Using Current Coefficient to Estimate DC Conductor Corona Onset Voltage

Corona onset voltage is an important parameter corresponding to corona characteristics. Existing onset voltage measurement methods can not distinguish the partial onset voltage and the onset voltage of transmission conductor. Based on analyzing corona onset and development process, a novel estimate method using current coefficient was presented to estimate DC onset voltage in this paper. The current coefficient method and other three methods were used to estimate corona onset voltage of smooth conductor and ACSR in four surface statuses.