Effect of climatic variations on pollution deposit on electric insulation and related failure

According to DIN50019, the coastal districts of Persian Gulf are classified as extreme hygrothermal climatic zone. unusually high saturation vapor pressure up to 53mbar observed in this zone, justify this marking, as such air humidity phenomena are unique in the free atmosphere of the earth and are absolute extremes. intensive night falls of dew, which can occur regularly for several months, and long periods of rainless and sultry weather, worsening the situation for T & D system. Insulation design in these regions, due to lack of precision information of actual pollution degree, are based on approximate and experimental data, thus it is beneath the actual permissible limits in many polluted regions. Consequently, the insulation performances of those regions are inefficient and Number of fault records and washing intervals indicates improper design. Therefore, a field project established in association with Hormozgan T&D utility and Tavanir organization´s support to measure site pollution severity based on ESDD-NSDD methods in 20 test stations. In this paper, the procedures are presented.