Transformer station grounding network corrosion detecting system based on earth surface potential, and method thereof

Abstract

The invention relates to a transformer station grounding network corrosion detecting system based on an earth surface potential, and a method thereof. The transformer station grounding network corrosion detecting system comprises the components of a current injection device which is connected with a random reachable node of the grounding network and injects a sinusoidal AC current that is different from an industrial frequency current, wherein the AC current is injected through the random reachable node of the grounding network; a potential probe which is arranged right above the earth surface of a grounding network conductor and is used for measuring potential distribution on the earth surface right above the earth surface of the conductor, detecting the potential signal of the earth surface and filtering an industrial frequency interference; a signal testing module which is connected with the potential probe and is used for receiving the potential signal that is transmitted by the potential probe, performing filtering and amplification on the potential signal, and calculating and storing a potential component that corresponds with the frequency of the injected current; and an analyzing and displaying terminal which is connected with the signal testing module and is used for receiving potential data that are transmitted by the signal testing module. Compared with the prior art, the transformer station grounding network corrosion detecting system has advantages such as ensuring high safety and stable operation of a transformer station.

Description

technical field [0001] The invention relates to a substation grounding grid corrosion detection system, in particular to a substation grounding grid corrosion detection system and method based on surface potential. Background technique [0002] The grounding grid is an important part of the substation. It provides a common potential reference point for various equipment in the substation, and provides a current discharge channel when the power system has a short-circuit fault or is struck by lightning. The reliability of its work is crucial to the safety and stability of the power system. The operational impact is significant. [0003] The substation grounding grid has been buried underground for a long time, and is often corroded by the electrochemical action of the soil. The corrosion of the grounding grid is a gradual process. If it is corroded to a certain extent, it will cause a fault, and if it is more serious, it will break. Most of the existing grounding grids in m...

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Problems solved by technology

However, this method is interfered by the complex electromagnetic environment at the substation site, and it is difficult to accurately judge the specific fault location, and it is also difficult to make an accurate diagnosis of the corroded but unbroken conductor

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