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The introduced defects such as gas void, surface bulge or depression, conductive particles will exacerbate the distortion of electric field and may lead to insulation failure of GIS equipment. In this paper, by using finite element method, the 3D computation model of UHV GIS basin insulator that contains several kinds of typical defects has been established. The influence of interface void, surface bulge or depression and conductive particles on the electric field distribution of UHV GIS basin insulator has been investigated, respectively. The length and thickness of the gas void have a significant effect on the electric field distribution of the interface. The maximum E-field strength increases first and then decreases when the diameter varies from 0.1 mm to 2 mm. The attached conductive particle has significant influence on the surface electric field distribution of basin insulator, while the suspended conductive particle has much smaller effect.
Inspec keywords: electric fields; finite element analysis
Subjects: Steady-state electromagnetic fields; electromagnetic induction; Numerical approximation and analysis