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Method for positioning grounding failure region of feed line in low-current grounding system

A technology of small current grounding and section positioning, applied in the direction of fault location, etc., can solve the problems that cannot meet the development requirements of automatic identification and isolation of feeder automation fault sections

Inactive Publication Date: 2003-02-19
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

The above-mentioned patent application and the existing single-phase ground fault protection only realize the function of ground fault line selection. Generally, it is necessary to collect and compare the power information of each outgoing line to determine the single-phase ground fault line, which cannot be adapted to automatic identification and isolation of feeder automatic fault sections. development requirements

Method used

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  • Method for positioning grounding failure region of feed line in low-current grounding system
  • Method for positioning grounding failure region of feed line in low-current grounding system

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Embodiment Construction

[0014] The basis of this method is that each section switch on the feeder is equipped with three-phase voltage and current sensors, and there are communication channels between them. The general idea is: 1) monitor the zero-sequence voltage and zero-sequence current at each distribution switch on the feeder; 2) determine the system fault if the zero-sequence voltage is greater than the set value; 3) calculate the zero-sequence voltage flowing through each switch before and after the fault Calculate the amount of current change, and calculate the zero-sequence current flowing into the section from each section switch of the section; 4) According to the amplitude and phase characteristics of the zero-sequence current flowing into each section on the feeder line, the fault state of the feeder can be determined and the fault area can be located part.

[0015] Taking the small distribution network system with two outgoing lines as an example, the two outgoing lines are divided into...

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Abstract

A method for determining the grounding failure segment of feed line in low-current grounding system includes monitoring the zero sequence voltage and current of each distribution switch on a feed line, judging system failure if the zero sequence voltage is greater than a setting value, calculating the variation of zero sequence current of each switch to find out the zero sequence current flowing from all the switch into the segment, and judging the failure state and position according to the ampletude and phase characteristics of the zero sequence current flowing into different segments.

Description

technical field [0001] The invention relates to a fault section positioning and isolation technology of a power distribution system and a power system relay protection technology, in particular to a method for locating a ground fault section of a feeder line of a small current grounding system. Background technique [0002] Although a single-phase ground fault in a small current grounding system does not form a short circuit, it may cause serious secondary accidents, and the fault section must be quickly found. Traditional reclosers and sectionalizers for isolating faulty sections cannot solve the problem of single-phase grounding fault isolation in small current grounding systems. The existing relay protection device can only identify the faulty line from the multiple outgoing lines of the power station (that is, the single-phase grounding line selection device of the microcomputer). [0003] The invention patent application published on September 06, 2000 with the applica...

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Application Information

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IPC IPC(8): G01R31/08
Inventor 夏雨姚月娥李泰军刘全志王章启
Owner HUAZHONG UNIV OF SCI & TECH
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