Construction and Analysis of Influencing Factors for Induced Apparent Magnetic Impedance

The assessment of the health status of the substation grounding network is of great significance for ensuring the safety of personnel and equipment inside the station. To achieve nondestructive testing of grounding grids, a detection principle based on Induced Apparent Magnetic Impedance (IAMI) was proposed, and a IAMI model was established. The variation law of IAMI detected on the ground under different working conditions was studied, and it was found that the phase and amplitude of IAMI had extreme values when the detection position was directly above the underground conductor, laying a theoretical foundation for non-destructive testing of grounding grids.