Leakage current and performance of silicone rubber insulators during salt-storms

The leakage current and the performance of silicone rubber insulators during a salt-storm were studied at the Anneberg research station. A relative comparison of leakage current data was made for insulators with leakage distance in accordance with valid specifications and for insulators with shorter leakage distance i.e. higher electric stress. The data show that a high voltage AC or DC insulator, with silicone rubber surface and leakage distance in accordance with valid specifications, maintains low leakage currents under severe salt-storm conditions experienced on the Swedish west coast. However, a silicone rubber insulator with a much shorter leakage distance may show high leakage currents