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- In this paper, insulations characteristics by temperature changes(+50∼-50[℃]) of SF6 gas in the experimental chamber were studied. From this result, at the low temperature, the breakdown voltage was increased with a drop of temperature and an increase of inner pressure in GIS. In addition the ability of insulation of liquid SF6 was higher than that of the highly pressurized SF6 gas. That is, with progress of low temperature, the main reason of breakdown was not liquefaction of SF6 but rapid decrease of inner pressure. This study will come in greatly handy for the insulation design of GIS in a hard cold region