Method and apparatus for single phase ground fault route selection of low-current grounding power network

A single-phase ground fault, small current grounding technology, applied in the direction of circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as automatic line selection, and achieve the effect of reducing the number of misoperations

Inactive Publication Date: 2004-11-17
北京丹华昊博电力科技有限公司
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Problems solved by technology

The purpose of this invention is to solve the problem of automatic line selection when a single-phase ground fault occurs in a small current grounding system

Method used

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  • Method and apparatus for single phase ground fault route selection of low-current grounding power network
  • Method and apparatus for single phase ground fault route selection of low-current grounding power network
  • Method and apparatus for single phase ground fault route selection of low-current grounding power network

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Embodiment Construction

[0020]Proposed and adopted the intelligent amplitude and phase comparison algorithm, which uses integral algorithm, Butterworth digital filter, constant zero-sequence voltage as the reference positive direction and other algorithms on the basis of the amplitude and phase comparison algorithm, supplemented by continuous judgment and other anti-interference Measures, effective domain constraints, and comprehensive criteria have fundamentally improved the accuracy of line selection; combined with the new PT wiring method, the misjudgment problem caused by ferromagnetic resonance has been eliminated.

[0021] The wavelet method is proposed. The wavelet line selection method uses the transient current and harmonic current generated by the single-phase ground fault as the basis for line selection judgment. Since the equivalent circuit of a single-phase ground fault in a small-current grounded power grid is a capacitive path, the transient current generated in the circuit by the sudde...

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Abstract

The invention is a kind of one-way grounded failure selecting method and the device for a kind of small-current grounding electric network: at first, a 10kV physical simulating lab for the small-current grounding select is crated. The lab system discloses the essence of the running principle and the grounding failure of the small-current grounding electric network, it reappears some failures such as arc light grounding, intermittent arc light grounding, large-resistance grounding, and instable large-resistance grounding. And it researches the intelligent colony amplitude and phase comparing method, wavelet method, sample constructing method, current mutating method, network method which is suitable for each kind of grounding modes such as non-slip point grounding and non-slip point grounding through the arc eliminating coil; it provides the effective region analysis and the continuous judgment technology in the first; and it provides and uses the evidence theory, failure measuring theory, coarse group theory and several criteria intelligent fusion idea.

Description

[0001] Field: [0002] The invention relates to a line selection method for a single-phase grounding fault in a power grid, especially a method and device for a single-phase grounding fault line selection in a small-current grounding power grid. When the phase is grounded, the device can automatically select the grounded line. technical background: [0003] The automatic line selection of single-phase ground fault in small current grounding power grid (hereinafter referred to as small current grounding line selection) is an old problem that has been studied for many years. As early as the 1950s, some people began to study it, but until the 1970s, the research work did not make great progress. In the 1980s, the emergence of microcomputers provided hardware conditions for the selection of small current grounding lines. The Electric Control Research Office of North China Electric Power University seized this opportunity and first proposed the method of group amplitude comparison...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/28H02J13/00
Inventor 杨以涵李砚
Owner 北京丹华昊博电力科技有限公司
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