Пути оптимизации внутреннего электрического поля проходных полимерных изоляторов

Abstract

The main reason of bushings polymeric insulator’s class 35 kV failure is aging caused by the high electric field. Based on the results of analytical studies and numerical solutions of the Laplace equation for the complex conductivity substantiated recommendations on alignment of the electric field of the insulator. The optimal ratios are formulated of the basic design parameters of the insulator with the characteristics of the used dielectric materials. Quantitative assessment of the edge effect of the grounded flange and ways that practically reduce this effect were given: radius increase of rounding of the edges of the flange and application of weakly conductive coating on a limited area of the outer surface of the support tube. It is recommended for the basic isolation to utillize liquid silicon rubber, that provides the best pressurizing of insulator.