Method and device for positioning high-resistance grounding fault section of power 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, The effect of strong adaptability and difficulty reduction

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 has high adaptability

Method used

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  • Method and device for positioning high-resistance grounding fault section of power distribution network and storage medium
  • Method and device for positioning high-resistance grounding fault section of power distribution network and storage medium
  • Method and device for positioning high-resistance grounding fault section of power distribution network and storage medium

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Embodiment 1

[0048] 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 S106.

[0049] S101. Obtain the zero-mode current recording data of each fault segment terminal.

[0050] In an optional embodiment, in order to ensure a sufficient data window, the acquired zero-mode current recording data is the zero-mode current of the line within a preset starting time threshold of zero-mode current mutation. Exemplarily, the zero-mode current of all lines is collected within the time range of 5 ms before the sudden start of the zero-mode current and 20 ms after the start, and the sampling rate is f S = 10kHz.

[0051] S102. According to the zero-mode current recording data, select an initial zero-mode current wave head, and use the zero-mode current initial wave head as a reference point to align the traveling wave heads of the zer...

Embodiment 2

[0083] 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:

[0084] The data acquisition module 201 is used to acquire the zero-mode current recording data of each fault-fixed segment terminal;

[0085] The traveling wave head processing module 202 is configured to select the initial wave head of the zero-mode current according to the zero-mode current recording data, and align the zero-mode current recording data of each terminal with the initial wave head of the zero-mode current as a reference point traveling wave head;

[0086] A judging module 203, configured to judge the magnitude of the initial wave head of the zero-mode current and the preset rated current value;

[0087] The initial wave head judging module 204 is used to calculate each terminal after the fault and its subsequent wave head according to the initial wa...

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Abstract

The invention discloses a method and a device for positioning a high-resistance grounding fault section of a power distribution network and a storage medium. The method comprises the following steps of acquiring zero-mode current recording data of fault fixed-section terminals; selecting zero-mode current initial wave heads according to the zero-mode current recording data, and aligning travelingwave heads of the zero-mode current recording data of the terminals; when the amplitude values of the zero-mode current initial wave heads are not smaller than a rated current value, according to thezero-mode current initial wave heads, calculating a product integral of sampling points of each terminal and the next terminal after breakdown, and determining a first grounding fault section according to a calculation result, thereby obtaining an initial wave head judgment result; performing cross wavelet transformation on the zero-mode current recording data acquired by each terminal and the next terminal, and determining a second grounding fault section according to a transformation result, thereby obtaining a cross wavelet phase judgment result; and when the initial wave head judgment result and the cross wavelet phase judgment result are consistent, obtaining a fault fixed-section result. The fault section can be accurately judged; and the method and the device have relatively high adaptability.

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
CPCG01R31/086G01R31/088
Inventor 邹林
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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