Electric Field Analysis and Optimization of Embedded Pole Applied in 72.5 kV Gas Insulated Switchgear Cabinet

The insulation analysis and optimization of high voltage level embedded pole is of great significance to avoid the occurrence of surface discharge. In this paper, the finite element calculation method is used to obtain the electric field distribution of the 72.5kV embedded pole. It is found that the electric field intensity near the outlet end and the insulating rod is large, and insulation breakdown is easy to occur. Then, the electric field optimization of the embedded pole is carried out by improving the structure of the insulation shell at the outlet end and increasing the voltage equalization shield of the insulating rod. The optimized simulation results show that the electric field intensity decreases significantly. Finally, the withstand voltage experiment was carried out on the optimized embedded pole prototype, and no partial discharge phenomenon occurred, which proved the feasibility of the optimization scheme and provided a reference for the insulation design of embedded pole with similar structure.