Research on Corrosion Detection Method of Tower Grounding Body Based on Transient Electromagnetic Method

The grounding body of the transmission tower is of great significance to the safe operation of the power system, its corrosion state needs to be accurately detected to ensure a safe discharge channel for lightning current. In this paper, transient electromagnetic method is employed to detect the corrosion of tower grounding body. Based on the distribution characteristics of magnetic induction intensity, the location of grounding conductor with corrosion or breakpoint can be accurately located. The model of tower grounding body is established by COMSOL multiphasic software, and the influence of different corrosion degree, conductor material and soil resistivity on magnetic induction intensity is analyzed in detail. Field experiments are carried out to verify the effectiveness of the method.