Surface charge decay characteristics of epoxy spacer under space charge accumulation

Abstract Under DC voltage, space charge inevitably accumulates within the spacer, thereby influencing the dissipation of surface charges. In this study, a charge measurement platform for epoxy resin spacers is constructed. The temporal variation of the surface charge distribution under space charges is compared. The results indicate that homopolar space charges enhance the surface charge dissipation. This is because about 95% of the total dissipation charge depends on the recombination of surface charges with heteropolar charged particles in the air. The homopolar space charge inside the spacer augments the normal electric field intensity in the gas side, facilitating the surface charge dissipation. It is inferred that the effect of the space charge inside the spacer should be considered when measuring the surface charge after disconnecting the operation voltage. This study provides important theoretical support for revealing the decay characteristic of surface charge on the spacer.