The influence of applied voltage on the surface conductivity of atmospheric ice deposited on insulating surfaces

摘要

In the present paper, the effect of applied voltage on the conductivity of both the inner and outer surfaces of atmospheric ice accreted on an insulating surface was investigated. The results were compared with those obtained on a polluted insulating surface. During the development of the flashhover arc, an equivalent surface conductivity for an insulating surface covered with ice was defined. A linear relationship between the equivalent surface conductivity of ice and the conductivity of freezing water was established. The results obtained are helpful for characterizing and modeling flashover arcs on actual HV insulators covered with ice.