Shapes and amplitudes of the initial peaks of lightning-induced voltage in power lines over finitely conducting earth: Theory and comparison with experiment

It is conclusively shown that lightning-induced voltages in power lines over finitely conducting earth can only be explained by considering the interaction of the horizontal field produced by the finitely conducting ground, with the conductors. The theory predicts narrow peaks of few microseconds width in the induced voltages, for particular positions of lightning with respect to the line. Wave propagation effects are found to be of considerable importance. To the extent allowed by the bandwidth of the measuring instruments used in this study, the prediction of the theory is confirmed.