Comparison of Insulator Types by the Wet Contaminant and Clean Fog Test Methods

Withstand and flashover test data are presented for five types of insulators tested by the clean fog method and the wet contaminant method. The insulators were contaminated with a slurry having the proportions of 1 liter of water, 20 grams of Cab-O- Sil, 1 gram of Photo-Flo, and various quantities of salt to obtain the desired conductivities. The present data are also compared with those obtained by other investigators.