Study of Characteristics of AC Arc Discharges on Polluted Insulator Surfaces

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Abstract
To elucidate the mechanism of pollution flashovers, the discharge characteristics of an arc were investigated by the authors in the following two cases. In the first case, the arc voltages were measured with flat plate insulators. It was found that if the length of the polluted portion is about 50% of the total gap length, the arc voltage when there is a portion free from the pollution between the electrodes is nearly equal to the voltage when the gap between the electrodes is polluted uniformly. In the second case, the arc discharge characteristics on the skirt surfaces of outdoor insulators were investigated, and it was found that the arc route at flashovers is such that the length of the arc discharges along the insulator surfaces is nearly equal to the length between skirt spacings bridged-over by the arcs.

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