Research on Charge Variation of Discharges in Pure Nitrogen and its Mixture with Sulfur Hexafluoride

Nitrogen and its mixtures with sulfur hexafluoride are receiving more attention as insulation gases. In this paper, the surface charge variation of the discharges in pure Nitrogen and its mixture with sulfur hexafluoride was measured by the Pockels effect. The experiment result shows that, in a lower gas pressure, the surface charge channel will propagate further and the branches are less likely to occur. The surface charge channels in the mixture hardly extend outwards which may be due to the electronegative of sulfur hexafluoride.