Effect of ambient temperature simulating different weather conditions has been investigated on insulators of different shapes. It has been observed that for a given salinity of contaminating solution, the amount of salt contained in the contaminated-surface layer is strongly temperature dependent. This is attributed to the viscosity-temperature characteristics of the electrolytic solution. dc flashover voltage of contaminated insulators reduces by about 0.7 ~ 1.0% per degree centigrade rise in temperature. dc arc V-𝒾 characteristics are, however, temperature independent in the investigated range. The observed temperature dependence of dc withstand voltag of contaminated insulators is attributed exclusively to the change of resiudal resistance and a good agreement holds between the measured and the estimated values. The influence of polarity on contamination withstand characteristics is independent of temperature variations in the investigated range.
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Ishii et al. (1984) studied this question.
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