Determination method for high resistance grounding fault of power distribution line

A high-resistance ground fault and judgment method technology, which is applied in the direction of fault location, measurement of electricity, and measurement of electrical variables, can solve difficult problems such as high-resistance ground fault protection, and achieve the effect of high sensitivity and good discrimination ability

Inactive Publication Date: 2018-12-25
GUIZHOU POWER GRID CO LTD
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Problems solved by technology

This method does not propose the distinguishing characteristics of high-resistance ground faults and normal operating...

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  • Determination method for high resistance grounding fault of power distribution line
  • Determination method for high resistance grounding fault of power distribution line
  • Determination method for high resistance grounding fault of power distribution line

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[0041] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, but not for limiting the protection scope of the present invention.

[0042] The method for judging high-resistance grounding faults of distribution lines in the present invention includes a fault intermittent detection and judgment process and a fault direction detection and judgment process. The fault direction detection process collects zero-sequence current traveling waves and zero-sequence voltage traveling waves, based on the The direction of the fault is obtained through judgment based on wave information; the fault intermittent detection and judgment process collects zero-sequence current, and judges based on zero-sequence current amplitude change data to obtain specific judgment results.

[0043] Among them, the fault direction ...

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Abstract

The invention discloses a determination method for a high resistance grounding fault of a power distribution line, comprising a fault intermittent detection and determination process and a fault direction detection and determination process. The fault direction detection process collects a zero-sequence current traveling wave and a zero-sequence voltage traveling wave, and judges based on the traveling wave information to obtain a direction in which the fault occurs. The fault intermittent detection and determination process collects zero-sequence current, and judges based on the zero-sequencecurrent amplitude change data to obtain a specific judgment result. According to the determination method for the high resistance grounding fault of the power distribution line, due to the adoption of directional components, the method is guaranteed to be selective in principle, and on the basis of this, the flexible adjustment of the threshold of intermittent fault characteristic detection makesthe method highly sensitive.

Description

technical field [0001] The invention belongs to the technical field of power system protection and control, in particular relates to distribution line protection and ground fault detection, in particular to a method for judging high-resistance ground faults of power distribution lines. Background technique [0002] A high-resistance ground fault is a harmful contact between a current-carrying conductor and a non-metallic conductive medium in a power system. The electrical properties of non-metallic conductive media limit the fault current. High-resistance ground faults are intermittent and instantaneous, with a short duration. The steady-state characteristics of high-resistance ground faults are not obvious, and traditional distribution line protection devices, such as overcurrent protection, cannot be detected correctly. [0003] The voltage and current changes caused by high-resistance ground faults are very small, similar to load changes, and even lower than the changes...

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/088Y04S10/52
Inventor 何鑫王永刚王宇恩蒲超廷刘岑俐杨万锦朱勇万春竹白加林赵武智牛静邬小坤赵凌熊学海
Owner GUIZHOU POWER GRID CO LTD
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