Abstract: Aiming at the aging of partial insulation and partial discharge of wall bushing for switch cabinet bus, using the finite element analysis software Ansys, the partial electric field distribution was simulated and analyzed. The two structure optimization schemes were put forward, one of them is to increase the inner diameter of the insulation bushing properly, and the other is to reform the rectangular section of the bus into round corner shape. The simulation result shows that the optimized schemes can improve the electric field distribution in the air gap between the bus and the wall bushing and decrease the partial insulation aging of the wall bushing effectively.

Key words: switch cabinet, wall bushing, insulation aging, electric field distribution