Abstract
The effect of barrier between a needle electrode and plane one in (N2/SF6)gas mixture on creeping flashover was investigated using a μs pulse voltage. The content of SF6 gas was varied from 0 to 100%, and gas pressurre was varied from 0.1 to 0.3MPa. The flashover voltage increased with increasing the content of SF6 for a positive needle electrode. For a negative needle electrode, excepting the total pressure 0.1MPa in which similar flashover characteristics was obtained as positive one, considerable decrease in flashover voltage was found in the case of the mixture of a few percentage of SF6 in (N2/SF6) gas mixture at elevated total pressures. The corona behavior on the barrier in (N2/SF6) gas mixture was investigated utilizing an ultrahigh-speed digital framing camera.
