Discharge Phenomena in SF₆ and SF₆-Air Mixture Gas under Impulse Voltage

Abstract

The discharge phenomena in pure SF₆ and SF₆-air mixture gas are observed by electrical and optical technics. Current and light pulses accompanied with the corona discharge in pure SF₆ gas have very low peak values and a short duration time compared with those in air. The velocity of the corona development in pure SF₆ gas is about 10⁷cm/s, and is almost the same as that of the leader in air. When the SF₆ density in SF₆-air mixture gas is high, the discharge channel becomes fine and short. The space charge production of l～60 nC is observed for the occurrence of the corona in SF₆-air mixture gas.