In recent years

there have been multiple incidents of gas-solid interface discharge in ultra-high voltage epoxy resin impregnated paper dry-type bushings

which have attracted widespread attention. Analysis shows that the insulation failure of the gas-solid interface between the epoxy resin impregnated paper capacitor core and SF6 gas is one of the main causes of the accidents. Therefore

the gas-solid interface insulation of epoxy resin impregnated paper dry-type bushings has become a widely studied hotspot. This article explores the influences of temperature gradient

metal particles

surface roughness

and surface charge accumulation on surface flashover by combining the structure and operating conditions of epoxy resin impregnated paper dry-type bushings. Meanwhile

the physical process and mechanism of gas-solid interface flashover are analyzed

the main technical methods for improving the insulation performance of gas-solid interfaces are summarized

and the issues and future development trends of gas-solid interface insulation for epoxy resin impregnated paper dry-type bushings that need further research are discussed.