Research on improving flashover resistance performance of insulators based on nonlinear conductivity

Abstract

This thesis establishes a numerical simulation model of a basin-type insulator using COMSOL Multiphysics software and investigates the influence of nonlinear conductivity on the electric distribution and flashover resistance. Three conductivity models are considered: a constant conductivity model, an electric field-dependent nonlinear conductivity model, and an optimized spatial conductivity distribution model. The electric field characteristics are evaluated based on the maximum electric field strength and electric field uniformity.

The results demonstrate that nonlinear conductivity can effectively suppress local electric field enhancement in insulators under DC conditions and improve their flashover resistance. This study provides a theoretical reference for the design of conductive gradient insulating materials and the development of more reliable high-voltage DC insulation systems.