The Phase Transition and the Surface Flashover Characteristics of $SF_6$

$SF_6$의 상전이에 따른 연면방전특성

In this paper, insulations characteristics by temperature changes($+10{\sim}-60[^{\circ}C]$) of $SF_6$ 9as 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 remaining 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 $SF_6$.