The effect of the lightning return stroke speed on voltages induced on nearby overhead lines

Abstract

In this paper the effect of lightning return stroke channel (RSC) speed, on induced voltages on a single overhead line is investigated. Simulations are performed using NEC-4 software. Three varieties of Antenna Theory (AT) model have been used: 1) simple AT model, in which the wave propagation speed along the RSC is the speed of light, 2) Fixed Inductance and Resistance (FLR) model where RSC speed is set to C/2, and 3) FLR model where RSC speed is set to C/3, using appropriate distributed inductances. The voltages induced on a transmission line by a lightning return strokes nearby the line, are compared together considering the above mentioned models, moreover the profile speed for different RSC wave propagations speeds are presented.