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Research on Fault Diagnosis Method of Multi-station Fusion Grounding Network

To address the safety of grounding network in the operation and maintenance phase after the completion of multi-station fusion, this paper models and simulates the impact characteristics of the grounding network in normal, corroded and fractured states. When the conductor near the lightning injection point of the grounding network corrodes, the ground surface potential difference increases near the corroded conductor, but the other parts do not change much; when the conductor near the lightning injection point of the grounding network breaks, the ground surface potential at the injection point increases significantly, and there is a large potential difference in the ground surface potential distribution of the whole grounding network. A fault diagnosis method based on the ground surface potential and magnetic field distribution is proposed. The fault diagnosis of the grounding network is performed by adding heterodyne excitation currents to the grounding network and detecting the potential and magnetic field distributions generated at the ground surface. Corrosion and fracture can be accurately detected and accurately located in the detection area formed by the current injection and outflow points.