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A high-resistance ground fault detection method and related device in a small-resistance grounding system

A high-resistance grounding fault and low-resistance grounding technology, applied in measurement devices, fault locations, and fault detection by conductor type, etc., can solve the problems of high fault conditions in the arc characteristic identification method and the lack of a large amount of field data in the artificial intelligence method. , to alleviate the limitations of data and fault conditions, improve applicability and efficiency, and achieve the effect of simple operation

Active Publication Date: 2022-03-01
GUANGDONG POWER GRID CO LTD +1
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AI Technical Summary

Problems solved by technology

However, the artificial intelligence method lacks a large amount of field data for training, and the arc characteristic identification method has too high requirements for fault conditions

Method used

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  • A high-resistance ground fault detection method and related device in a small-resistance grounding system
  • A high-resistance ground fault detection method and related device in a small-resistance grounding system
  • A high-resistance ground fault detection method and related device in a small-resistance grounding system

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Embodiment Construction

[0042] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0043] Compared with the prior art, the applicant believes that the circuit analysis method is simpler and clearer, and more suitable for practical application. Under the high-resistance ground fault, the transient component of the current at the line outlet contains a wealth of fault information. Using the Prony algorithm, the transient quantity of the zero-seque...

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Abstract

This application discloses a high-resistance grounding fault detection method and related devices in a small-resistance grounding system. The method includes: obtaining the zero-sequence current transient component amplitude at the exit of the target detection line; Extract the two attenuated DC component amplitudes of each line from the component amplitude; calculate the amplitude ratio of each line according to the two attenuated DC component amplitudes; if the corresponding amplitude ratios of all target detection lines are under the preset ratio rule If the current amplitude ratio of one line in the target detection line is not approximately equal to the amplitude ratios corresponding to all other lines under the preset ratio rules, it is judged that the current amplitude ratio corresponds to There is a problem with the wiring. The present application can alleviate the technical problems of limitations in data and fault conditions in the actual fault detection process in the prior art.

Description

technical field [0001] The present application relates to the technical field of high-resistance line selection in a small-resistance grounding system, and in particular to a detection method and a related device for a high-resistance grounding fault in a small-resistance grounding system. Background technique [0002] Traditionally, the common line selection method for ground faults in small resistance grounding systems is definite time overcurrent protection. This method needs to consider the influence of the maximum unbalanced current and set a higher overcurrent protection setting value, so it cannot realize high-impedance fault line selection. However, when a high-resistance grounding fault occurs, the fault characteristic quantity of the system is very small, how to effectively use the fault characteristic quantity of high-resistance grounding is a prominent problem in line selection of the current small resistance grounding system. [0003] At present, the methods fo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088G01R31/52
Inventor 谭振鹏区伟潮陈锦荣李高明李响彭飞进李国平林涛声邱桂华曾晓丹邓智广张文骏岳朝辉何引生
Owner GUANGDONG POWER GRID CO LTD
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