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Method and device for locating high-resistance ground fault section of distribution network, and storage medium

A high-resistance ground fault and section positioning technology, which is applied to the fault location, measuring device, and fault detection according to the conductor type, can solve the problems of easy misjudgment and weak ability to withstand transition resistance, so as to improve accuracy, Strong applicability and reduced difficulty

Inactive Publication Date: 2019-12-06
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Embodiments of the present invention provide a method, device, and storage medium for locating a high-resistance ground fault section in a distribution network, which can effectively solve the problem of poor tolerance to transition resistance in the prior art and easy misjudgment when a high-resistance ground fault occurs problem, can accurately judge the fault section, and can effectively reduce the error of fault location judgment

Method used

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  • Method and device for locating high-resistance ground fault section of distribution network, and storage medium
  • Method and device for locating high-resistance ground fault section of distribution network, and storage medium
  • Method and device for locating high-resistance ground fault section of distribution network, and storage medium

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Embodiment 1

[0042] see figure 1 , is a schematic flowchart of a method for locating a high-resistance ground fault section in a distribution network provided in Embodiment 1 of the present invention, and the method includes steps S101 to S104.

[0043] S101. Obtain zero-sequence current and voltage wave recording data of each fault location terminal.

[0044] In an optional embodiment, the zero-sequence voltage sequence of the line busbar and the zero-sequence current sequence of the line feeder are acquired within a preset starting time threshold of zero-sequence voltage mutation, to obtain the zero-sequence current and voltage wave recording data. Exemplarily, the zero-sequence current and voltage of all lines are collected within the time range of 5ms before the start of the zero-sequence voltage mutation and 20ms after the start, and the sampling rate is f S =10kHz, get zero sequence voltage sequence u 0 (n) and zero-sequence current sequence i 0 (n).

[0045] S102. According to t...

Embodiment 2

[0064] see image 3 , is a schematic structural diagram of a positioning device for a high-resistance ground fault section of a distribution network provided in Embodiment 2 of the present invention, including:

[0065] A data acquisition module 201, configured to acquire the zero-sequence current and voltage recording data of each fault location terminal;

[0066] Calculation module 202, configured to calculate the average value of the absolute value of the current integral value and the voltage difference ratio collected by each terminal according to the zero-sequence current and voltage recording data;

[0067] The judging module 203 is used to calculate the average value ratio of each terminal and the next terminal according to the average value, and judge the size of the average value ratio and the preset setting threshold;

[0068] The fault location module 204 is used to record the average ratio and the number of the terminal when the average ratio is greater than the ...

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Abstract

The invention discloses a method and device for locating a high-resistance ground fault section of a distribution network, and a storage medium. The method for locating the high-resistance ground fault section of the distribution network comprises the following steps: obtaining zero-sequence current and voltage recording data of each fault location terminal; calculating the average value of the absolute value of the ratio of the current integral value and the voltage difference value collected by each terminal according to the zero-sequence current and voltage recording data; calculating the average value ratio of each terminal and the subsequent terminal according to the average value, and determining the size of the average value ratio and a preset setting threshold; and recording the average value ratio and the terminal number when the average value ratio is greater than the setting threshold, and determining that the ground fault section is the section between the terminal corresponding to the number and the subsequent terminal according to the number, so that the section determination result is obtained. The invention has strong applicability, can be applied to different faultlocations and different transition resistances, can effectively improve the accuracy of determining the fault section, can effectively reduce the difficulty of fault location and reduce errors, and has low cost and a high engineering application value.

Description

technical field [0001] The invention relates to the technical field of power system fault detection, in particular to a method, a device and a storage medium for locating a high-resistance ground fault section of a distribution network. Background technique [0002] The fault location of distribution network is of great significance to the study of distribution network faults. Efficient and accurate fault location methods are conducive to improving the reliability of distribution network power supply. At present, the research on fault analysis and location of the transmission network has been relatively complete, but for the distribution network, due to its complex structure, there are problems such as multi-level branches, ring networks, short line distances, and different grounding methods, which greatly increase This increases the difficulty of fault location, especially for high-resistance ground faults, and the difficulty of fault location is even greater. [0003] Tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
CPCG01R31/086G01R31/088Y04S10/52
Inventor 邹林
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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