Analysis of busbar-insulator mounted air gap electric field based on three-dimensional parametric modeling

Aiming at a certain type of switchgear in the lightning impulse test process insulator and busbar installation position abnormal discharge problem, this paper establishes a three-dimensional (3D) parametric model, the use of Ansys Maxwell electric field simulation software, calculation and analysis of busbar width (W), busbar thickness (T), busbar and insulator spacing (H) and screw specifications size and other parameters on the electric field characteristics of the impact and put forward to improve the program for experimental verification. The results show that: when the width of the busbar is larger than the insulator diameter (O), the electric field strength is maintained at a low level and should be given priority in the design; when the width of the busbar is smaller than the insulator diameter, the installation of circular insulating gaskets between the busbar and insulator can effectively reduce the electric field strength, the insulating gasket specification size R=40mm, H=3mm when the electric field strength of the air gap for the Eair=2.5E6 v/m, mounting bolt The electric field strength is Eair=2.6E6 v/m when the mounting bolts are replaced with hexagonal bolts of the same specification, and the improved scheme passes the lightning impulse test.