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A high-resistance ground fault section location method for resonant ground distribution network

A high-impedance grounding fault and resonant grounding technology, which is applied in the direction of fault location, fault detection according to conductor type, information technology support system, etc., can solve problems such as the difficulty in locating the fault section of the resonant grounding system, and achieve strong practicability and low cost Low, wide range of effects

Active Publication Date: 2022-05-24
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for high-resistance ground faults that are difficult to locate, it is still a difficult task to locate the fault section of the resonant ground system based on FTU. Therefore, it is necessary to find an efficient and accurate fault location method to improve the reliability of power supply in the distribution network. sex

Method used

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  • A high-resistance ground fault section location method for resonant ground distribution network
  • A high-resistance ground fault section location method for resonant ground distribution network
  • A high-resistance ground fault section location method for resonant ground distribution network

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Embodiment

[0024] like figure 1 As shown, a method for locating a high-resistance grounding fault section of a resonant grounding distribution network in this embodiment mainly includes the following steps:

[0025] S1. Use the feeder terminal unit FTU to monitor the bus zero-sequence voltage. If the zero-sequence voltage mutation is greater than the start-up threshold, locate the fault section.

[0026] In this embodiment, the starting criterion of the fault section location method is as follows:

[0027] Δu 0 ≥U 0_set

[0028] where Δu 0 is the abrupt change of zero-sequence voltage in one power frequency cycle; U 0_set In order to start the threshold value, it can be set by avoiding the maximum three-phase unbalanced voltage, namely U 0_set =k th U n , k th is a reliability factor equal to 0.15, U n is the rated phase voltage of the resonant grounded system.

[0029] S2, through each feeder terminal unit FTU i Obtain the fault recorder data of zero-sequence current and zer...

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Abstract

The invention discloses a method for locating a high-resistance grounding fault section of a resonant grounding distribution network, which comprises the following steps: FTU monitors bus zero-sequence voltage; acquires fault recording data of zero-sequence current and zero-sequence voltage; acquires zero-sequence guide and upload the result to the master station of distribution automation; calculate the ratio R of the maximum value of zero-sequence admittance uploaded by adjacent FTUs i,j ;Rate the ratio greater than the threshold value of R i,j denoted as D k , calculate D k number; if there are multiple D k , execute the maximum difference absolute value criterion; if the maximum difference absolute value is less than 2, the fault section is located at the end of the line, otherwise, it is located at the FTU i with FTU j between; output the results of the fixed segment, and the positioning ends. The invention has good universality, and can accurately identify fault sections for different fault locations, transition resistances, fault closing angles and access of distributed power sources.

Description

technical field [0001] The invention relates to the field of power system fault detection and fault location, in particular to a method for locating a high-resistance grounding fault section of a resonant grounding distribution network. Background technique [0002] High-resistance ground faults caused by damaged conductors contacting non-ideal high-resistance media (eg, sand, asphalt, pavement, and tree branches) are a persistent problem in resonant-grounded distribution networks. The weak and unstable characteristics of the fault electrical quantity are the significant characteristics of high-resistance grounding faults. Existing overcurrent relays cannot easily detect or locate high-resistance grounding faults. Fire hazard, resulting in a further expansion of the fault range and affecting the reliability of the power supply. [0003] At the same time, due to the widespread access of distributed power generation (DG), especially inverter distributed power generation (IIDG...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086Y04S10/52
Inventor 王钢李杰曾德辉汪隆君毕浩然李松奕兰金晨
Owner SOUTH CHINA UNIV OF TECH