The electrical strength of vacuum insulation system is usually limited by the flashover phenomenon across the surface of insulator in vacuum.Multilayer high gradient insulator technology

a new insulator structure

is reported to perform higher breakdown electric field strength than conventional insulators.An investigation of this technology is presented

and an analysis from SEEA is explained.On the other hand

a model of small gap series and a simulation analysis are provided to account for the performance of improving insulator surface dielectric strength.