Research on the Gradient Control Method of Electric Field Strength for Environmentally Friendly GIS Basin Insulators

With the promotion of the dual carbon goal, the green and low-carbon transformation of the power system is imperative, and the replacement of fluorine containing switchgear is urgent. Green and environmentally friendly switchgear has become an urgent need for the construction of new power systems. This article establishes an electric-thermal-current multi field coupling simulation model for the accumulation of surface charges on insulators. A method for constructing composite gradient interface insulation of basin insulators is proposed by comparing the surface electric field distribution patterns and surface charge accumulation characteristics of insulators with different structures. The focus of geometric structure optimization is to achieve the reduction of surface normal electric field components and the suppression of surface charge accumulation. Reasonably optimizing the surface contour curve of insulators can simultaneously improve the tangential and normal electric field distribution of insulators, using particle swarm intelligence optimization algorithm. After optimization, the maximum field strength on the convex side of the spacer surface decreased to 3.27 kV/mm, and the maximum field strength on the concave side decreased to 3.67 kV/ mm.