Experimental and Analytical Studies of Factors Which Affect Flashover Voltage on Polluted Insulation Surfaces

This paper reports experimental data on parameters which affect the flashover voltages of a contaminated insulation surface in fog conditions. An attempt has been made to interrelate the effect of the wetting rate with the density of the inert binder and the effect of the density of the binder itself on the flashover yoltages, the subject on which previously reported experimental data are in contradiction. A theoretical model has been developed which predicts dry band growth and temperature distribution along dry bands. It has been found possible to relate the conclusions of the experimental study with those of this model.