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Power distribution network relay protection vector check and action logic verification test device and method

A relay protection and action logic technology, applied in emergency protection circuit devices, electrical components, fault locations, etc., can solve the problems of small transformer capacity, short distribution network line distance, and inability to meet relay protection vector inspection, etc. The effect of eliminating hidden dangers, improving accuracy and good adaptability

Pending Publication Date: 2022-01-14
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some difficulties in popularizing and applying to distribution network. The line distance of distribution network is short, the transformer capacity is small, and the output voltage and output current of the test system cannot achieve continuous and stable control, which cannot meet the needs of relay protection vector inspection.
[0005] As for the action logic verification of the self-healing device and protection device in the relay protection work, since the devices are distributed and arranged between switch stations with a long distance, the action logic involves the information synchronization and interaction of each side, and the field test work has always been a Problems that trouble the relay protection action verification
The existing technology often uses the method of simulating the signals of each side on the spot and virtualizing the fault environment of the power system. However, this test method lacks systematic debugging of the device, and the verification is performed by simulating the fault of the secondary current, which cannot truly restore the protection after the fault of the power grid. The action behavior of the device and the self-healing device affects the accuracy of the test results

Method used

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  • Power distribution network relay protection vector check and action logic verification test device and method
  • Power distribution network relay protection vector check and action logic verification test device and method
  • Power distribution network relay protection vector check and action logic verification test device and method

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Effect test

Embodiment 1

[0063] A relay protection vector check and action logic check method before the distribution network is put into operation, including the method steps when performing a bus crossing short circuit test, to check bus differential protection, incoming and outgoing line current differential protection, and backup with direction Protection vector. Method steps when carrying out a transmission line crossing short circuit test for checking busbar protection, current differential protection on both sides and vectors with directional back-up protection. In the method step when carrying out the distribution transformer through-circuit short-circuit test, the vectors of the bus differential protection and the distribution transformer protection can be checked. The method steps when performing the simulated line fault test are used to check the logic of fault protection in the zone, the correct action of self-healing, and the logic of non-maloperation of the fault protection outside the z...

Embodiment 2

[0072] a. When the equipment to be tested is the busbar in the station, connect the inductive analog load, adjust the analog load to 1Ω, adjust the output current and output voltage of the converter equipment, and perform busbar protection, line current differential protection, and line direction overcurrent protection. Vector inspection, as well as the vector inspection of secondary equipment such as related measuring instruments, metering meters, wave recording, control systems, etc., it is necessary to pay attention to the fact that the voltage and current are basically orthogonal in phase, and the phase angle of the voltage is 90° ahead of the current. Judge the correctness of the vector of secondary equipment such as relay protection according to the conventional vector judgment standard.

[0073] When the primary rated current of the current transformer is greater than 1000A, adjust the output current and voltage of the converter equipment to be greater than 20A and 20V (...

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Abstract

The invention is suitable for the technical field of power system detection, and provides a power distribution network relay protection vector check and an action logic verification test device and a method. The power distribution network relay protection vector check and action logic verification test device is characterized by comprising a converter device and a simulation load, the input end of the converter device is connected with a mains supply, the output end of the converter device is connected with the input end of a device to be tested, and the simulation load is connected with the output end of the device to be tested; the converter device is used for adjusting output voltage and output current output to the device to be tested, the simulation load comprises a test inductor, an inductive simulation load, a capacitive simulation load and a simulation grounding wire which are connected in parallel, and the simulation load and the device to be tested can form various loops; when the device to be tested is tested, at least one of the following functions is realized by adjusting the simulation load: estimating the impedance of the device to be tested; performing impedance compensation on the device to be tested; and performing fault simulation on the device to be tested.

Description

technical field [0001] The invention relates to the technical field of power system detection, in particular to a distribution network relay protection vector inspection and action logic verification testing device and method. Background technique [0002] Vector inspection and action logic verification are important items in the relay protection work. The vector and logic errors of the distribution network will cause the relay protection to malfunction or refuse to operate in the normal operation state and the fault state. The relevant regulations clearly stipulate that for new installations For equipment or devices with large changes in the circuit, the working current and working voltage of the primary system must be inspected and judged before being put into operation. unsuccessful case. Therefore, in order to ensure the safe operation of secondary equipment in the distribution network, it is necessary to fully verify the correctness of vector and secondary device actio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08H02H7/26
CPCG01R31/086H02H7/26
Inventor 张卫明李铁成王献志张兵海刘清泉李泽
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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