Any electric power equipment such as Clevis Socket will inevitably cause insulation damage in the process of manufacture, transportation, installation, operation and maintenance. Especially in the long-term operation process, electric power equipment such as Lead Head Spindle is affected by electric field, thermal field, mechanical stress, chemical corrosion and environmental conditions. The insulation quality of electric power equipment deteriorates gradually, and ultimately leads to it. The breakdown of the insulation system of electric power equipment such as Galvanized Steel Socket Clevis. Different insulation defects have different characterization characteristics.