Abstract
Abstract Substation insulators near coastal areas are rapidly polluted due to the salty wind blowing from seaside. Hazardous levels of pollution deposits cause higher leakage currents under damp conditions, resulting system blackouts and damages to substations due to flash-overs. This research is aimed at developing a method of reliable decision making to determine the time for washing polluted insulators to avert detrimental conditions. The proposed method consists of modelling the pollution deposits and to decide the time for washing the insulators by using the actual data of pollution deposits and weather information. Effectiveness of the proposed method is assured by applying it to the actual data at the Karatsu substation in Japan.
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