© The Institution of Engineering and Technology
This study is aimed at the characterisation of surface discharges propagating over different solid materials namely glass, bakelite and epoxy resin immersed in three gases and their mixtures (namely SF6, N2 and CO2, SF6/N2 and SF6/CO2) under AC voltage (50 Hz) in a point-plane electrode system. It is shown that the stopping length of discharges (Lf ) increases linearly with the applied voltage and decreases when the gas pressure is increased. Lf is longer in CO2 and N2 than in SF6 [Lf (N2) > Lf (CO2) > Lf (SF6)]; and the increase of SF6 content in the investigated mixtures leads to a significant decrease of Lf . Also, for a given gas, Lf is slightly longer with glass and bakelite than that with epoxy resin indicating that the higher the dielectric constant, the longer the discharge is. Thus, the density of the discharge branches and Lf reduce when the thickness of insulators increases and/or their dielectric constant decreases. Such observations evidence the implication of capacitive charge effect and electric field in the development of creeping discharges.
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