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In this paper, the static electrification phenomena on the dielectric materials by SF6 gas flow were investigated. When pure SF6 gas flows on the dielectric materials at high speed up to 25m/sec, no electrification was observed on the dielectric material surfaces. In case of the flow contained dielectric microscopic particles colliding with dielectric materials, it is confirmed that the SF6 gas flow of speeds above 5m/sec causes the electrification on the dielectric surfaces. The faster the SF6 gas flow, the higher the surface potential of the dielectric material is. Such phenomena of static electrification of SF6 gas contaminated with microscopic dielectric particles were explained to be caused by the friction between the dielectric materials and the dielectric microscopic particles in SF6. The polarity and the magnitude of the surface potential of the material, after flowing the SF6 gas contaminated with dielectric particles, are confirmed by the result of a general friction experiment of the two dielectric materials. It is considered that a well-controlled gas insulated transformer not contaminated with microscopic dielectric particles in SF6 can not generate electrification phenomena.

Static Electrificatiop Phenomena on Dielectric Materials of SF6 Gas Flow