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Fault diagnosis method and device for transformer station grounding network

A substation grounding grid, fault diagnosis technology, applied in the direction of fault location, measuring device, measuring electricity, etc.

Inactive Publication Date: 2018-05-08
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, only measuring the power frequency grounding impedance cannot represent the safe operation of the substation grounding network under fault conditions.

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  • Fault diagnosis method and device for transformer station grounding network
  • Fault diagnosis method and device for transformer station grounding network
  • Fault diagnosis method and device for transformer station grounding network

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Embodiment Construction

[0056] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0057] The technical problem solved by the present invention is to provide a substation grounding grid fault diagnosis method based on arbitrary current-voltage detection waveform frequency response analysis, that is, use an on-site arbitrary wave signal current generator to output a test signal current of a certain amplitude (> 10A, generally select 20A), applied to the ground down conductor of the substation grounding grid under evaluation, m...

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Abstract

The invention relates to a fault diagnosis method and device for transformer station grounding network. The method comprises the following steps of: 1, selecting a grounding state parameter test pointof a specific grounding down lead of the transformer station grounding network; 2, connecting a field arbitrary wave current signal combination generator, selecting a representative grounding down lead at a different location of the grounding network as a voltage response output terminal, and connecting the voltage response output terminal to a high-frequency data acquisition device; 3, obtainingthe frequency response process curves of the representative grounding down leads at different locations of the grounding network; 4, subjecting the curves to the combined correlation coefficient analysis; and 5, evaluating the running status of the grounding network according to a result of the combined correlation coefficient analysis. Compared with the prior art, the fault diagnosis method hasthe advantages of ensuring the safe and reliable operation of a power system, being simple, accurate, and not limited by field operating conditions.

Description

Technical field [0001] The present invention relates to a substation grounding grid fault technology, in particular to a substation grounding grid fault diagnosis method and device based on arbitrary current and voltage detection waveform frequency response analysis. Background technique [0002] The substation grounding grid is an important facility to ensure electrical equipment and personal safety. Since the grounding grid is buried underground, the grounding body is often thinned or even broken due to years of soil corrosion, which deteriorates the grounding performance of the grounding grid. At present, the detection of the grounding performance of the grounding grid in engineering is generally indirectly judged by the power frequency grounding resistance, but it is impossible to understand the corrosion of the grounding grid. Because as long as the grounding body at the measurement site does not break, even if the grounding grid is severely corroded, the power frequency gr...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/088Y04S10/52
Inventor 司文荣傅晨钊吴天逸陆启宇陆冰冰陈璐袁鹏
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO