Study on the Influence of Ice Weight on AC Flashover Performances of Natural Icing Insulators

At Xuefeng mountain test base, this paper carried out the icing flashover tests for insulators (4 types) with different pollution degrees and icing weights. The influence of salt deposit density (SDD), icing weight(W) and icing stress product (ISP) on AC icing flashover voltage of insulators is analyzed. The research result show that, 1) The flashover voltage decreases with the increase of SDD, and flashover voltage and SDD is a negative exponent power function; 2) Flashover voltage decreases gradually with the increase of W, and flashover voltage and W can well meet the exponential function relationship; 3) Both SDD and ice weight reduce the electrical strength of insulators, and SDD has little influence on the characteristic index m of W. The effects of SDD and W on the flashover voltage are independent of each other. That is, for iced insulators, ice can be considered as a special form of pollution; 4) The flashover voltage of long insulator strings is a power function with ISP. The flashover voltage decreases with the increase of ISP and finally tends to be saturated.