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Wetting of a pollution layer by mist or light rain is inhibited, in the case of silicone rubber (SiR) insulators, by the migration of hydrophobic polymeric chains from the insulator to the layer surface. However, recent laboratory fog-chamber tests have shown that a salt/kaolin layer applied to the surface of an 11kV SiR insulator can reduce the specific creepage distance (SCD) at flashover to as...
In this work, the electric discharges activity on non-uniformly polluted glass plane insulator model is investigated for increasing applied voltage levels up to flashover. The effect of pollution severity was simulated using pollution solution containing various kaolin concentrations. The polluted sample has a strip that is dry and clean which is parallel to the electrodes planes. Configurations with...
The shank region of polluted polymeric insulators is susceptible to thermal damage where high current density and high electric field magnitude occurs. The recently proposed textured design consisting of hemispherical protuberances, aims to reduce the current density and the electric field gradient and increase the longitudinal creepage length without increasing the overall length of the insulator...
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