Power distribution network single-phase earth fault identification method and device and terminal equipment

Abstract

The invention provides a power distribution network single-phase earth fault identification method and device, and terminal equipment. The method comprises the steps of obtaining a fault phase voltage waveform of a target power distribution network main transformer; performing wavelet decomposition on the fault phase voltage waveform, extracting a target frequency band component of the fault phase voltage waveform after wavelet decomposition, performing morphological processing on the target frequency band component, and obtaining a fault pulse signal; extracting an amplitude sequence of the fault pulse signal, and comparing each amplitude in the amplitude sequence with a preset amplitude to obtain an arc reignition frequency; determining that the single-phase earth fault of the target power distribution network is an intermittent arc fault if the arc reignition frequency is greater than a preset frequency, and determining that the single-phase earth fault of the target power distribution network is a permanent earth fault if the arc reignition frequency is not greater than the preset frequency. According to the power distribution network single-phase earth fault identification method and device and the terminal equipment provided by the invention, higher fault identification efficiency and higher fault identification precision can be improved.

Description

technical field [0001] The invention belongs to the technical field of fault identification, and more specifically relates to a single-phase ground fault identification method, device and terminal equipment of a distribution network. Background technique [0002] The single-phase ground fault is a common fault in the power system, which means that one of the three-phase systems in the distribution network is short-circuited to the ground. Single-phase ground faults will bring many hazards, mainly including hazards to substation equipment, power distribution equipment, power distribution grid, human and animal safety, and power supply reliability. After a single-phase ground fault occurs, a resonant overvoltage may also occur, which is several times the normal voltage, endangering the insulation of the substation equipment, and in severe cases, the insulation breakdown of the substation equipment will cause a greater accident. Therefore, how to effectively identify single-ph...

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Problems solved by technology

[0003] In the existing technology, the fault identification is mainly realized by manually analyzing the voltage waveform of the fault phase of the distribution network, which depends on the experience level of the analyst, so the identification efficiency and identification accuracy need to be improved

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