This paper describes the mechanism of creepage discharge propagation on charged dielectric surface in SF6 gas. Experimental results revealed that the surface charging having the opposite polarity to the applied impulse voltage increased the discharge extension length by enhancing the electric field strength at the discharge head. The charging potential of-12 kV for the 1 mm-thick PMMA sample doubled the mean step length and halved the pulse interval of stepwise discharge propagation. The influence of the charged surface on creepage discharge propagation was interpreted in terms of two processes: (a) streamer propagation and (b) streamer-to-leader transition based on the precursor mechanism.

No abstract

No abstract

No abstract

No abstract