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Power distribution network single-phase earth fault positioning method and device based on zero-sequence current continuous adjustment, and readable storage medium

A zero-sequence current, distribution network technology, applied in the field of distribution network, to achieve the effect of amplifying fault characteristics, accurate positioning, and wide application range

Pending Publication Date: 2022-07-01
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a brand-new single-phase ground fault location method, device and readable storage medium of distribution network based on zero-sequence current continuous adjustment, wherein, the location method uses a brand-new technical idea to solve the problem of fault location The problem is that by continuously adjusting and amplifying the zero-sequence current for multiple times, it is convenient for the device to detect and extract fault steady-state feature quantities, and realize accurate positioning of fault feeders and fault sections

Method used

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  • Power distribution network single-phase earth fault positioning method and device based on zero-sequence current continuous adjustment, and readable storage medium
  • Power distribution network single-phase earth fault positioning method and device based on zero-sequence current continuous adjustment, and readable storage medium
  • Power distribution network single-phase earth fault positioning method and device based on zero-sequence current continuous adjustment, and readable storage medium

Examples

Experimental program
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Effect test

Embodiment 1

[0127] The method for locating a single-phase-to-ground fault in a distribution network based on the continuous adjustment of zero-sequence current provided by this embodiment is based on the theoretical elaboration of the above third part. When applied to fault feeder location, the method includes the following steps:

[0128] The injected current signal regulates the neutral point voltage successively, and collects the zero-sequence current on each feeder after each regulation;

[0129] Calculate the variation of the zero-sequence current amplitude of each feeder;

[0130] Among them, the feeder with the largest variation is the faulty feeder.

[0131] It should be noted that, when adjusting the neutral point voltage successively, it is preferable to adjust according to the aforementioned adjustment range determined by the transition resistance. Furthermore, the present invention can realize the identification of the faulty feeder and the faulty section under the adjustment,...

Embodiment 2

[0141] The present invention provides a method for locating a single-phase grounding fault in a distribution network based on continuous adjustment of zero-sequence current, in which the faulty feeder is known (the faulty feeder can be determined in the manner of Embodiment 1 or the faulty feeder can be determined in other ways), and the known faulty feeder Identify the faulted section on the faulted feeder and apply it to the faulted section location of the faulted feeder, and when it is a non-high-resistance grounding fault, the following steps are also included:

[0142] The injected current regulates the neutral point voltage successively, and collects the zero-sequence currents at both ends of each section on the faulty feeder after each regulation and calculates the magnitude of the difference between the zero-sequence currents at both ends of each section;

[0143] Then calculate the cumulative amplitude of each section based on the amplitude of the zero-sequence current...

Embodiment 3

[0146] The present invention provides a method for locating a single-phase grounding fault in a distribution network based on continuous adjustment of zero-sequence current. The faulted feeder is known, and the faulted section is identified on the known faulted feeder, which is applied to the faulted section location of the faulted feeder. , and is applicable to non-high-resistance ground faults and high-resistance ground faults, and also includes the following steps:

[0147] The injected current regulates the neutral point voltage successively, and collects the zero-sequence currents at both ends of each section on the faulty feeder after each regulation and calculates the magnitude of the difference between the zero-sequence currents at both ends of each section;

[0148] Based on the amplitude of the zero-sequence current difference obtained by each section in each regulation, calculate the cumulative amplitude of each section and identify the amplitude variation trend of e...

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Abstract

The invention discloses a power distribution network single-phase earth fault positioning method and device based on zero-sequence current continuous regulation and a readable storage medium. When the positioning method is applied to fault feeder line positioning, neutral point voltage is regulated and controlled successively, and zero-sequence current on each feeder line after regulation and control each time is collected; calculating the variation of the zero sequence current amplitude of each feeder line, wherein the feeder line with the maximum variation is a fault feeder line; when the method is suitable for positioning a fault section, the fault section is identified by utilizing the accumulated amplitude of each section or the fault section is identified by utilizing the accumulated amplitude and the change trend of each section according to successive regulation and control of neutral point voltage. According to the invention, the problem of fault positioning is solved by a brand new technical thought, and the accuracy of line selection and positioning is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of distribution networks, and in particular relates to a method, device and readable storage medium for locating a single-phase grounding fault in a distribution network based on zero-sequence current continuous adjustment. Background technique [0002] The distribution network in my country generally adopts the operation mode of non-effective grounding of the neutral point. And the accuracy of fault section location needs to be further improved. Especially, for the resonant grounding system, due to the compensation effect of the arc suppression coil, the power frequency current in the fault section has no obvious fault characteristics compared with the non-fault section. Especially when a high-resistance single-phase grounding fault occurs, the fault location is quite difficult due to factors such as weak fault current and unstable grounding arc. In the key tasks issued by the State Grid Corporation of Chi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 冯光喻锟陈明王鹏刘斯琪赵健曾祥君李理徐铭铭董轩郭祥富郭剑黎罗晗菁杨理斌唐斌
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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