Experimental and mathematical modeling of the effect of non-soluble and low soluble salts and salts mixture pollution on dc flashover of high voltage insulators

摘要

This paper is aimed at the experimental study of the influence of non-soluble and low soluble salts and mixtures of salts on dc critical flashover voltage. The influence of the type of pollution on discharge parameters n and N, and their implication on the values of dc critical flashover voltage for both polarities is also analysed and discussed. A mathematical model enabling to compute the critical flashover voltage (Ucri) is proposed. It is shown that the calculated Ucri are in accordance with the experimental ones. It also appears from this study that: (i) the most important components of the discharge column are water vapour and air; and (ii) the transfer of metallic ions has not a significant influence on Ucri.