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Earth fault judging method for overhead line fault indicator

A fault indicator and ground fault technology, applied in the field of power grid, can solve the problems of rough judgment, misjudgment or non-judgment of system influence, low accuracy, etc., and achieve high judgment reliability, improved accuracy, and short injection time Effect

Active Publication Date: 2012-06-13
SIEYUAN ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its fault judgment method has certain shortcomings: when a ground fault occurs in the system, the fifth harmonic signal of the system itself is small, and it is easily affected by the fault type and the power grid system, and the fault judgment is unreliable and accurate.
Most of these technologies use simple analog circuits to sample the fault signal of the line itself to judge the fault of the line. , has a certain degree of accuracy, but for ground faults with small fault signal characteristics, it cannot be accurately judged

Method used

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  • Earth fault judging method for overhead line fault indicator
  • Earth fault judging method for overhead line fault indicator
  • Earth fault judging method for overhead line fault indicator

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Embodiment Construction

[0017] The embodiments of the present invention will be described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention. Detailed implementation modes and specific operation procedures are given, but the protection scope of the present invention is not limited to the following implementations. example.

[0018] Such as figure 1 with figure 2 As shown, this embodiment includes the following steps:

[0019] The first step is to install the fifth harmonic generator 3 in the substation. The voltage measuring terminal and the fifth harmonic output terminal of the fifth harmonic generator 3 are connected in parallel with the open triangle of the three-phase voltage transformer 2; The indicators 5 are distributed and installed on the overhead lines 6;

[0020] The fifth harmonic generator is based on the PC104 module and the DSP module as the core components. It is used to monitor the open triangle zero sequence voltage of the sy...

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Abstract

The invention discloses an earth fault judging method for an overhead line fault indicator in the technical field of power grids. A voltage signal on an open-delta side of a three-phase potential transformer on a bus of a power grid to be detected is introduced into a signal output end of a quintuple harmonic generator; a plurality of fault indicators are arranged on a plurality of sections of overhead power lines of the power grid to be detected; and after a permanent earth fault reaches the judging time, the quintuple harmonic generator outputs specific coding waves communicating between a system power supply and a fault line of an earth point to the power grid to be detected through the open-delta side of the three-phase potential transformer so as to realize earth fault positioning. The earth fault judging method avoids the defects of the conventional fault indicators in distribution network system application and improves the accuracy of judging the earth fault.

Description

Technical field [0001] The invention relates to a method in the technical field of power grids, in particular to a ground fault determination method for overhead line fault indicators. Background technique [0002] Most of the line faults in the power grid occur in the distribution network, which directly affects social production. It is very important to locate the fault point in time and accurately. In recent years, the application of overhead line fault indicators has brought great convenience to fault finding and has been widely used in power grids. However, most of the distribution networks in my country are neutral point ungrounded systems or low current grounded systems. For short-circuit faults with large fault currents, the fault indicator has a certain accuracy. For ground faults, the accuracy of the fault indicator is greatly reduce. Although product manufacturers and research institutions have conducted in-depth research on this issue, they have not made breakthrough...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/02
CPCY04S10/522Y04S10/52
Inventor 李刚魏立新罗晓刘彬赵鸿运
Owner SIEYUAN ELECTRIC CO LTD
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