a sensor data signal. The method comprises, at the control unit, receiving a data receive signal from the sensor unit, and interpreting the data receive signal to be one of at least the sensor data signal and another data signal, wherein the interpreting is based on an attribute information intrinsic to the data receive signal. Furthermore, there is a sensor unit for use in measurement data acquisition, an apparatus configured to control a measurement data acquisition, a measurement system for use in measurement data acquisition, and a medium incorporating a sequence of operation steps that, when executed, perform a method for use in a measurement system for data acquisition. 1. A method for use in a measurement system comprising at least one sensor unit and a control unit , wherein the at least one sensor unit is configured to detect a physical quantity and to form a sensor data signal , the method comprising:at the control unit, receiving a data receive signal from the sensor unit; andinterpreting the data receive signal to be one of at least the sensor data signal and another data signal, wherein the interpreting is based on an attribute information intrinsic to the data receive signal.2. The method for use in a measurement system of claim 1 ,wherein the attribute information is time information.3. The method for use in a measurement system of claim 2 ,wherein the time information is a duration of an interval between a point in time, when a control signal was sent to the sensor unit, and a point in time, when the data receive signal was received.4. The method for use in a measurement system of claim 3 ,wherein the duration is predetermined sufficiently large for the sensor unit to transit from a first state to an operational state that differs from the first ...

ENERGY MONITORING DEVICE

An energy monitoring device includes a power supply circuit electrically coupled to a power source via a hot conductor and a load via a load conductor; a relay circuit including a relay and a relay driver circuit, where the relay includes a plurality of coils and the relay contact electrically coupled to the hot conductor and the load conductor; a sensing circuit including a hot voltage sensor and a load voltage sensor; and a controller electrically coupled to the power supply circuit, the relay driver circuit, and the sensing circuit, and structured to receive a hot voltage from the hot voltage sensor and a load voltage from the load voltage sensor, and determine a load current based at least in part on a relay contact resistance of the relay contact and a delta between the hot voltage and the load voltage. 1. An energy monitoring device comprising:a power supply circuit electrically coupled to a power source via a hot conductor and a load via a load conductor;a relay circuit comprising a relay and a relay driver circuit electrically coupled to the relay and configured to drive the relay, wherein the relay comprises a relay contact and a plurality of coils, and the relay contact is electrically coupled to the hot conductor and the load conductor;a sensing circuit comprising a hot voltage sensor electrically coupled to the power source and a load voltage sensor electrically coupled to the load conductor; anda controller comprising an analog to digital converter, and electrically coupled to the power supply circuit, the relay driver circuit, and the sensing circuit, wherein the controller is structured to receive a hot voltage from the hot voltage sensor and a load voltage from the load voltage sensor, and determine a load current based at least in part on a relay contact resistance of the relay contact and a delta between the hot voltage and the load voltage.2. The energy monitoring device of claim 1 , wherein the controller is structured to determine the delta ...

Sensing Electrical Characteristics via a Relay Coil

A current sense system may include a relay, a load conductor, and an integrator sub-circuit. Current may be provided to an electrical load via the load conductor and a latch of the relay. The current carried via the load conductor may induce a sense voltage in a coil of the relay. Based on the sense voltage induced in the relay coil, the integrator sub-circuit may determine a load sense voltage that indicates a level of the current carried via the load conductor. In some implementations, a current indication module may provide an indicator signal based on the load sense voltage. In addition, the indicator signal may be provided to additional components or devices, such as a relay controller configured to activate the latch. In some implementations, the relay controller may be configured to open the latch based on the current level described by the indicator signal. 1. A current sensing system comprising:a relay having (i) a coil and (ii) a latch that is capable of connecting to a power source via an input of the latch and to an electrical load via an output of the latch, wherein the latch is configured to provide a current to the electrical load from the power source;a load conductor that is connected to the output of the latch and a power input of the electrical load, wherein the current provided by the latch is carried via the load conductor,wherein the load conductor is located in proximity to the coil, such that the current carried via the load conductor induces a sense voltage in the coil; andan integrator sub-circuit that has a first connection to an output of the coil and a second connection to an input of the coil,wherein the coil is configured for an activation state, in which, responsive to an activation signal received by the coil, the latch transitions between an open state and a closed state,wherein the coil is further configured for a sensing state, in which the latch is closed and in which the current is provided to the electrical load via the latch ...

Sensor-based energy management enclosure and distributed energy resource management based on sensor data

A power system of a consumer premises includes a circuit breaker to provide power to an electrical circuit and a current sensor mounted proximate a connection of the circuit breaker. The current sensor generates data that a controller uses to compute current draw for the circuit fed by the circuit breaker. Based on the current draw information, the controller can determine how much real and reactive power is being drawn by individual circuits. The controller can use that information to trigger a power converter to adjust operation to change the quadrant of operation of the current vector.

Method and Device for Current and Voltage Measurement

The present invention relates to a device and a method for measurement of electrical signals in an industrial automation and control system. The device comprises an input circuit, configured to receive an electrical input signal ( 100 ), scale the electrical input signal by a scaling factor and to set the scaling factor according to a scaling signal ( 110 ), an Analog-to-Digital Converter, ADC ( 220 ), which is electrically connected to the input circuit, wherein the ADC is configured to convert the scaled electrical input signal ( 103 ) into an intermediate digital signal ( 120 ), and a first signal path ( 211 ), connected to an digital end of the ADC, configured to create the scaling signal ( 110 ) and to send the scaling signal ( 110 ) to the input circuit, wherein, based on the intermediate digital signal of a sample period and the scaling factor of the sample period, the scaling factor for a subsequent sample period is set.

METHOD AND SYSTEM FOR MONITORING THE OPERATING STATE OF AN ENERGY SUPPLY NETWORK

A method for monitoring an operating state of an energy supply network connects a data processing cloud to selected communication units at a query time over long-range communication connections. Selected communication units transmit measured values and/or values derived therefrom to the data processing cloud over a long-range connection. To receive measured values and/or values derived therefrom, each communication unit is connected, over a short-range communication connection, to at least one sensor on or in a high-voltage device of the network for capturing measured values. The data processing cloud determines the network operating state within an analysis based on measured values and/or values derived therefrom. To provide a simple and cost-effective analysis of the entire network operating state, the data processing cloud during analysis uses measured values and/or values derived therefrom from at least two selected communication units at different locations. 114-. (canceled)15. A method for monitoring an operating state of an energy supply network , the method comprising:connecting a data processing cloud to a number of selected communication units over long-range communication connections at an interrogation time;using each selected communication unit to transmit at least one of measured values or values derived from the measured values to the data processing cloud over one of the long-range communication connections;placing at least one sensor on or in a high-voltage device of the energy supply network to acquire the measured values, and connecting each communication unit over a short-range communication connection to the at least one sensor to obtain at least one of the measured values or the values derived from the measured values;using the data processing cloud to determine the operating state of the energy supply network in an analysis based on at least one of the measured values or the values derived from the measured values; andduring the analysis, ...

VOLTAGE MONITORING SYSTEM UTILIZING A COMMON CHANNEL AND EXCHANGED ENCODED CHANNEL NUMBERS TO CONFIRM VALID VOLTAGE VALUES

A voltage monitoring system having a microcontroller with first and second monitoring applications and a hardware abstraction layer is provided. The hardware abstraction layer sends a second encoded channel number and a first measured voltage value to the first monitoring application. The first monitoring application sends the second encoded channel number to the second monitoring application. The hardware abstraction layer sends a fourth encoded channel number and a second measured voltage value to the second monitoring application. The second monitoring application stores the second measured voltage value in the memory device if the fourth encoded channel number is equal to a first expected encoded channel number, and the second encoded channel number is equal to a second expected encoded channel number. 1. A voltage monitoring system , comprising:a microcontroller having first and second applications, a hardware abstraction layer, and an analog-to-digital converter with a first bank of channels including a first common channel, and as second bank of channels including a first common channel electrically coupled to the first common channel of the first bank of channels;the first application sending a first request message to the hardware abstraction layer that requests a first voltage value from the first common channel of the first bank of channels, the first request message having a first encoded channel number associated with the first common channel of the first bank of channels;the hardware abstraction layer determining a first channel number based on the first encoded channel number, the first channel number being associated with the first common channel of the first bank of channels;the hardware abstraction layer sending a first response message having a second encoded channel number and a first voltage value associated with the first channel number to the first application;the first application sending a first exchanged message having the second encoded ...

VOLTAGE MONITORING SYSTEM UTILIZING FIRST AND SECOND BANKS OF CHANNELS AND EXCHANGED ENCODED CHANNEL NUMBERS FOR TAKING REDUNDANT SAFE ACTION

A voltage monitoring system having a microcontroller with first and second monitoring applications and a hardware abstraction layer is provided. The hardware abstraction layer obtains a first measured voltage value associated with a first channel number. The hardware abstraction layer determines a second encoded channel number based on the first channel number. The hardware abstraction layer sends a first response message having the second encoded channel number and a first measured voltage value therein to the first monitoring application. The first monitoring application commands the microcontroller to generate first and second control signals to transition a contactor to an open operational state, if the second encoded channel number is not equal to a first expected encoded channel number 1. A voltage monitoring system , comprising:a first feedback line being coupled to a high voltage end of a contactor;a second feedback line being coupled to a low voltage end of the contactor;a microcontroller having a first application, a hardware abstraction layer, and an analog-to-digital converter with a first bank of channels; a first channel of the first bank of channels being electrically coupled to the first feedback line;the first application sending a first request message to the hardware abstraction layer that requests a first voltage value from the first channel, the first request message having a first encoded channel number associated with the first channel;the hardware abstraction layer determining a first channel number based on the first encoded channel number, the first channel number being associated with the first channel;the hardware abstraction layer sending a first response message having a second encoded channel number and a first voltage value associated with the first channel number to the first application; andthe first application commanding the microcontroller to generate first and second control signals to transition the contactor to an open ...

Power Control Of A Microgrid

A method for controlling power in a microgrid that includes power sources, loads and at least one connection to a main grid where a transformer is arranged to transfer electric power between the microgrid and the main grid is disclosed. The method includes: monitoring the power balance within the microgrid; monitoring the transformer, including monitoring the transformer temperature; and detecting a need for overloading the transformer based on the power balance within the microgrid. Especially, the method includes: determining a load profile for the transformer based on the power balance within the microgrid; determining a prognosis of the transformer temperature based on the load profile; and determining a schedule for power control of the microgrid, which determining of a schedule for power control includes analyzing the prognosis of the transformer temperature. 1. A method for controlling power in a microgrid , wherein the microgrid comprises power sources , loads and includes at least one connection to a main grid where a transformer is arranged to transfer electric power between the microgrid , and the main grid , said method includes:monitoring the power balance within the microgrid,monitoring the transformer, including monitoring the transformer temperature,detecting a need for overloading the transformer based on the power balance within the microgrid,Whereindetermining a load profile for the transformer based on the power balance within the microgrid,determining a prognosis of the transformer temperature based on the load profile,determining a schedule for power control of the microgrid, wherein the determining of a schedule for power control includes analyzing the prognosis of the transformer temperature.2. The method for controlling power in a microgrid according to claim 1 , further including:performing an optimization of the schedule for power control by repeatedly:determining an updated load profile for the transformer based on the schedule for power ...

Oscillations in electrical power networks

The present invention relates to a method of monitoring oscillations that are liable to interact in an electrical power network, in dependence on measurement of AC waveforms in the electrical power network. The method comprises receiving first waveform data corresponding to an electrical quantity in each phase of at least two phases of three-phase AC waveforms at a location in the electrical power network. The method further comprises applying a transformation to the first waveform data to provide therefrom second waveform data corresponding to an electrical quantity at the location in a single phase representation, the second waveform data depending on the at least two phases.

FACILITY FOR MONITORING A PORTION OF A HIGH-VOLTAGE ELECTRICAL POWER TRANSMISSION NETWORK

A facility for monitoring a portion of a high-voltage electrical power transmission network includes: a plurality of local electrical stations for connecting high-voltage lines, each local electrical station implementing a first communication protocol dedicated to an internal communication between electrical devices; at least one remote monitoring site connected to each of the local electrical stations by a remote control network implementing a second communication protocol dedicated to the remote control. One of the local electrical stations, as a main electrical station, includes an automated mechanism for additional monitoring configured to receive, process, and transmit data conforming to the first communication protocol. The main electrical station is connected to each of the other local electrical stations by an additional monitoring network, distinct from the remote control network, implementing the first communication protocol. 110- (canceled).11. A facility for monitoring a portion of a high-voltage electrical power transmission network , comprising:plural local electrical substations for connection of high voltage lines, located at each of a plurality of nodes of the network portion, each local electrical substation being electrically connected to at least one high voltage line end and implementing a first communication protocol dedicated to internal communication between electrical devices that it contains;at least one remote monitoring site connected to each of the local electrical substations by a remote control network implementing a second communication protocol dedicated to the remote control;wherein:one of the local electrical substations, as a main electrical substation, comprises additional automated monitoring means configured to receive, process, and transmit data conforming with the first communication protocol;the main electrical substation is connected to each of the other local electrical substations by an additional monitoring network, ...

ENERGY MANAGEMENT SYSTEM

An energy management system for enabling an airport including a power storage facility to prepare an electric power purchase plan in order to purchase a predetermined amount of electric power from an electric power company for a predetermined period and to cover electric power to be used at the airport. The energy management system includes an acquisition unit configured to acquire arrival and departure information and information about climate change, a prediction unit configured to predict a fluctuation in the demand for the electric power at the airport based on the arrival and departure information and the information about climate change, and a determination unit configured to determine the predetermined amount of electric power and the predetermined period based on the fluctuation in demand for electric power and a power storage capacity of the power storage facility. 1. An energy management system for enabling an airport including a power storage facility to prepare an electric power purchase plan in order to purchase a predetermined amount of electric power from an electric power company for a predetermined period and to cover electric power to be used at the airport , the energy management system comprising:an acquisition unit configured to acquire arrival and departure information and information about climate change;a prediction unit configured to predict a fluctuation in the demand for the electric power at the airport based on the arrival and departure information and the information about climate change; anda determination unit configured to determine the predetermined amount of electric power and the predetermined period based on the fluctuation in demand for electric power and a power storage capacity of the power storage facility.2. The energy management system according to claim 1 , whereinthe determination unit is configured to determine the predetermined amount of electric power and the predetermined period so that an amount of electric power to ...

Method of Operating An Electrical Grid

Embodiments of a method of operating an electrical grid having at least one electrical consumer and a plurality of electrical producers are disclosed. In the method, a consumption prediction for the electrical consumer is provided, and production predictions for each electrical producer of a plurality of electrical producers are provided. The respective distances between the electrical consumer and each electrical producer of the plurality of electrical producers are determined. An electrical producer of the electrical producers is allocated to the electrical consumer in a first allocating step such that the provided consumption prediction of the electrical consumer matches to the provided production prediction of the at least one electrical producer and such that the determined distance between the electrical consumer and the at least one electrical producer is at least smaller than at least one first distance limit. 1. A method of operating an electrical grid having at least one electrical consumer and a plurality of electrical producers , the method comprising:providing at least one consumption prediction for the electrical consumer,providing respective production predictions for each electrical producer of at least a part of the plurality of electrical producers,determining the respective distances between the electrical consumer and each electrical producer of the part of the plurality of electrical producers,allocating at least one electrical producer of the part of the electrical producers to the electrical consumer in a first allocating step such that the provided consumption prediction of the electrical consumer matches to the provided production prediction of the at least one electrical producer and such that the determined distance between the electrical consumer and the at least one electrical producer is at least smaller than at least one first distance limit,conducting at least one further allocating step if, in the first allocating step, at least the ...

SELF-POWER RELAY AND METHOD FOR PREVENTING MALFUNCTION THEREOF

Disclosed are a self-power relay and a method for preventing a malfunction thereof. The self-power relay comprises: a self-power generation unit for autonomously generating a driving power by performing conversion into a preconfigured driving power level by using, as a source power, a system power of a transmission/distribution line or power system; and a relay operation unit, for measuring the amount of a system power of a transmission/distribution line or power system, blocking a system power transmitted to a load when a failure occurs, and monitoring a change in a source power of the self-power generation unit in real time, so as to stop a relay operation of the self-power generation unit and a relay operation of the relay operation unit itself when abnormality occurs, wherein a malfunction can be prevented by checking an unstable state of a source current and voltage for generation of a self driving power. 1. A self power relay comprising:a self power generator for converting a system power as a source power to a driving power having a preset driving power level to generate the driving power of the relay; and measure a power amount of the system power in real time while operating using the driving power; and', 'in an event of failure of the system power, prevent the system power from being transmitted to a load and stop a relaying operation thereof and an operation of the self power generator while operating using an external rated power., 'a relay unit configured to2. The self power relay of claim 1 , wherein the relay unit is configured to:sample current change in each of three phases system powers used as the source power for the self power generator at a preset period;calculate differences between sampling values of three phases system currents obtained via a predefined number of samplings and monitor change in each of the three phases system currents in real time, based on the calculated differences; andupon determination based on a plurality of predefined ...

Flexible sensor technology

A system and method (referred to as a method) to fabricate sensors and electronic circuits. The method prints a first thin-film having an electronic conductivity of about less than a millionth of a Siemens per meter and a permalloy directly onto the first thin-film. The permalloy has a magnetic permeability greater than a predetermined level and has a thickness within a range of about 1 to 20 microns. The system prints a second thin-film directly onto the permalloy to encapsulate the permalloy onto the first thin-film and prints conductive traces directly onto the surfaces of the first-thin-film, the permalloy, and the second thin-film. In some applications, a sensor is packaged in an additively manufactured three-dimensional cylindrical shape that can be mounted on or is a unitary part of a current carrying conductor without incising, sharing, or severing (e.g., cutting) the current carrying conductor or its insulation.

System to identify potential electrical network faults combining vibration and power quality analysis

A system to identify potential faults in an electrical power distribution system includes a vibration monitor configured to detect a vibration event proximate a portion of the electrical power distribution system, a power quality monitor configured to detect a power quality event in a portion of the electrical power distribution system, an analysis system configured to correlate the vibration event detected by the vibration monitor with the power quality event detected by the power quality monitor, and an output configured to receive information regarding the power quality event from the analysis system and to provide the information to an operator.

Synchronized phasor measurement in power distribution networks

Systems and methods for synchronized phasor measurement in a power distribution network are described. In an aspect, the systems and methods quantify the phase angle between voltages or currents at any two points in the distribution network. In another aspect, the systems and methods establish a common time reference between points on a power distribution network by transmitting a synchronization pulse throughout the distribution network. In an additional aspect, the systems and methods extract phasors from a power line waveform by utilizing a phase-locked loop (PLL) and regression of the zero-crossings of the PLL output waveform.

Condition Monitoring Via Energy Consumption Audit in Electrical Devices and Electrical Waveform Audit in Power Networks

Disclosed are various embodiments for an anomaly detection system for detecting and identifying anomalies in electrical devices based on an energy profile associated with the electrical devices. Energy profile data associated with electrical devices or components in a power network can be obtained using an energy meter. The energy profile data can be analyzed to determine one or more conditions of the electrical devices. An anomaly of the electrical devices can be determined based on the energy profile data and conditions. Further, a root cause of the anomaly can be determined. 1. A system , comprising:an electrical device coupled to a network;an energy meter coupled to with the electrical device, the energy meter device configured to monitor an energy profile of the electrical device; and{'claim-text': ['analyze energy profile data of the electrical device, the energy profile data being received from the energy meter based on the monitoring of the energy profile;', 'monitor one or more conditions of the electrical device based on the energy profile data;', 'detect one or more anomaly in the electrical device based on a change in the one or more conditions; and', 'diagnose one or more root causes of the one or more anomaly based at least in part on one or more characteristics in the energy profile data.'], '#text': 'at least one application executable in a computing device coupled to the energy meter, wherein, when executed, the at least one application causes the computing device to at least:'}2. The system of claim 1 , wherein the energy profile data includes at least one of voltage measurements claim 1 , current measurements claim 1 , or power measurements.3. The system of claim 1 , wherein analyzing the energy profile data comprises comparing the energy profile data with one or more energy profile models.4. The system of claim 3 , wherein claim 3 , when executed claim 3 , the at least one application further causes the at least one computing device to at least ...

DATA COST EFFECTIVE FAST SIMILARITY SEARCH WITH PRIORITY ACCESS

Example implementations described herein are directed to detecting similarity between anomalous events that are currently occurring or have previously occurred transmission power system based on phasor management unit (PMU) data to provide information to grid operators with online decision support. From the high-resolution time synchronized PMU data, the events can be quickly retrieved and compared so that operators can be provided with remedy actions that were attempted in response to the previous events. Utilization of PMU information for such decision support may compliment operation practices relying on supervisory control and data acquisition (SCADA) measurements by allowing a much fast response to the currently occurring event. Accurate identification of similar, historical events can advise grid operators of the cause of disturbances and provide ideas for response. Implementations of the proposed technology may improve the resilience and reliability of the transmission power systems. 1. A system configured to manage one or more phasor measurement units (PMUs) in a power system , the system comprising:a memory configured to store measurement data from the one or more PMUs; receive a plurality of event data sets, which is each related to an event in the power system;', 'identify a plurality of windows of the measurement data;', 'assign each of the plurality of windows of measurement data to one of a plurality of threads;', 'calculate a severity value for each combination of one of the plurality of event data sets, and one of the plurality of threads; and', 'perform a similarity calculation for each combination of the one of the plurality of event data sets, and the one of the threads, which is prioritized by the severity calculated for each combination., 'a processor configured to2. The system of claim 1 , wherein the severity value includes a severity component associated with each of the plurality of event data sets claim 1 , the severity component associated ...

ELECTRIC METER MONITORING DEVICE AND ELECTRIC POWER MONITORING SYSTEM

An electric meter monitoring device and an electric power monitoring system are provided. An image capturing module is disposed at a side opposite to an electric power consumption display module of an electric meter to capture an electric power consumption image of the electric power consumption display module. A clamp meter module clamps on at least one electric wire to detect a value of a current flowing through the at least one electric wire. A temperature humidity meter module detects a temperature value and a humidity value around the electric meter. A control module transmits an electric power consumption value, a current value, the temperature value and the humidity value to a server through a communication module. 1. An electric meter monitoring device for monitoring an electric meter including at least one electric wire and an electric power consumption display module , the electric meter monitoring device comprising:a control module;an image capturing module electrically connected to the control module, wherein the image capturing module is disposed at a side opposite to the electric power consumption display module of the electric meter for capturing an electric power consumption image of the electric power consumption display module, and the electric power consumption image captured by the image capturing module is transmitted to the control module for identification to obtain an electric power consumption value;a clamp meter module electrically connected to the control module, and being clamped on the at least one electric wire for detecting a value of a current flowing through the at least one electric wire;a temperature humidity module electrically connected to the control module for detecting a temperature value and a humidity value around the electric meter;a communication module electrically connected to the control module, wherein the control module transmits the electric power consumption value, the current value, the temperature value and the ...

DIAGNOSTIC SYSTEM FOR A VEHICLE ELECTRICAL SYSTEM

A diagnostic system includes a microcontroller having a first A/D converter, first and second applications, and a first analog multiplexer electrically between a first voltage regulator and the first A/D converter. The first application sets a first overvoltage diagnostic flag to a first fault value if a first voltage of the first voltage regulator that is measured by the first A/D converter is greater than a first voltage, and in response further transitions a contactor to an open operational state. The second application sets a second overvoltage diagnostic flag to a second fault value if a second voltage of the first voltage regulator that is measured by the first A/D converter is greater than a second voltage, and in response further transitions the contactor to the open operational state.

Method and Device for Online Limit Early-Warning to Shunt Capacitor Bank

A method for online limit early-warning to a shunt capacitor bank, and the method comprises: performing harmonic monitoring to the shunt capacitor bank; obtaining a measured voltage and a measured current, based on raw data obtained by the harmonic monitoring; obtaining a first parameter representing a ratio of the measured voltage to a rated voltage and a second parameter representing a ratio of the measured current to a rated current, based on the measured voltage and the measured current; obtaining a relation between an impedance correlation quantity of the shunt capacitor bank and a background harmonic voltage ratio, based on the first parameter, the second parameter, and an obtained series reactance ratio of a detected capacitor circuit; and performing online limit early-warning to the shunt capacitor bank, based on the relation. The present invention also discloses a device for online limit early-warning to a shunt capacitor bank. 1. A method for online limit early-warning to a shunt capacitor bank , wherein the method comprises:performing harmonic monitoring to the shunt capacitor bank;obtaining a measured voltage and a measured current, based on raw data obtained by the harmonic monitoring;obtaining a first parameter representing a ratio of the measured voltage to a rated voltage and a second parameter representing a ratio of the measured current to a rated current, based on the measured voltage and the measured current;obtaining a relation between an impedance correlation quantity of the shunt, capacitor bank and a background harmonic voltage ratio, based on the first parameter, the second parameter, and an obtained series reactance ratio of a detected capacitor circuit; andperforming online limit early-warning to the shunt capacitor bank, based on the relation.5. The method according to claim 4 , wherein the step of performing limit early-warning to the shunt capacitor bank claim 4 , based on the relation between the impedance correlation quantity η and ...

AGENT ANALYSIS SYSTEM, DEVICE AND METHOD

An agent analysis system includes a terminal product system, a remote diagnosis system (RDS), and an agent analyzer. The terminal product system is supplied with a power source and provided with a current sensor to sense the power source. The RDS is used to transmit at least one control instruction via internet for the terminal product system. They agent analyzer is used to communicate with the terminal product system and the RDS, and configured to measure and analyze the electricity use characteristics of the terminal product system to be transmitted to the RDS; and receive and convert the control instruction from the RDS via internet for the terminal product system. 1. An agent analysis system , comprising:a terminal product system supplied with a power source and provided with a current sensor to sense the power source;a remote diagnosis system (RDS) used to transmit at least one control instruction via internet for the terminal product system; andan agent analyzer used to communicate with the terminal product system and the RDS, and configured to:measure and analyze electricity use characteristics of the terminal product system to be transmitted to the RDS; andreceive and convert the control instruction from the RDS via internet for the terminal product system.2. The agent analysis system as claimed in claim 1 , further comprising a mobile device with a mobile application (APP) used to communicate with the terminal product system and the RDS claim 1 , and used to transmit at least one control instruction via internet or wireless direct connection for the terminal product system.3. The agent analysis system as claimed in claim 1 , wherein the power source is an AC power source.4. The agent analysis system as claimed in claim 1 , wherein the agent analyzer is a Wi-Fi box.5. The agent analysis system as claimed in claim 1 , wherein the electricity use characteristics includes a current claim 1 , a voltage claim 1 , a frequency claim 1 , a resistance claim 1 , a ...

Self-Organizing Multiple Appliance Network Connectivity Apparatus For Controlling Plurality Of Appliances

An appliance network connectivity apparatus includes a voltage sensor that generates a signal at an output that is proportional to a voltage provided to the appliance. A current sensor generates a signal at an output that is proportional to a current flowing through the appliance. A processor determines the electrical characteristics of power consumed by the appliance and executes web server software for communicating data through a network. A relay controls power from the power source to the appliance. A memory stores the electrical characteristics. A network interface provides the electrical characteristics to the network. 132-. (canceled)33. An appliance network connectivity apparatus comprising: i. a first voltage sensor electrically coupled to an output of a first power source providing power to a first appliance, the first voltage sensor generating a signal at a first voltage sensor output that is proportional to a voltage provided to the first appliance;', 'ii. a first current sensor electrically coupled to the output of the first power source, the first current sensor generating a signal at a first current sensor output that is proportional to a current flowing through the first appliance;', 'iii. a first processor having a first sensor input electrically coupled to the output of the first voltage sensor and a second sensor input electrically coupled to the output of the first current sensor, wherein the first processor monitors performance of the first appliance by comparing voltage and current waveforms received by the first and second sensor inputs to stored known records of proper functioning appliances, generates first performance data, and executes web server software for communicating the first performance data through a network;', 'iv. a first relay having an electrical input coupled to the first power source, an electrical output coupled to the first appliance, and a first relay control input that is electrically coupled to an output of the first ...

METHOD AND APPARATUS FOR NON-INTRUSIVE PROGRAM TRACING WITH BANDWITH REDUCTION FOR EMBEDDED COMPUTING SYSTEMS

Systems and methods for non-intrusive program tracing of a device are disclosed. The methods involve generating a program trace signal from at least one of power consumption and electromagnetic emission of the device; digitizing and decomposing the program trace signal into at least two digital program trace component signals including a low frequency program trace component and one or more high frequency program trace component signals; classifying fragments of the at least two digital program trace component signals of the program trace signal as at least one of a known portion of program code and an observed behavior of the device. Each of the at least two digital program trace component signals have different frequency bands and the bandwidth of each program trace component signal is smaller than the bandwidth of the program trace signal. Each of the high frequency program trace component signals include an envelope. 1. A system for non-intrusive program tracing of a device comprising:(a) a detector operable to generate a program trace signal from at least one of power consumption and electromagnetic emission of the device, the program trace signal comprising an analog signal having a bandwidth;(b) a decomposer operable to decompose the program trace signal into at least two program trace component signals comprising a low frequency program trace component signal and one or more high frequency program trace component signals, each of the at least two program trace component signals having different frequency bands, the bandwidth of each program trace component signal being smaller than the bandwidth of the program trace signal, each of the one or more high frequency program trace component signals comprising an envelope of the program trace signal within the frequency band of that high frequency program trace component signal;(c) a converter operable to digitize the program trace signal; and(d) a processor operable to classify fragments of at least two digital ...

DETERMINING METER PHASE USING INTERVAL VOLTAGE MEASUREMENTS

A method for determining the phase of an electric meter includes: selecting a population of electric meters; selecting a historical time range based at least in part on the selected population of electric meters; selecting an interval period; creating profiles for each electric meter in the selected population of electric meters based on the voltage measurements over one or more interval periods; calculating a correlation coefficient matrix based on the profiles; clustering the selected population of electric meters into a plurality of clusters; and determining a phase of each cluster of the plurality of clusters. 1. A method for determining the phase of an electric meter , the method comprising:selecting a population of electric meters;selecting a historical time range based at least in part on the selected population of electric meters;selecting an interval period;creating profiles for each electric meter in the selected population of electric meters based on the voltage measurements over one or more interval periods;calculating a correlation coefficient matrix based on the profiles;clustering the selected population of electric meters into a plurality of clusters; anddetermining a phase of each cluster of the plurality of clusters.2. The method of claim 1 , wherein the population of electric meters is selected as a plurality of electric meters connected to a common voltage source.3. The method of claim 2 , wherein the common voltage source is a specified distribution transformer.4. The method of claim 2 , wherein the the common voltage source is a specified feeder circuit.5. The method of claim 1 , wherein the profiles created for each electric meter are voltage profiles.6. The method of claim 1 , wherein the profiles created for each electric meter are voltage change profiles.7. The method of claim 1 , wherein the clustering comprises associating each electric meter with more than one cluster.8. The method of claim 7 , further comprising:calculating confidence ...

Method And System For Measuring Power Loss In A Power Transformer

A system and a method for determining the power loss of a transformer. The method includes measuring voltage and current at the primary side of the transformer, calculating input power by multiplying the measured current and voltage on the primary side of the transformer; measuring voltage and current at the secondary side of the transformer, calculate a nominal error ratio, calculating output power by multiplying the measured current and voltage on the secondary side of the transformer. The method further involves calculating a first corrected power loss by means of multiplying the input power with the nominal error ratio and subtract the output power. 1. A method for determining power loss in a transformer , comprising:measuring voltage and current at a primary side of the transformer;calculating input power by multiplying the measured current and voltage on the primary side of the transformer;measuring voltage and current at a secondary side of the transformer;calculating output power by multiplying the measured current and voltage on the secondary side of the transformer;calculating a nominal error ratio;calculating a first corrected power loss by means of multiplying the input power with a first correction factor which is the complex conjugate of the nominal error ratio and subtract the output power{'sup': '˜', 'claim-text': {'br': None, 'i': n', '/n, 'sup': '˜', 'sub': IL', 'IH, '=(1+ε)/(1+ε)'}, 'wherein the nominal error ratio n/n is{'sub': IL', 'IH, 'where εis a complex number representing the error in the current measurement on the secondary side of the transformer, and εis a complex number representing the error in the current measurement on the primary side of the transformer.'}2. The method according to claim 1 , further including:calculating a voltage error ratio; andwherein the calculation of the corrected power loss further involves multiplying the output power with the voltage error ratio.3. The method according to claim 2 , wherein the voltage error ...

Non-Fault Disturbance-Based Method and System for Measuring Short-Circuit Capacity of Power Grid on Site

Non-fault disturbance-based method and system for measuring short-circuit capacity of a power grid on site including: connecting or disconnecting a reactive compensation device to or from a power grid point of common coupling, to generate a disturbance on a power grid; obtaining total active power and total reactive power of a load of the point of common coupling before the disturbance; determining a vector difference between a voltage of the power grid point of common coupling before the disturbance and a voltage of the power grid point of common coupling after the disturbance; obtaining a voltage effective value of the power grid point of common coupling before the disturbance; obtaining a capacity of the reactive compensation device; and determining a short-circuit capacity of the point of common coupling according to total active power, total reactive power, vector difference between voltages, voltage effective value, and capacity of the reactive compensation device. 1. A non-fault disturbance-based method for measuring a short-circuit capacity of a power grid on site , comprising:connecting or disconnecting a reactive compensation device to or from a power grid point of common coupling, to generate a disturbance on a power grid, wherein the reactive compensation device is a reactive compensation device of the power grid;obtaining a total active power and a total reactive power of a load of the point of common coupling before the disturbance;determining a vector difference between a voltage of the power grid point of common coupling before the disturbance and a voltage of the power grid point of common coupling after the disturbance;obtaining a voltage effective value of the power grid point of common coupling before the disturbance;obtaining a capacity of the reactive compensation device; anddetermining a short-circuit capacity of the point of common coupling according to the total active power, the total reactive power, the vector difference between the ...

MEDIUM VOLTAGE SENSOR USING A MULTI-COMPONENT RESISTIVE VOLTAGE DIVIDER

Improved power line management is provided by the systems and methods disclosed herein that accurately measures voltage in a power distribution system. In various embodiments, the system may include one or more sensor units, each coupled to the power lines using a capacitive or resistive voltage divider to yield a voltage at a sensor unit that is within a measurable range. In one aspect, this voltage may also be used to power the sensor unit and/or other devices coupled to it. 1. A system for measuring electrical properties of a power line comprising a first wire and a second wire , the system comprising: a sensor unit configured for connection to the first wire; and an elongated resistive element comprising a first end configured for connection to the sensor unit and a second end configured for connection to the second wire , the elongated resistive element having a distributed resistance.2. The system of claim 1 , wherein: the sensor unit comprises a voltage sensor configured to measure a voltage difference between the first end of the resistive element and the first wire.3. The system of claim 1 , wherein: the first end comprises a termination comprising a tap connection point and a distal connection point.4. The system of claim 3 , wherein: the elongated resistive element comprises: a rod having an end; a resistive coating on the rod; a first conductive element attached to the rod a first distance from the end; a second conductive element attached to the rod a second distance from the end claim 3 , the second distance being greater than the first distance claim 3 , wherein the tap connection point is formed by the second conductive element.5. The system of claim 4 , wherein: the elongated resistive element further comprises an insulating spacer between the first conductive element and the second conductive element.6. The system of claim 1 , wherein: the second end of the elongated resistive element is configured for connection to the second wire via a clamp.7. ...

Open circuit detection for vehicle power system

A vehicle power system includes an inverter, outlets, and circuit breakers. The inverter supplies power to the outlets through the circuit breakers. The inverter, in response to detecting no voltage at designated amount and combination of the outlets, based on the designated amount and combination, generates a signal indicating that one or more of electrical paths to the outlets has failed or one or more of the circuit breakers is open.

ENERGY MONITORING CURRENT TRANSFORMER ENCLOSURE

An enclosure for an energy monitoring current transformer includes upper housing that houses an upper transformer core section. Lower housing houses a transformer coil and a lower transformer core section. When the enclosure is assembled there is an overlap between the cap for the lower housing and the lower housing that lengthens a creepage path from the upper transformer core to the external surface of the enclosure. 1. An enclosure for an energy monitoring current transformer , the enclosure comprising:upper housing that houses an upper transformer core section;lower housing that houses a transformer coil, wherein when the enclosure is assembled there is an overlap between the upper housing and the lower housing of at least 8 millimeters;a cap for the upper housing, wherein when the enclosure is assembled there is an overlap between the cap for the upper housing and the upper housing of at least 7 millimeters; and,a cap for the lower housing, wherein when the enclosure is assembled there is an overlap between the cap for the lower housing and the lower housing of at least 12 millimeters.2. An enclosure as in wherein the enclosure is made of plastic.3. An enclosure as in wherein the cap for the lower housing includes wire guides that guides lead wires from the transformer coil through the overlap between the cap for the lower housing and out holes in the lower housing.4. An enclosure for an energy monitoring current transformer claim 1 , the enclosure comprising:upper housing that houses an upper transformer core section;lower housing that houses a transformer coil; and,a cap for the lower housing, wherein when the enclosure is assembled there is an overlap between the cap for the lower housing and the lower housing of at least 12 millimeters, the cap for the lower housing includes wire guides that guides lead wires from the transformer coil through the overlap between the cap for the lower housing and out holes in the lower housing.5. An enclosure as in wherein ...

EVALUATION OF VOLTAGE DOMAINS IN THE PRESENCE OF LEAKAGE AND/OR DYNAMIC SWITCHING

An automated circuitry that can co-exist in any chip and that allows for a accurate characterization of I*R drops at a block and/or whole chip level is described. 1. An apparatus of evaluating effective voltage in a circuit comprising:a circuit block coupled to Vdd;an evaluator coupled to a voltage input of the circuit block, to evaluate static and dynamic I*R drop for the circuit block.2. The apparatus of claim 1 , wherein the evaluator comprises a ring oscillator.3. The apparatus of claim 1 , further comprising:a power gate to block off other elements of the circuit when evaluating the circuit block; andthe evaluator to test the effective voltage when the circuit block is idle, and when the circuit block is active.4. The apparatus of claim 1 , further comprising:a controlled oscillator evaluator coupled to the Vdd, the controlled oscillator evaluator matching the evaluator, and designed to provide a reference basis for the evaluator.5. The apparatus of claim 4 , further comprising:the controlled oscillator evaluator comprising two evaluators, a first evaluator coupled through a near zero resistance line and a second evaluator coupled through a calibrated resistance line, to establish a de-rating relationship between an applied voltage and output of the controlled oscillator evaluator.6. The apparatus of claim 1 , wherein the evaluator is a ring oscillator and the output of the ring oscillator is an oscillation speed claim 1 , based on the effective voltage.7. The apparatus of claim 1 , further comprising:a P/N transistor assessor to establish a statistically balanced measure of upper and lower leakage bounds for each of the P-devices and N-devices in the circuit.8. The apparatus of claim 7 , wherein the P/N transistor assessor tests with a P-transistor and an N-transistor in an On/On claim 7 , On/Off claim 7 , and Off/On configuration.9. The apparatus of claim 1 , further comprising:an output system to multiplex outputs of a plurality of evaluators, evaluating a ...

Voltage Stability Monitoring Device and Method

An object is to accurately monitor deterioration of current or future voltage stability, by dynamically changing a bus in which current or future voltage stability deteriorates, in stability monitoring calculation of a power system. Hence the present invention provides a voltage stability monitoring device, which monitors voltage stability of a power system, including an assumed change scenario calculation unit which produces a plurality of assumed change scenarios indicating a scenario of a change that is assumed based on at least one of a system configuration of the power system and a change of a tide state; a voltage stability calculation unit which calculates the voltage stability using the assumed change scenario; a voltage stability margin calculation unit which calculates a voltage stability margin indicating margin degree of the voltage stability, based on the voltage stability; an each scenario severity ranking calculation unit which selects an assumed change scenario with high severity of the voltage stability for each assumed change scenario, based on the voltage stability margin; a vulnerable bus calculation unit which calculates which of buses in the power system is a vulnerable bus that decreases voltage stability, based on the assumed change scenario which is selected; and a monitoring location change unit which changes a monitoring target of the voltage stability, based on information of the vulnerable bus.

AN ELECTRIC METER, AN ELECTRIC METER SYSTEM AND A METHOD OF PROVIDING BRANCH-LEVEL READINGS FOR A POWER DISTRIBUTION NETWORK

According to various embodiments, there is provided an electric meter including a sensor circuit configured to provide a plurality of instantaneous magnetic field measurements; a processing circuit configured to generate a time-series of magnetic field vectors, each magnetic field vector of the time-series of magnetic field vectors including the plurality of instantaneous magnetic field measurements; and a total current determination circuit configured to determine a total current, wherein the total current is a sum of currents of each branch of a plurality of branches of a power distribution network; wherein the processing circuit is further configured to compute a de-mixing matrix based on the determined total current and the time-series of magnetic field vectors, and further configured to linear transform each magnetic field vector using the de-mixing matrix to determine a current of each branch. 1. An electric meter comprising:a sensor circuit configured to provide a plurality of instantaneous magnetic field measurements;a processing circuit configured to generate a time-series of magnetic field vectors, each magnetic field vector of the time-series of magnetic field vectors comprising the plurality of instantaneous magnetic field measurements; anda total current determination circuit configured to determine a total current, wherein the total current is a sum of currents of each branch of a plurality of branches of a power distribution network;wherein the processing circuit is further configured to compute a de-mixing matrix based on the determined total current and the time-series of magnetic field vectors, and further configured to linear transform each magnetic field vector using the de-mixing matrix to determine a current of each branch.2. The electric meter of claim 1 , wherein each instantaneous magnetic field measurement of the plurality of instantaneous magnetic field measurements is a measurement of a sum of magnetic fields resulting from a subset of ...

Hot stick power analyzer

A hot stick power analyzer includes a housing mounted on a pole and a channel for a power line. A ground line extends from the housing and there is a power line conductive contact. A voltage sensor includes voltage sensing circuitry connected to the power line conductive contact and the ground line. There is a high voltage capacitance between the ground line and the voltage sensing circuitry. A current sensor includes windings about and spaced from the power line. A processing subsystem is responsive to the voltage sensing circuitry and to the current sensor and is configured to compute power analysis metrics.

SYSTEMS AND METHODS FOR SWING ANGLE ESTIMATION IN AN ELECTRICAL POWER SYSTEM

In accordance with one embodiment, a method for detection of power swing for at least a first range of swing angles between an internal voltage (E) of a source-end generator and an internal voltage (E) of a receiving-end generator is provided. The method includes obtaining a voltage magnitude (V) of the source-end generator, and a current magnitude (I) of the source-end generator. The method further includes estimating a total reactance (X) between the source-end generator and the receiving-end generator, and estimating a first swing angle (θ) between the Eand the Eas a function of the obtained V, the obtained Iand the estimated X. The method further includes detecting a power swing condition based on the estimated θ. 1. A method , comprising:{'sub': S', 'R, 'for at least a first range of swing angles between an internal voltage (E) of a source-end generator and an internal voltage (E) of a receiving-end generator{'sub': 'S', '(i) obtaining a voltage magnitude (V) of the source-end generator;'}{'sub': 'S', '(ii) obtaining a current magnitude (I) of the source-end generator;'}(iii) estimating a total reactance (X) between the source-end generator and the receiving-end generator;{'sub': S', 'R', 'S', 'S, '(iv) estimating a first swing angle (θ) between the Eand the Eas a function of the obtained V, the obtained Iand the estimated X; and'}(v) detecting a power swing condition based on the estimated θ.2. The method of claim 1 , wherein the step (iii) comprises estimating the X as a function of a maximum magnitude of current (I) determined during the power swing condition and a maximum magnitude of real power (P) determined during the power swing condition.3. The method of claim 1 , further comprising obtaining a load angle (α) between the Vand the I.4. The method of claim 3 , wherein the step (iv) comprises estimating the θ as a function of the obtained α.5. The method of claim 1 , further comprising:{'sub': S', 'S, 'determining a real power value (P) based on the ...

Method for estimating voltage stability

A method for estimating voltage stability, includes establishing a multi-port equivalent model and the measurement-based equivalent impedance; calculating the reactive power response factor through two consecutive samples from wide-area phasor measurement unit measurement; finding the mitigation factor; constructing the modified coupled single-port model with the modified impedance and voltage; and using the modified maximal loading parameter for voltage stability assessment.

Fault Waveform Recording Device

In a fault waveform recording device, a first storage stores data detected in a power system, the data being up-to-date and indicating an electrical quantity during a first period, and halts the updating of the data stored in the first storage after a second period has elapsed since an abnormality detection time at which an abnormality in the power system is detected. The second period is shorter than the first period. First operation unit stores data in a first interval as is into a second storage, among the data of the first period stored in the first storage after the updating of the data stored in the first storage is halted, the first interval including the abnormality detection time, and decimates data in a second interval different from the first interval. 1. A fault waveform recording device , comprising: a first storage; a second storage; and a first operation unit , store data detected in a power system at a constant sampling frequency when the power system is normal, while successively updating the data, the data being up-to-date and indicating an electrical quantity during a first period; and', 'halt the updating of the data stored in the first storage after a second period has elapsed since an initial abnormality detection time at which an initial abnormality of the electrical quantity, among a plurality of abnormalities, in the power system is detected, the plurality of abnormalities resulting from an event of a fault and an event of switching of a circuit breaker associated with the fault, the plurality of abnormalities each including a variation in amplitude and/or phase of the electrical quantity beyond a threshold, the second period being shorter than the first period,, 'the first storage being configured to set flags in the event of the fault and in the event of the switching of the circuit breaker;', 'divide, based on the flags, the data of the first period stored in the first storage after the updating of the data is halted, into abnormality- ...

DEVICE FOR MEASURING AN ELECTRICAL QUANTITY OF ONE PHASE OF AN AC ELECTRIC CURRENT OF AN OVERHEAD ELECTRICAL NETWORK

The invention relates to a device for measuring an electrical quantity of one phase of an AC electric current in an overhead electrical network, comprising: a sensor designed to be attached to an electric line of the overhead electrical network, said sensor including: an electrically conductive plate; an electrical conductor, designed to electrically connect the plate to the electric line, in order to circulate a first electric current from the electric line through the electrical conductor; a processing unit, designed to determine the electrical quantity from a value of the first electric current and a value of a capacitance between the plate and the ground. Said device also comprises a generator, electrically connected to the electrical conductor and designed to inject a second electric current through the electrical conductor, said second electric current having a frequency other than the frequency of the first electric current, the processing unit also being designed to calculate the value of the capacitance between the plate and the ground as a function of a value of the second electric current. 2. The device according to claim 1 , wherein it further includes:a second electrically conductive plate,a second electrical conductor, configured to electrically connect the second plate to the electric line for the circulation of at least part of the first electric current from the electric line to the second plate through the second electrical conductor, the second electrical conductor being electrically connected to the output of the generator for the circulation of at least part of the second current injected through the second conductor.3. The device according to claim 1 , wherein the device further includes a first measuring apparatus configured to measure the first electric current and the second electric current circulating through the electrical conductor.4. The device according to claim 3 , wherein the first electrical conductor has a first resistance claim 3 ...

System and Method of Power Grid Monitoring

The application discloses a method and apparatus for determining an operational status of one or more power grid components () of a power grid (). The grid components () have component signatures representative of the operational status of the power grid component (). The method comprises obtaining using a monitor () at least one of a current waveform or a voltage waveform at a location, analyzing the obtained one of the current waveform or the voltage waveform, establishing one or more waveform data values of the waveform, accessing a database having a plurality of component signatures, and by comparison of the waveform data values with the component signatures producing one or more results representative of the operational status. 1. A method for determining an operational status of one or more power grid components of a power grid , the one or more power grid components have component signatures representative of the operational status of the power grid component , the method comprising:obtaining using a monitor at least one of a current waveform or a voltage waveform at a location;analyzing the obtained one of the current waveform or the voltage waveform;establishing one or more waveform data values of the waveform;accessing a database having a plurality of component signatures; andby comparison of the waveform data values with the component signatures producing one or more results representative of the operational status.2. The method of claim 1 , wherein the analyzing of the one of the current waveform or the voltage waveform comprises performing at least one of a spectral analysis claim 1 , a Fourier transform to produce the waveform data values.3. The method of claim 1 , wherein the obtaining of the current waveform or the voltage waveform comprises digitally sampling the waveform.4. A system for determining an operational status of one or more power grid components in a power grid comprising:a monitor for obtaining at a location at least one of a current ...

SYSTEM AND METHOD FOR STABILITY MONITORING, ANALYSIS AND CONTROL OF ELECTRIC POWER SYSTEMS

A system and method for stability monitoring, analysis, and control of energy systems, such as electric power systems, is provided. Specifically, the system and method described herein use a Koopman mode analysis to represent the operation of individual components in an energy system and/or to determine and rank a level of stability of the individual components in the energy system. The system and method described herein also use a Koopman mode analysis to determine optimal and/or safe times to release energy stored in storage systems. 1. A system for stability monitoring , analysis , and control in an energy system , the system comprising:a computer data repository configured to store physical data measured by at least one physical sensor; and retrieve the physical data from the computer data repository, wherein the physical data corresponds to a first power entity, and wherein the physical data comprises data of a first type;', 'determine a plurality of growth rate values and a plurality of frequency values associated with the first power entity using the retrieved physical data and a spectral analysis technique, wherein each growth rate value in the plurality of growth rate values is associated with a frequency in a range of frequencies, and wherein each frequency value in the plurality of frequency values is associated with a frequency in the range of frequencies;', 'determine a level of stability of the first power entity based on at least one growth rate value in the plurality of growth rate values; and', 'generate user interface data for rendering a user interface on a computing device, wherein the user interface data comprises a representation of the first power entity and an indication of the determined level of stability of the first power entity., 'an stability analyzer configured to, 'a computing system comprising one or more computing devices, the computing system in communication with the computer data repository and programmed to implement2. The ...

INCORPORATING A WIRELESS CURRENT SENSOR INTO EXISTING ELECTRICAL POWER SYSTEMS

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 ...

Supplemental techniques for characterizing power quality events in an electrical system

A method for characterizing power quality events in an electrical system includes deriving electrical measurement data for at least one first virtual meter in an electrical system from (a) electrical measurement data from or derived from energy-related signals captured by at least one first IED in the electrical system, and (b) electrical measurement data from or derived from energy-related signals captured by at least one second IED in the electrical system. In embodiments, the at least one first IED is installed at a first metering point in the electrical system, the at least one second IED is installed at a second metering point in the electrical system, and the at least one first virtual meter is derived or located at a third metering point in the electrical system. The derived electrical measurement data may be used to generate or update a dynamic tolerance curve associated with the third metering point.

Combined In-Line DC and AC Current Sensor for High Voltage Electric Power Lines

The present invention may be embodied in an in-line high voltage electric power line monitor including a DC current sensor, an AC current sensor, an energy harvesting power supply, and a communication device. The in-line power line monitor includes a bus bar that connects in series with the monitored power line. For example, the in-line power line monitor may be connected at the junction point between the monitored power line and a support structure, such a sectionalizing switch that supports the monitor positioned between the switch and the power line. A pair of DC current measurement pickups are spaced apart on the bus bar and operatively connected to the microprocessor. The in-line power line monitor also includes an AC current sensor coil and an energy harvesting device (e.g., inductive coil) that surround the bus bar. The AC current sensor coil and the power supply coil are positioned adjacent to, but spaced apart from, the bus bar. An electronics board pair carries a pair of foil patch antenna elements positioned adjacent to the outer perimeter of the electronics board. Although the in-line power line monitor does not require a separate power supply, the electronics board may carry a backup battery if desired. 1. An in-line combined DC and AC current sensor for an electric power line , comprising:a bus bar configured to be connected in-line with an electric power line conductor;an electronics board positioned transverse to the bus bar with the bus bar extending through the electronics board, electronic components carried the electronics board comprising a microprocessor, a memory and a radio, operatively connected to the microprocessor;a pair of DC current measurement pickups spaced apart on the bus bar and operatively connected to the microprocessor;a power supply coil operatively connected to the microprocessor and positioned transverse to the bus bar with the bus bar extending through the power supply coil, the power supply coil configured to harvest ...

Bi-Directional Electric Energy Meter

An electric energy meter for a poly-phase electricity network includes a power transformer having a primary side and a secondary side, a first analog front end (AFE) unit is coupled to the secondary side of the power transformer, and a microcontroller coupled to the primary side of the power transformer. The first AFE unit is to be coupled to a first phase of the poly-phase electricity network. The microcontroller is configured to transmit a digitized request signal to, and to receive a measurement signal from, the first AFE unit via the power transformer. More specifically, the first AFE unit, upon receiving the digitized request signal, is to extract information from the digitized request signal. 1. A method , comprising:transmitting, by a microcontroller coupled to a primary side of a power transformer, a digitized request signal to a plurality of analog front end (AFE) units, wherein each AFE unit is coupled between a secondary side of the power transformer and a first phase of a poly-phase electricity network;receiving, from a first AFE unit, a first phase of current of the poly-phase electricity network; andreceiving, from a second AFE unit, a first phase of voltage of the poly-phase electricity network.2. The method of claim 1 , wherein the first phase of current is digitized.3. The method of claim 1 , wherein the first phase of voltage is digitized.4. The method of claim 1 , wherein the digitized request signal comprises clock information.5. An apparatus claim 1 , comprising:a power transformer having a primary side and a secondary side;a first analog front end (AFE) unit coupled to the secondary side of the power transformer, the first AFE unit is to be coupled to a first phase of a poly-phase electrical distribution and configured to measure current for the first phase;a second AFE unit coupled to the secondary side of the power transformer, and the second AFE unit is to be coupled to the first phase of the poly-phase electricity network and configured to ...