Presented in this paper is a computational model that handles boththe soluble and the non-soluble components of the contamination forpredicting flashover voltage. For this purpose a dynamic modelpreviously developed for Equivalent Salt Deposit Density (ESDD) has beenextended to include Non-Soluble Deposit Density (NSDD). The model iscapable of handling AC as well as DC applied voltage for porcelaininsulators. The model predictions have been checked using publishedexperimental data for several insulator shapes, and good correlation hasbeen established. Use of surface resistance as an alternative indicatorof contamination performance has also been explored
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