Measurements of Current Associated with Negative Downward Lightning Flash on Summer

Abstract

The authors have carried out measurement of the current waveforms associated with lightning strokes to wind turbines at south Kyushu. In this paper measured waveforms on summer in 2013 are reported and it is shown that the return strokes with steep rate of rise and/or with high energy are observed in summer. This result is of practical importance for the insulation design of the wind turbine at the area of high lightning activity on summer.