Influence of Tank Inner Side Dielectric Coating on the Particle Behaviour and Flashover Voltage in SF₆ Gas Insulated System

In this work, the influence of wire type conducting particles on the insulation reliability of GIS has been systematically investigated when he epoxy resin based dielectric coating was made on the inner side of outer electrode. For this purpose, coaxial cylinder-type electrode was adopted in 362 ㎸ chamber and various sizes of Cu conducting particle were used under different gas pressures. In order to elucidate the coating effect on the gas insulation. different thickness of dielectric coating has been considered and then the lift-off voltage and flashover voltages have been measured. The results show that the dielectric coating has a remarkable influence by restraining the movement of article in GIS system, and thus GIS insulation reliability is noticeably improved.