온도저하에 따른 $SF_6$의 연면파괴특성

The Surface Flashover Characteristics of $SF_6$ with a variation of Temperature

In this paper, insulations characteristics by temperature changes(+30~-40[$^{\circ}C$]) of $SF_6$ gas in the experimental chamber were studied. From this result, The breakdown characteristics classify the gas & liquid coexisted stage of voltage value increases & much deviation and the $V_B$ low stage as the interior of chamber gets filled with mixture of $SF_6$ that are not liquefacted and remain ing air which couldn't be ventilated. In addition the ability of insulation of liquid $SF_6$ was higher than that of the highly pressurized $SF_6$ gas. In this research, we want to provide the base data on designing insulation of high-temperature superconductor and the cryogenic equipments by investigating the insulation characteristics of $SF_6$.