Optimization Design of GIL Three-Pillar Insulators Based on Geometric Shape and Surface Dielectric Distribution
In order to control the concentrated distribution of electric field on the surface of three-pillar insulators and inserts,a geometric-dielectric optimization method based on finite element model(FEM)combined with evolutionary algorithm(EA)is proposed.Firstly,geometric and surface dielectric parametric models of gas insulated line(GIL)three-pillar insulators are established.The maximum tangential field strength of insulator surface Et-max,the non-uniform coefficient of tangential field strength Ft,and the maximum normal field strength of insert surface Ei-max are taken as optimization targets,and geometric-dielectric optimiza-tion calculation is carried out by cyclic FEM with evolutionary algorithm.Compared with the results before optimization,Et-max decreases from 11.3 kV/mm to 9.47 kV/mm,Ft decreases from 1.56 to 1.34,and Ei-max decreases from 31.9 kV/mm to 13.4 kV/mm.The geometric structure of the optimized three-pillar insulator has the characteristics of dumbbell type,the distance along the surface is increased,the overall profile is a circular arc with greater curvature,and the surface dielectric gradient after optimization is distributed in a"scoop curve".The results of optimization design can provide reference for the subsequent manufacture of three-pillar insulators,and the technical route of this paper can also be used for the optimization of other insulation parts.
GILthree-pillar insulatornon-uniform dielectric coatinggeometric optimizationelectric field distribution
万方数据
维普
