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A method of line selection for single-phase disconnection fault in distribution network

A technology of disconnection fault and line selection method, which is applied in the fault location, fault detection according to conductor type, short circuit test and other directions, can solve the problem of long fault line inspection time, etc. The effect of fault line patrol time

Active Publication Date: 2020-12-29
国网浙江省电力有限公司丽水供电公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves the problem of long fault line inspection time, and provides a single-phase disconnection fault line selection method for distribution network that can greatly shorten fault line inspection time, bring convenience to fault repair and fault recovery, and reduce line power outage time

Method used

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  • A method of line selection for single-phase disconnection fault in distribution network
  • A method of line selection for single-phase disconnection fault in distribution network
  • A method of line selection for single-phase disconnection fault in distribution network

Examples

Experimental program
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Effect test

Embodiment 1

[0032] In this embodiment, a single-phase disconnection fault line selection method of distribution network, such as figure 1 shown, including the following steps:

[0033] S1: Analyze the topology of the distribution network system, collect the code of each line in the distribution network and the level of the line in the paired network, and the level will decrease as the lines between the line and the power supply increase;

[0034] S2: Collect the voltage and current at the outlet of the line;

[0035] S3: Calculate the positive sequence current mutation amount ΔI of the line i , if |ΔI i |>I f.set , then go to the next step, if |ΔI i |≤I f.set , then repeat this step, I f.set is the magnitude of the positive-sequence current mutation caused by the start-up of high-power loads in the distribution network;

[0036] S4: Calculate the positive sequence voltage mutation amount ΔV of the line i , if |ΔV i |f.set , then go to the next step, if |ΔV i |≥V f.set , then re...

Embodiment 2

[0043] Compared with Example 1, this embodiment simulates a single-phase disconnection fault in the Liancheng Zhoukeng branch line, and the line impedance of each line after the Liancheng Zhoukeng branch line fault is as follows Figure 5 As shown, the fault path line is Zhoukeng branch line-Liancheng Zhoukeng branch line, and the level of Liancheng Zhoukeng branch line is the lowest, and the result of line selection is in line with the actual situation.

Embodiment 3

[0045] Compared with Embodiment 1, this embodiment simulates a single-phase disconnection fault on the branch line of the surrounding pit, and the line impedance of each line after the fault of the branch line of the surrounding pit is as follows Figure 6 As shown, the fault path line is the Zhoukeng branch line, and the Zhoukeng branch line has the lowest level, and the line selection results are in line with the actual situation.

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Abstract

The invention relates to a line selection method for a single-phase disconnection fault of a power distribution network. The method comprises the following steps of analyzing a topological structure of a distribution network system, collecting voltage and current at a line outlet, calculating the abrupt change amount of positive sequence current of a line, comparing the abrupt change amount of thepositive sequence current of the line with a graph variable threshold value of the positive sequence current, calculating the abrupt change amount of positive sequence voltage of the line, and comparing the abrupt change amount of the positive sequence voltage with an abrupt change amount threshold value of the positive sequence voltage; calculating a line impedance, comparing the line impedancewith a line impedance threshold value to obtain fault path lines, and finally selecting the lowest line in the middle level of the fault path lines as the faulted line. The method has the advantages that the fault line patrol time can be greatly shortened, correspondingly convenience is brought for emergency fault correction and fault recovery, power failure time of the lines is shortened, and thepower supply reliability of the power distribution network is improved.

Description

technical field [0001] The invention relates to the technical field of power system operation, in particular to a line selection method for a single-phase disconnection fault in a distribution network. Background technique [0002] In recent years, the requirements for the distribution network system to accept distributed power sources such as photovoltaic stations, wind power, and small hydropower have become lower and lower. Due to frequent lightning strikes, aging connectors, or damage from external forces in remote mountainous areas, accidents of single-phase disconnection faults occur from time to time. occur. Due to the particularity of the geographical environment, it usually takes three to four hours to search for faults on the line, which will cause events such as small hydropower abandoning water, wind power abandoning wind, photovoltaic abandoning light, etc., causing distributed power owners to suffer economic losses. In addition, fault inspection Line time is t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/54G01R31/52G01R31/58
CPCG01R31/086G01R31/50
Inventor 郑涛金驰超于同飞王超李建军潘奕颖朱厚堃吴伊婷陈新宇吴婧
Owner 国网浙江省电力有限公司丽水供电公司