Abstract
The Telegraphers' Equations for multiconductor lines are solved taking account of the vertical and the horizontal electric fields due to a nearby return stroke. Based on the Telegraphers' Equations, the correct equivalent circuits for calculation of overvoltages induced by the nearby return stroke are presented. The vertical and horizontal electric fields are calculated by decomposing the return stroke channel into numerous dipoles.
By means of this method, lightning-induced voltage waveforms on multiconductor power distribution lines over lossy ground are calculated with respect to the conductivity of ground. As a result, these calculated waveshapes are found to be in reasonably good agreement with the experiments over both perfectly and imperfectly conducting ground. It is concluded that the ground conductivity plays an important role on the lightning-induced voltages over poorly conductive ground.
