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Small current ground fault location method and system, computer equipment and medium

A small current grounding and fault location technology, applied in fault location, information technology support system, fault detection according to conductor type, etc. The effect of wide practical application value

Active Publication Date: 2022-07-26
SHENZHEN POWER SUPPLY BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of fault detection (line selection, positioning and distance measurement) using steady-state electrical quantities has problems such as insignificant, unstable or even uncertain fault quantities, which cannot guarantee the reliability and sensitivity of detection

Method used

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  • Small current ground fault location method and system, computer equipment and medium
  • Small current ground fault location method and system, computer equipment and medium
  • Small current ground fault location method and system, computer equipment and medium

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Embodiment 1 of the present invention provides a method for locating a small current grounding fault, which includes the following steps:

[0052] Step S201, receiving in real time the zero-mode current recording data of each monitoring node of the line when the line fails; wherein, each line is divided into multiple sections, and each section is provided with multiple monitoring nodes;

[0053] Step S202, extracting the transient component of the zero-mode current wave recording data, and determining its transient amplitude and transient resonance frequency according to the transient component;

[0054] Step S203, generating the transient characteristic quantity of each monitoring node according to the transient amplitude and the transient resonance frequency;

[0055] Step S204: Determine the section where the fault point is located according to the transient characteristic quantities of the monitoring nodes.

[0056] Specifically, at the moment when the line small cur...

Embodiment 2

[0104] like Figure 7 As shown, the second embodiment of the present invention provides a low-current grounding fault location system, which is used to implement the low-current grounding fault location method described in the first embodiment, including:

[0105] The data receiving unit 1 is used to receive the zero-mode current recording data of each monitoring node of the line in real time when the line fails; wherein, each line is divided into a plurality of sections, and each section is provided with a plurality of monitoring nodes;

[0106] Data processing unit 2, for extracting the transient component of the zero-mode current wave recording data, and determining its transient amplitude and transient resonance frequency according to the transient component;

[0107] A feature quantity generating unit 3, configured to generate a transient feature quantity of each monitoring node according to the transient amplitude value and the transient resonance frequency;

[0108] Th...

Embodiment 3

[0114] Embodiment 3 of the present invention provides a computer device, including: the low-current ground fault location system according to the embodiment; or, a memory and a processor, wherein the memory stores computer-readable instructions, and the computer-readable instructions When executed by the processor, the processor is caused to execute the steps of the method for locating a small current ground fault according to Embodiment 1.

[0115] Of course, the computer device may also have components such as a wired or wireless network interface, a keyboard, and an input / output interface for input and output, and the computer device may also include other components for implementing device functions, which will not be repeated here.

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Abstract

The present invention provides a small-current grounding fault location method, system, computer equipment, and medium, including the following steps: receiving in real time the zero-mode current recording data of each monitoring node of the line when the line is faulty; wherein, each line is divided into multiple Each section is provided with multiple monitoring nodes; the transient components of the zero-mode current recording data are extracted, and the transient amplitude and transient resonance frequency are determined according to the transient components; The transient characteristic quantity of each monitoring node is generated by the state amplitude and the transient resonance frequency; the section where the fault point is located is determined according to the transient characteristic quantity of each monitoring node. The invention can improve the reliability and sensitivity of low-current grounding fault location detection, find and isolate the grounding fault location in time, and ensure the safe and stable operation of the power distribution network and power distribution equipment.

Description

technical field [0001] The invention relates to the field of distribution network fault processing, in particular to a small-current grounding fault location method and its system, computer equipment and medium. Background technique [0002] The 6~35kV medium voltage distribution network in my country mostly adopts the small current grounding method, which is called the small current grounding system. When a single-phase grounding fault occurs in a small-current grounding system, the fault current is very small, so it is called a small-current grounding fault. Due to the weak fault signal, it is very difficult to detect, select and locate small current ground faults. After a small current ground fault occurs, the three-phase voltage of the system is still symmetrical, and it can run for a period of time with the fault to improve the reliability of the power supply. However, it cannot run with faults for a long time. The intermittent arc ground faults that are common in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086Y04S10/52
Inventor 李国栋黄福全张海台王廷凰刘子俊
Owner SHENZHEN POWER SUPPLY BUREAU