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Creepage discharge propagation in air and SF6 gas influenced by surface charge on solid dielectrics

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4 Author(s)
Okubo, H. ; Dept. of Electr. Eng., Nagoya Univ., Japan ; Kanegami, M. ; Hikita, M. ; Kito, Y.

Influence of surface charging on creepage discharge propagation in air and SF6 gas was investigated. The authors have employed a surface charging system using corona discharges, which permitted the deposition of surface charge on solid dielectrics with a given density distribution. By applying a lightning impulse across the charged surface of polyester film, they measured the discharge extension length as a function of surface potential generated by the surface charge. It was found that the impulse creepage discharges along the charged surface under a potential of 2 to 3 kV, extended a distance which was maximum 6× longer than the case of the uncharged surface both in air and SF6 gas. Experimental results were also discussed from the viewpoint of the specific capacitance, permitting their application to actual HV apparatus such as GIS

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Dielectrics and Electrical Insulation, IEEE Transactions on  (Volume:1 ,  Issue: 2 )