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Small current grounding fault line selection system

A technology of small current grounding and fault line selection, which is applied in the field of power transmission and transformation of power systems, can solve problems such as being susceptible to interference, not easy to eliminate, and large interference signals, and achieve the effect of improving detection sensitivity

Inactive Publication Date: 2017-09-05
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The periodic interference signal of the power system is generally relatively large, and it is not easy to eliminate
Therefore, the working signal is periodic and is easily disturbed, and the working signal is not easy to extract

Method used

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  • Small current grounding fault line selection system
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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0014] The small current grounding fault line selection system of the present invention is composed of a signal generator and a signal detector.

[0015] figure 1 Shows how the three output terminals of the signal generator are respectively connected to the phases a, b, and c of the secondary sides of the voltage transformer TV on the bus. The small current ground fault line selection system measures the voltage of the three phases a, b, and c on the secondary side of the TV. When the voltage of one phase drops and the voltage of the other two phases rises, it can be judged that a single-phase ground fault occurs in the power system and the voltage drops The phase difference is the fault phase difference.

[0016] When the small current ground fault line selection system detects a single-phase ground fault, the signal generator sends a signal to the f...

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PUM

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Abstract

The invention discloses a small current grounding fault line selection system, which is composed of a signal generator and a signal detector, and is characterized in that the signal generator sends a known non-periodic pulse signal to a fault phase through a TV secondary side when the small current grounding fault line selection system detects occurrence of a single-phase grounding fault; the output of a zero-sequence current transformer TA of each line is connected to an input end of the signal detector; the signal detector filters various interference signals and extracts a known non-periodic operating pulse signal of each line; the known non-periodic operating pulse signals of the lines are compared, and the line with the maximum pulse signal is a fault line.

Description

technical field [0001] The invention relates to the technical field of electric power transmission and transformation, in particular to a line selection system for small current grounding faults. Background technique [0002] When a single-phase ground fault occurs in a small ground current system, the power system is allowed to continue running for a period of time. However, the small current grounding fault line selection system must send out an alarm signal to select the faulty line, and the operator on duty will handle it accordingly, and finally carry out power-off maintenance on the faulty line. It is easy to realize whether a single-phase ground fault occurs by the small current ground fault line selection system. However, since the capacitive current is small when a single-phase ground fault occurs in a small ground current system, it is difficult to determine which line is faulty. So far, there is no very effective way to solve it at home and abroad. [0003] Pat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/08
CPCG01R31/085G01R31/50
Inventor 冯忠奎王辉周刚刘泊辰徐天锡刘刚刘广张卫东王毅崔炎孟庆刚周宝凤张学绢高原马力远昝浩张海强
Owner STATE GRID SHANDONG ELECTRIC POWER