Three-Phase Overvoltage Induced on Overhead Distribution Line 40 m from Rocket-Triggered Lightning

This article analyzes the three-phase lightning-induced voltages (LIVs)waveform on a 1513 m long overhead distribution line 40 m from rocket-triggered lightning, and the corresponding current and electric field data are given. The return stroke peak current ranges from 5.7 kA to 36.5 kA. The arithmetic mean(AM) and geometric mean(GM) of the return stroke current amplitude are 14.7 kA and 13.5 kA respectively. The peak-to-peak value range of the electric field waveform is 21.7 kV/m-130.9 kV/m. The observed electric field and voltage waveforms have similar waveform features. Among 35 LIVs, the peak-to-peak value range from 17.1 kV to 103.7 kV, and the negative peak value range from 2.3 kV to 16.7 kV. For these two parameters, the amplitude sequence is phase A > phase B > phase C. The positive peak value of the LIV is greater than the negative peak value, and the average reverse peak value ratio of the induced waveform is 345.6%. Besides, the results show that the negative peak, peak-to-peak, and half peak width time of the LIV have a good linear correlation with the corresponding electric field parameters.