Discussions on Lightning Discharge Parameters on Transmission Line by Altitude Triggered Lightning in Winter Thunderstorm

Abstract

This paper presents the altitude triggered lightning to a test EHV transmission line in winter thund erstorm. The inducing wire was isolated with a nylon line from the ground up to the altitude of 70m to 160m. Thirty one striking events have taken place on the several locations of the transmission line. Current wave forms were measured and the corresponding lightning discharge channels were well reconstructed by an acoustic analyzing method. The characteristics of striking distance vs. peak current, and the histogram of vertical striking angle were investigated and discussed from the view point of lightning striking parameter to a transmission line.