SF₆ 상태에 따른 절연파괴전압 비교분석에 관한 연구

In this paper the experiments of insulation characteristics by temperature change of SF? gas and insulation characteristics about liquid SF? in GIS(Gas Insulated Switchgear) were described. From this result, at low temperature, the breakdown voltage was increased with a drop of temperature and an increase of the inner pressure in GIS. The ability of insulation in liquid SF? was higher than that of the highly pressurized SF? gas. A liquid SF? discharge characteristics was caused by bubble formed evaporation of liquid SF? and bubble when high voltage apply to electrode. Corona was happened to weak bubble and was proceed to new bubble breakdown.