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A Fault Location Method for Small Current Grounding System Suitable for Monitoring Branch Lines

A low-current grounding and monitoring point technology, used in fault locations, information technology support systems, etc.

Active Publication Date: 2018-06-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of fault location when single-phase grounding occurs in the small current grounding system of monitoring branch lines, and to provide a fault location method based on zero-mode current transient components

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  • A Fault Location Method for Small Current Grounding System Suitable for Monitoring Branch Lines
  • A Fault Location Method for Small Current Grounding System Suitable for Monitoring Branch Lines
  • A Fault Location Method for Small Current Grounding System Suitable for Monitoring Branch Lines

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Embodiment Construction

[0023] In order to achieve the above objectives, the present invention intends to implement the following technical solutions:

[0024] I. As attached figure 1 Shown is a low-current ground fault location system based on the distribution network automation system platform. It consists of a station terminal (small-current ground fault line selection device) installed inside the substation, a line terminal (FTU) installed at each monitoring point of the line, and The main control room is composed of a small current ground fault location master station and a communication network. The specific workflow of the positioning system is as follows:

[0025] 1) System workflow during normal operation

[0026] The feeder terminal in the line is always in the state of sampling the zero-mode current and zero-mode voltage (if possible) signals at each monitoring point of the line, and compares the zero-mode voltage sampling signal or the zero-mode current change with the device startup threshold ...

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Abstract

The invention discloses an undercurrent grounding system fault positioning method suitable for monitoring a branch line, belongs to the field of fault detection of a power distribution network, and brings forward a positioning method for determining a search path and finding out a fault section step by step through integrated utilization of a similarity and polarity relation between transient zero-mold currents of each monitoring point of the upstream and downstream of each section, for solving the problem of positioning a single-phase grounding fault in an undercurrent grounding mode distribution system for monitoring a branch line through a terminal. According to a fault line selection result, first of all, a first section of a fault line outlet is selected as an undetermined section, a correlation coefficient between the transient zero-mold currents of each monitoring point of the upstream and downstream of the undetermined section is calculated, and whether the undetermined section is a fault section is determined according to the correlation coefficient and a polarity feature; and if the undetermined section is a sound section, a next undetermined section is determined according to the amplitude size of the transient currents until the fault section is found. According to the invention, in actual application, the power distribution network has too many branches. The method provided by the invention solves the positioning problem in the distribution system for monitoring the branch line through the terminal and has a wide actual application value.

Description

Technical field [0001] The invention relates to a fault location method for a small current grounding system, which is suitable for a power distribution system in a small current grounding mode and belongs to the field of power distribution network fault detection. Background technique [0002] When a single-phase (small current) ground fault occurs in a small current grounding distribution network, based on the selection of the fault line, the distance to the fault point or the fault section can be determined, which can further reduce the fault search and repair time, and it will become a small current ground fault Hot spots and key points of research and application of detection technology. Traditional fault detection (line selection, location and ranging) methods using steady-state electrical quantities have problems such as inconspicuous, unstable or even uncertain fault quantities, and cannot guarantee the reliability and sensitivity of detection. After recent years of deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 薛永端徐丙垠宋伊宁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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