Pollution flashover is the major problem for operation of distribution network in IRAN, particularly in region close to Persian Gulf and Oman Sea. Conventional methods for measuring site pollution severities have formed the subject of many studies Iran's location in middle east with its various climate including little rain, frequent sand storm, condensation phenomena and dew resulting from large temperature fluctuations between day & night, sea contamination resources like Persian Gulf, Oman sea, as well as industrial contamination resource worsen the situation for T&D system. Therefore, site pollution severity measurement is very worthwhile to choose the appropriate insulation, maintenance period and overcoming insulator failures. The traditional method of site pollution severity determination is ESDD that present useful issues with NSDD. For the first time in IRAN, thirty test stations were installed in Khoozestan. In this paper field tests results of ESDD, NSDD presented and a new appropriate pollution criterion based on ESDD NSDD was obtained. This basis is then used to obtain a simplified procedure to determine the minimum insulator flashover characteristic that will provide an adequate flashover performance and through the research we could get maintenance strategy for our distribution network.
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