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Cable line fault positioning method, device and system

A fault location and cable line technology, applied in fault location, measurement device, information technology support system, etc., can solve problems such as difficult operation and complicated implementation, and achieve the effect of improving efficiency and ensuring safe and reliable operation.

Active Publication Date: 2015-04-08
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods generally have the defects of complex implementation and difficult operation

Method used

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  • Cable line fault positioning method, device and system
  • Cable line fault positioning method, device and system
  • Cable line fault positioning method, device and system

Examples

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Embodiment 1

[0029] Embodiment 1: A cable line fault location system as attached figure 1 As shown, it includes a remote master station 1 and several cable fault location devices 3 that are signal-connected with the remote master station 1 through a communication network 2, wherein the remote master station 1 is used for overall monitoring of the network formed by the cable connection , and each cable line fault location device 3 is used to realize the judgment of the location of the ground fault occurred in the cable line. The entire cable line network is composed of several lines connected, and each line is formed by connecting several sections of cables 4 , each section of cable 4 is equipped with at least one cable line fault location device 3 , which can be arranged at one end of the cable 4 . However, in this embodiment, in order to obtain more accurate location conclusions, cable line fault location devices 3 are provided at the first and last ends of each section of cable.

[0030...

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Abstract

The invention relates to a cable line fault positioning method. The cable line fault positioning method comprises the following steps of (1) setting an overflow threshold valve for line zero sequence current of every section of a cable, setting a inductance coefficient for sheath grounding current of every section of the cable and measuring the line zero sequence current and the sheath grounding current of every section of the cable; (2) judging fault positions, judging the section of the cable to be faulted when the line zero sequence current of the section of the cable is larger than the set overcurrent threshold value and judging the sheath grounding current of the section of the cable is larger than a product of the sensing coefficient and the line zero sequence current of the section of the cable. The invention also relates to a cable line fault positioning device and system applying the above method. According to the device and the system in combination with the method, the fault position of the cable line can be rapidly and accurately positioned, the fault corrective maintenance efficiency can be improved, and safe and reliable operation of the power grid is guaranteed.

Description

technical field [0001] The invention relates to a method for locating faults occurring in a cable line, as well as to a device and a system used therefor. Background technique [0002] Most of my country's 20kV medium voltage distribution network adopts the neutral point grounding operation mode through a small resistance. The fast and accurate location of distribution line faults, especially single-phase ground faults, is very important not only for repairing lines and ensuring reliable power supply, but also for ensuring the safe, stable and economical operation of the entire power system. The single-phase-to-ground fault in the distribution network is the most likely type of fault, so the fault location of the distribution network is mainly to solve the problem of accurate location of the single-phase-to-ground fault. [0003] At present, the 20kV medium voltage distribution network generally uses three-core cross-linked polyethylene XLPE power cables. The composition o...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/02
CPCY04S10/52
Inventor 朱国防董晓峰郭法安陈会吕培强
Owner STATE GRID CORP OF CHINA
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