Influence of surface modification on vacuum flashover performance of insulators

Cross-link polystyrene insulators was fluoridized at different temperature，and the vacuum flashover properties was tested by impulse voltage with width of 0.5 s. The flashover voltage of cross-link polystyrene insulators was enhanced by 40%-60% after surface fluoridization at 50-60℃. Multilayer high gradient insulator with new structure was processed by incorporating conducting layers into the surface of insulator orderly, and the flashover voltage was enhanced by 40%-50%, compared with general insulator with the same material, while maintaining good mechanical and machining properties.