Influence and Optimization of Burrs of Different Shaped Insulators Near Electric Fields

In the manufacturing process of the basin insulator in gas insulated switchgear (GIS), there may be burr defects in the interior, and the burr defects will distort the electric field distribution nearby, the local electric field distortion will lead to partial discharge or breakdown fault. A 252 kV GIS basin insulator is taken as an example to analyze the influence of burr radius, burr length and burr tip angle on the electric field distribution around the insert and the influence of ring metal coating on the distorted electric field. The results show that the degree of electric field distortion around the burr decreases with the increase of the radius of the burr. The degree of electric field distortion at the tip of the burr increases with the increase of the length of the burr. The distortion degree of the electric field around the burr decreases with the increase of the burr tip angle. Ring metal coating has a certain subtractive effect on electric field near burr. The simulation results provides reference for GIS basin insulator burr defect field fault analysis and local optimization of insulator structure.