Research on the Inverse Problem of Grounding Grid Fault Diagnosis Based on Inner-Source EIT
Li Xing1, Yang Fan1, Yu Xiao1, Dong Manling2, Yao Degui2
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China;; 2. He′nan Electric Power Corporation Research Institute Zhengzhou 450052 China;
Abstract：How to detect the corrosion defect in the branch of grounding grid is a urgent problem that the electric power department has been trying hard to solve. This paper proposed a method to image the resistivity distribution in grounding grid based on electrical impedance tomography, and applied it to the corrosion diagnosis of grounding grid. Firstly, the forward and inverse problem model were established according to the characteristics of the open boundary problem of the grounding grid. Then, a Newton-Raphson iterative method based on improved regularization was brought out to weaken the ill-posedness of the inverse problem. To reduce the impact of the large size and high contrast of resistivity between the soil and steel on the imaging quality, this paper proposed the methods of soil-separation and block-imaging, to improve the resolution of the image. Finally, the EIT diagnosis on the corrosion faults of the grounding grid is carried out through experiments. The experimental results can accurately locate the corrosion faults and verified the correctness of the method.
李星,杨帆,余晓,董曼玲,姚德贵. 基于内源式电阻抗成像的接地网缺陷诊断逆问题研究[J]. 电工技术学报, 2019, 34(5): 902-909.
Li Xing, Yang Fan, Yu Xiao, Dong Manling, Yao Degui. Research on the Inverse Problem of Grounding Grid Fault Diagnosis Based on Inner-Source EIT. Transactions of China Electrotechnical Society, 2019, 34(5): 902-909.
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2019, Vol. 34 
