Abstract
Charge accumulation on the insulator surface is one of the critical factors for the development of DC gas-insulated equipment since it will lead to the overstress of solid insulation due to local field distortion and enhancement. In this chapter, the measurement, characteristics, and suppression methods of surface charge were investigated. For the measurement, Kelvin probe method was used to detect the surface potential distribution of a cone-shaped insulator in a downsized gas-insulated line (GIL) and the inverse calculation algorithm of surface charge was introduced. Based on this method, the charge accumulation characteristics of an epoxy insulator under DC voltage in air and SF6 was studied. The results show that there are two patterns in the charge distribution: dominant uniform charging and random charge speckles. The mechanism of these two patterns were discussed and verified by experiments. Finally, two material modification methods to suppress surface charge accumulation were proposed. One is fullerene-doping, for the purpose of reducing the bulk conductivity of insulators to decrease the bulk current in the solid and thus suppress the uniform charging. Another is nano-laminar coating, to promote charge dissipation rate and thus reduce charge speckles.
Published Version
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