Influence of inert materials on the pollution flashover voltage of porcelain insulators

Presented in this paper is a computational model that handles both the soluble and the non-soluble components of the contamination for predicting flashover voltage. For this purpose a dynamic model previously developed for Equivalent Salt Deposit Density (ESDD) has been extended to include Non-Soluble Deposit Density (NSDD). The model is capable of handling AC as well as DC applied voltage for porcelain insulators. The model predictions have been checked using published experimental data for several insulator shapes, and good correlation has been established. Use of surface resistance as an alternative indicator of contamination performance has also been explored