Effects of Voltage Type and Polarity on Flashover Performances at Low Atmospheric Pressure on an Ice Surface

摘要

The effects of voltage type and polarity as well as the conductivity of freezing water on the critical flashover voltage of a triangular ice sample were examined under different air pressure simulating to high altitudes. The results obtained show that the effect of voltage polarity on the minimum flashover voltage is more obvious at sea level than at high altitudes. The results reported in the present study will help to understand the effects of high altitude on the critical flashover voltage of actual insulators employed on DC and AC transmission power lines under icing conditions.