Research on Typical Defects Electrical Performance of 1100 kV GIS Basin Insulator

In order to investigate the electric field distribution characteristics of 1100 kV UHV GIS basin insulator under defect condition, a typical defect model of basin insulator is established in this paper. The internal bubble defect and surface metal particle attachment defect of 1100 kV basin-type insulator were simulated. In the case that the basin-type insulator is attached with metal particle along the surface, the larger the radius of the metal particle is, the more serious the surface electric field distortion at the nearest point is. Meanwhile, the electric field distortion reaches the maximum in the condition of metal particle attachment from the middle to the end of the basin-type insulator. When the 1100 kV basin insulator has an internal bubble defect, except for the position near the central conductor, the core field strength of the bubble in most areas is 4.55 × 106 V/m, which is 1.7 times of the position without bubble defect. The larger the bubble radius inside the basin insulator, the more prominent the influence on the local field strength, and the field strength extreme value is distributed at the boundary between the bubble and the basin insulator material.