Characteristics of N₂/SF₆ mixture gas in creeping discharge developing in narrow gap with backside electrode

Abstract

SUMMARYThe flashover voltage with a backside electrode was found to be lower than that without the backside electrode. Under microsecond pulse voltage application, we describe the characteristics of a creeping discharge developed in the narrow gap with the backside electrode. Using a CCD camera and ultrahigh-speed camera, we observed the corona extension processes. The lowest flashover voltage was found to be obtained at positive polarity with a SF 6 content D = 3%. In the corona extension obtained using an ultrahigh-speed camera, peculiar differences were observed in the corona extension process. The corona extension increased, and rapid flashover was observed at D = 3%. Using a CCD camera, small coronas were detected from the backside electrode.

Inception corona discharge voltages in SF6-N2 gas mixtures at high gas pressure

“…Figure 4 illustrates the corona inception voltage as a function of the gas pressure for different concentrations of SF 6 in SF 6 -N 2 gas mixtures for negative and positive polarities. It can be seen that the positive onset voltages are relatively higher than those of the negative polarity as found by [7][8]. This can be attributed to the mechanism of generation of initiatory electrons.…”

Characteristics of creeping discharge developed in narrow gap on a filamentous backside electrode

“…Therefore, it is necessary to elucidate the characteristics of creeping discharges developing in narrow gaps, which can lead to malfunctions. Usually, creeping discharges are strongly affected by backside electrodes, so that the characteristics of creeping discharges developing in narrow gaps with a plane backing electrode have been investigated [10][11][12]; however, the creeping discharge characteristics of configurations with a filamentous electrode are not clear.…”