Electric Field Analysis and Electrical Insulation Performance for a Solid Insulator in HVDC Gas Insulated Switchgear

In this paper, using the Finite Element Method (FEM) analysis, electric field distributions were calculated and investigated for SF6 gas and epoxy solid insulator configurations in GIS for both AC/Impulse and HVDC conditions, under different material properties and different operating conditions, etc. The calculated results were discussed from the electrical insulation design of HVDC-GIS. The critical conditions on electrical insulation performance are discussed as functions of the spacer inclination angle, permittivity and conductivity ratios of the materials, thickness of the spacer, and so on. Moreover, the differences in the field distributions and the critical electric field locations between AC/Impulse and HVDC conditions, were quantitatively investigated. Finally, the optimum shape…