Corona inception under switching surge for point-to-plane long gaps

Abstract
This paper describes a method of calculating the corona‐inception voltage and its statistical probability for a point‐to‐plane long gap and under a switching surge of positive polarity. The minimum corona‐inception voltage is determined by calculating the number of electrons at the head of the primary avalanche. The statistical probability of corona inception is determined by calculating the critical volumes (or areas) in space at different voltages above the minimum corona‐inception voltage. The derivative of the critical volume (or area) with respect to time gives a measure of the statistical probability of corona‐inception voltage.

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