Grounding network corrosion diagnosis method based on endogenous EIT

Abstract

The invention discloses a grounding network corrosion diagnosis method based on endogenous EIT. According to the grounding network corrosion diagnosis method, the potential of a grounding network down lead wire is measured by cyclically injecting a small current into a grounding network, the corresponding inverse problem model of grounding network field domain resistivity distribution is established by using the acquired potential data, the injected current size and the corresponding geometric position, the inverse problem is solved by using a regularization applied Newton iteration algorithm to obtain the grounding network field domain resistivity distribution, an image treatment is performed to form a grounding network field domain resistivity distribution image, and the corrosion state and the fracture condition of the grounding network can be judged through the image. According to the present invention, the whole diagnosis method has advantages of no damage, no requirement of excavation and low cost, and can experiment the corrosion diagnosis and the state estimation of the grounding network.

Description

technical field [0001] The invention relates to the corrosion diagnosis of the grounding grid and the industrial application of biological EIT technology, and mainly relates to the establishment of the corrosion diagnosis model, the finite element calculation of the forward problem, the regularization of the ill-conditioned nonlinear inverse problem and its iterative numerical calculation. Background technique [0002] The grounding grid is an important equipment in the power system, and its good voltage equalization and discharge capacity is the guarantee for the safe and stable operation of the power system. The grounding grid in our country is mostly welded with flat steel. Since the power system works in a humid underground environment for many years, it is easy to be corroded. The severely corroded grounding grid is prone to branch breakage under the impact of high current, which affects its grounding performance and threatens the safety and stability of the power syste...

AI Technical Summary

Problems solved by technology

The initial grounding grid diagnosis method is mainly based on experience and selective excavation. This method requires a lot of manpower and material resources, and there is a large blindness, which makes it difficult to achieve effective diagnosis of the grounding grid.

After a lot of research, the current grounding grid diagnosis methods mainly include methods based on electrical network theory, electromagnetic field theory and electrochemical theory, but the corresponding methods have reached technical bottlenecks due to the complexity of the actual substation grounding grid and the surrounding environment. The corrosion diagnosis of the ground grid cannot be effectively carried out

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