A method and system for local feeder fault isolation based on permanent fault identification

A permanent fault, fault isolation technology, applied in emergency protection circuit devices, electrical components and other directions, can solve the problem of many switching operations

Active Publication Date: 2020-04-28
XUCHANG XJ SOFTWARE TECH +2
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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 an on-site feeder fault isolation method based on permanent fault identification to solve the problem of many switching operations in the existing fault isolation method

Method used

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  • A method and system for local feeder fault isolation based on permanent fault identification
  • A method and system for local feeder fault isolation based on permanent fault identification
  • A method and system for local feeder fault isolation based on permanent fault identification

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Embodiment Construction

[0040] method embodiment

[0041] This embodiment provides an on-site feeder fault isolation method based on permanent fault identification, including the following steps:

[0042] 1) When a fault occurs on the distribution line, each section switch on the distribution line trips;

[0043] 2) Perform permanent fault discrimination for each tripped sub-section switch before each sub-section switch is closed. Generally, permanent fault identification is performed after the fault detection delay;

[0044]3) Closing control is performed according to the permanent fault identification result. Of course, a power distribution terminal or equipment for permanent fault judgment needs to be installed at each section switch. Then, for any section switch, if the section switch is judged as non-permanent fault (here, non-permanent fault refers to no fault or transient fault), that is, the power distribution terminal at the section switch is judged as non-permanent fault. If there is a pe...

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PUM

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Abstract

The invention relates to a local feeder line fault isolation method and system based on permanent fault identification. The method comprises the following steps of firstly, when a distribution line suffers from a fault, each section switch on the distribution line is tripped; and then permanent fault judgment is carried out on each section switch, and if any one section switch is judged to be in anon-permanent fault, the section switch is switched on after delay, and if the section switch is judged to be in a permanent fault, the section switch is not switched on. Therefore, the method only carries out a one-time of "stripping-switching on" process, and has the advantage of being small in switching action frequency, closing of the switch on a permanent fault can be avoided, and the systemhas the advantage of being small in impact on a distribution network system. Moreover, the method does not depend on a communication system, and does not need to be matched with a main station, so that the method is simple and reliable in process. In addition, the section switches do not need to be matched stage by stage, and the recovery power supply time of the fault isolation and non-fault sections is short, so that the recovery power supply speed of the fault isolation and non-fault sections is further accelerated.

Description

technical field [0001] The invention relates to an on-site feeder fault isolation method and system based on permanent fault identification. Background technique [0002] Feeder automation is an important function of distribution network automation, which is mainly implemented in two ways: local control mode and remote control mode. The traditional on-the-spot method is based on the successive trial closing of the sub-section switches at all levels of the line to realize fault isolation and power restoration of non-faulty sections. It has the disadvantages of many switching operations, long power restoration time, and multiple fault current shocks in case of permanent faults. . The remote control mode is realized by the distribution automation system, which relies on communication and has the disadvantages of large investment and low reliability. The local feeder automation method based on optical fiber differential protection proposed in recent years still has the disadva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 刘星李瑞生孟乐薛健民
Owner XUCHANG XJ SOFTWARE TECH
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