Method for comparing waveform features of power system faults

The invention relates to a method for comparing waveform features of a power system faults. The method includes: determining a storage format of a power system fault information database; extracting common fault feature information from all fault recording file packages in the power system fault information database, and storing the results in corresponding positions in the storage format of the power system fault information database; pre-processing all the fault recording file packages in the power system fault information database; comparing a waveform feature of one of the fault recording file packages with that of the other fault recording file packages in the power system fault information database; judging the fault recording file packages with the similar waveforms. The method is an unprecedented means for listing sampling passages with similar waveform features according to quantitative level of similarity, can help technicians to reveal general problems difficult to discover, ...

Method for performing calibration time delay error testing on time delay calibration switch of intelligent substation

The invention discloses a method for performing calibration time delay error testing on a time delay calibration switch of an intelligent substation. The method comprises the following steps: performing special processing on a transmitting port SV (Sampling Value) message; after the time delay calibration switch receives the SV message, calculating a time delay value from the entrance of the message into a receiving port to the transmission of the message from another port, and filling the time delay value into a reserved field of the SV message; receiving and filtering a specific SV message by the receiving port, and locking a first bit time scale of a received first frame message; calculating a measured time delay value; solving the received SV message, and extracting a switch time delay value calibrated in the reserved field of the SV message; and calculating the difference between the measured time delay value and the calibrated time delay value. The calibrated SV time delay error of ...

3G wireless communication-based secondary equipment state monitoring system

The invention relates to a 3G wireless communication-based secondary equipment state monitoring system. The technical characteristics are that the system includes a monitoring module, a background module and a public network domain name server, wherein the monitoring module is provided with a 3G communication sending module, and the background module is provided with a 3G communication receiving module and a human-computer interface; and the 3G communication sending module, the 3G communication receiving module and the public network domain name server are in mutual communication connection, the monitoring module sends monitored state data to the 3G communication sending module, the 3G communication sending module asks the public network domain name server for obtaining a dynamic IP address of the background module and sends the state data to the 3G communication receiving module, and the 3G communication receiving module sends the received state data to the background module to be stored ...

Distributed automatic power supply on and off control system for fault recorder

Provided is a distributed automatic power supply on and off control system for a fault recorder. The system comprises an information far transmission host installed in an information far transmission screen, a power supply on and off controller installed in the fault recorder, an intermediate relay and a fault recorder microcomputer processor. The information far transmission host is connected with the power supply on and off controller through a serial port, the power supply on and off controller is connected with the intermediate relay through a power control line, and the information far transmission host is connected with the fault recorder microcomputer processor through an Ethernet switch. According to the distributed automatic power supply on and off control system for the fault recorder, whether the fault recorder microcomputer processor crashes or not is judged through communication of the fault recorder and an information far transmission substation system, and then the power ...

Power grid fault positioning method and device, medium and equipment

The invention discloses a power grid fault positioning method and device, a medium and equipment. The method comprises the steps that after a power grid breaks down, preset fault characteristic quantities of power grid fault candidate equipment are extracted, and the preset fault characteristic quantities comprise eight power grid fault characteristic quantities of an A phase, a B phase, a C phase, an AB phase, a BC phase and an AC phase of each power grid fault candidate equipment; and inputting the preset fault characteristic quantity into the trained fault positioning model, and outputting a fault positioning result of the power grid.

Mechanism for steel cylinder overturning stand

Composite type island detection method based on phase deviation and frequency variation

The invention discloses a composite type island detection method based on phase deviation and frequency variation. Firstly, delta theta1 and delta theta2, the motion values of two phase deviations areset, and the condition that delta theta1 is more than delta theta2 is met; when the phase deviation angle of the end voltage of a distributed generator (DG, Distributed Generator), delta theta is more than delta theta1, DG is directly judged as island operation; when delta theta is more than delta theta2 and less than delta theta1, the frequency variation value delta f is introduced as supplementary detection amount, only when the condition that delta theta is more than delta theta2 and delta f is less than delta f1 is met, delta f1 is frequency variation motion value, so that the motion of the detection device is judged as island state; the composite type motion criteria of the island detection are concluded as follows: delta theta is more than delta theta1(1) or delta theta is more thandelta ...

Special network switch for intelligent substation and data switching method of network switch

The invention relates to a special network switch for an intelligent substation and a data switching method of the network switch. The network switch is characterized in that the network switch includes a plurality of service FPGAs and a central processor; the service FPGAs are connected with one another sequentially so as to form data transmission loops; the service FPGAs are used for the input, transmission, identification, processing and output of messages generated by secondary equipment in the intelligent substation; any one service FPGA is used for performing clock synchronization on the other service FPGAs; and the central processor is used for configuring start address and destination address-contained identification information for messages entering the data transmission loops, and allocating MAC addresses and/or IP addresses with uniqueness for the service FPGAs so as to facilitate identification and processing on corresponding messages according to the identification information ...

Traveling wave failure distance measurement method for electric power circuit

The invention provides a traveling wave failure distance measurement method for an electric power circuit, which comprises the following steps of: (1) measuring initially, namely measuring time difference delta T that an initial traveling wave surge caused by a failure reaches both ends M and N of the circuit when the circuit fails internally, and solving the distance from a bus at the M end to a failure point F, wherein L is the length of the circuit, v is the propagation velocity of a traveling wave, the delta T is equal to the difference of TM and TN and the distance is used as a reference value; and (2) verifying and correcting, namely measuring time difference delta t between a first forward traveling wave surge of the bus at the M end and a reflection traveling wave surge of the failure point after the failure occurs, and solving the distance from the bus to the failure point F, wherein if delta D which is equal to the absolute value of (DMF-DMF*) is less than or equal to 1 kilometer ...

Traveling system of off-road tire-track integrated crane

The invention discloses a travelling system of an off-road tire-crawler integrated crane, which comprises a center console, a power device and a safety monitoring device, and is characterized in that the center console is arranged in a carriage and is used for switching the travelling modes of crawler wheels or tires of the crane; the walking mode of the to-be-switched crawler wheel or tire forms an instruction and is sent to the power device; and the power device starts or closes the crawler wheel driving module and the tire driving module based on an instruction issued by the center console. According to the travelling system disclosed by the invention, the crawler wheels can be added on the premise of not changing the travelling function of tires of the crane, the travelling modes of the crane are increased, the travelling modes of the crane can be changed according to actual road conditions, the travelling system is suitable for travelling under different road conditions, and the crane ...

Method for carrying out secondary equipment whole life cycle management by electronic label

The invention provides a method for carrying out secondary equipment whole life cycle management by an electronic label. The method comprises the following stages of: building an electronic label recognition system; building relay protection factory information; building a relay protection standing book; importing the relay protection standing book; initializing electronic label codes; pasting labels; carrying out operation maintenance information maintenance an in operation maintenance management unit; carrying out patrol and examination management; and sharing information among systems, and the like. The method for carrying out the secondary equipment whole life cycle management by the electronic label provided by the invention has the advantages that the unified management of the standing book-card-object standing book and operation and transformation information of relay protection equipment is realized through building a relay protection equipment management system on the basis of ...

Automatic detecting and early warning method for relay protection device and fault recorder

Disclosed is an automatic detecting and early warning method for a relay protection device and a fault recorder. The method comprises the steps of acquiring data, calculating effective values, unifying the calculated effective values to the primary side, ranking the effective values, calculating the average value, determining a failure and the like. The method has the advantages that failures of the relay protection device and the fault recorder in an electric system can be found in time, the defect of the prior art that potential safety hazards can be caused by failure checking lag during periodical check can be overcome, and then the frequency of grid failures caused by failures of a device itself can be reduced greatly.

Power grid line fault positioning method and system

The invention discloses a power grid line fault positioning method and system, and the method comprises the steps: obtaining a wave recording file of a power grid transformer substation, and the wave recording file comprises a voltage value; calculating a zero-sequence voltage before the neutral point of the transformer substation is broken down according to the recording file; identifying the number of the transformer substations according to the maximum and equal voltage in the zero sequence voltage before the neutral point of the transformer substation is broken down; and determining the specific position of the fault point according to the number of the identified transformer substations in combination with the fault distance. According to the method, the calculation result of the zero-sequence voltage under the fault condition is adopted, correct fault points are positioned in a plurality of possible fault positions, the workload of operation and maintenance personnel is reduced, and ...

Composite type island detection method based on phase deviation and frequency variation

The present invention discloses a composite type island detection method based on phase deviation and frequency variation. Firstly, delta theta1 and delta theta2, the motion values of two phase deviations are set, and the condition that delta theta1 is more than delta theta2 is met; when the phase deviation angle of the end voltage of a distributed generator (DG, Distributed Generator), delta theta is more than delta theta1, DG is directly judged as island operation; when delta theta is more than delta theta2 and less than delta theta1, the frequency variation value delta f is introduced as supplementary detection amount, only when the condition that delta theta is more than delta theta2 and delta f is less than delta f1 is met, delta f1 is frequency variation motion value, so that the motion of the detection device is judged as island state; the composite type motion criteria of the island detection are concluded as follows: delta theta is more than delta theta1(1) or delta theta is more ...

Concentrated automatic power supply switch on and off control system for fault recorder

A concentrated automatic power supply switch on and off control system for a fault recorder comprises an information remote transmission system mainframe, a power supply switch on and off concentrated controller, a intermediate relay and a fault recorder microcomputer processor, wherein the information remote transmission system mainframe and a power supply switch on and off concentrated controller are mounted inside a information remote transmission screen, the intermediate relay and the fault recorder microcomputer processor are mounted in a fault recorder screen, the information remote transmission system mainframe is connected with the power supply switch on and off concentrated controller through a serial port, the power supply switch on and off concentrated controller is connected with the intermediate relay through a power supply control line, the information remote transmission system mainframe is connected with the fault recorder microcomputer processor through an Ethernet switch ...

Method for checking relay protection pressing plate by using information remote transmission system

Disclosed is a method for checking a relay protection pressing plate by using an information remote transmission system. The method comprises the steps that a remote transmission master station manager logs into a server in an information remote transmission master station system to input current relay protection pressing plate states into a master station relay protection pressing plate state database in advance; a dispatching center issues pressing plate position switching operation instructions of relay protection devices to a protection team, protection personnel go to the site for operation, and the remote transmission master station manager is notified; a master station collects the current pressing plate state of the corresponding relay protection device through the information remote transmission system; the master station information remote transmission system compares the collected current pressing plate state with data in the database, and if an inconsistent situation is found ...

Non-fault area power supply recovery method and system considering distributed power supply access

The invention discloses a non-fault area power supply recovery method and system considering distributed power supply access. The method comprises the following steps: acquiring a pre-constructed active power distribution network load transfer multi-objective optimization model considering distributed power supplies; determining constraint conditions of the multi-objective optimization model; according to the constraint conditions, solving the multi-objective optimization model to obtain an active power distribution network load transfer optimization scheme; and performing non-fault area power supply recovery according to the active power distribution network load transfer optimization scheme. The method has the advantages that by constructing the active power distribution network load transfer multi-objective optimization model, the problems that existing active power distribution network load transfer mainly focuses on network loss and transfer switch operation time sequence, and the ...