Identification method and system for lightning fault intrusion wave and ground fault intrusion wave

A technology of lightning strike fault and ground fault, applied in the field of power grid, can solve the problems of low identification efficiency and inaccuracy, and achieve the effect of accurate identification

Active Publication Date: 2017-03-22
GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a high-efficiency and accurate identification method for lightning fault intrusion waves and ground fault intrusion waves in view of the problems of low identification efficiency and inaccuracy in the identification methods of general lightning fault intrusion waves and ground fault intrusion waves with the system

Method used

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  • Identification method and system for lightning fault intrusion wave and ground fault intrusion wave
  • Identification method and system for lightning fault intrusion wave and ground fault intrusion wave
  • Identification method and system for lightning fault intrusion wave and ground fault intrusion wave

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specific Embodiment 1

[0068] image 3 Shown is a complete waveform diagram of a substation fault intrusion wave, from which the main wave waveform diagram of the substation fault intrusion wave is extracted as Figure 4 As shown, the above-mentioned energy distribution analysis based on FFT analysis for the main wave of the substation fault intrusion wave is obtained as follows Figure 5 The energy distribution diagram of the main wave main wave of the lightning fault intrusion shown above adopts the results based on the above FFT analysis: the energy ratio of the main wave of the intrusion wave from 0 to 50 kHz is 75.4%, and the result is less than 85%, that is, the intrusion wave of the substation fault is a lightning fault intrusion Wave.

specific Embodiment 2

[0070] Figure 6 Shown is the complete waveform diagram of another substation fault intrusion wave, from which the main wave waveform diagram of the substation fault intrusion wave is extracted as Figure 7 As shown, the above-mentioned energy distribution analysis based on FFT analysis for the main wave of the substation fault intrusion wave is obtained as follows Figure 8 The energy distribution diagram of the main wave main wave of the lightning fault intrusion shown above adopts the results based on the FFT analysis above: the energy proportion of the main wave of the intrusion wave from 0 to 50 kHz is 99.8%, and the result is greater than 95%, that is, the substation fault intrusion wave is a ground fault intrusion Wave.

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Abstract

The invention provides a method and a system for identifying lightning fault invasion waves and grounding fault invasion waves. The method comprises steps that transformer station fault invasion waves are acquired, a main wave energy distribution scope of the transformer station fault invasion waves is analyzed, a lightning fault invasion wave main wave energy distribution scope and a grounding fault invasion wave main wave energy distribution scope are acquired, and the transformer station fault invasion waves are identified to be the lightning fault invasion waves or the grounding fault invasion waves according to the main wave energy distribution scope of the transformer station fault invasion waves, the lightning fault invasion wave main wave energy distribution scope and the grounding fault invasion wave main wave energy distribution scope. According to the method, the transformer station fault invasion waves can be identified to be the lightning fault invasion waves or the grounding fault invasion waves by utilizing different energy distribution scopes of the lightning fault invasion main waves and the grounding fault invasion main waves.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to an identification method and system for lightning fault intrusion waves and ground fault intrusion waves. Background technique [0002] The main causes of transmission line fault tripping include climatic factors (such as lightning damage, pollution flashover, strong wind, flood, etc.), non-climatic factors (such as bird damage, external force, trees and bamboos, etc.), equipment factors, and human factors (such as design, construction, etc.) , operation, etc.) and other unknown factors. [0003] Once lightning strikes and other ground faults occur on the transmission line, the impulse voltage will invade the substation along the transmission line, causing system overvoltage, and then affecting the performance of the primary and secondary equipment of the power grid. [0004] For the identification of lightning fault intrusion wave and ground fault intrusion wave, researches...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/001
Inventor 王红斌叶海峰吴昊黄勇周恩泽高雅李峰罗颖婷易潇然张国清陈沛琳
Owner GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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