Estimation of Sparkover Rate of a Medium-voltage Line with Negative Lightning Current Parameters Obtained based on Observed Electromagnetic Fields

Abstract

The authors evaluate the sparkover rate of a medium-voltage line associated with direct strokes to the line by using peak currents obtained at southern Kyusyu by the JLDN (Japan Lightning Detection Network). In the evaluation, the correlation between the front duration and the peak currents is taken into account as well as the low-voltage line often installed below. As the result, the estimated sparkover rate for a flash is in reasonable agreement with the reported rate.