Analysis of Lightning-Induced Voltage on Power Distribution Line over Lossy Ground Taking

Account of Inclination of Lightning Channel

Abstract

The effect of the ground conductivity on the lightning-induced voltage on an overhead wire, associated with an in-clined return-stroke channel, is studied as well as the effect on the electric field. The induced voltage is calculated by the method where the tangential component of the electric field to the line is looked upon as inducing sources, and the electric field is calculated by decomposing the lightning channel into numerous dipoles. The effect of the ground conductivity on the horizontal electric field is found to be dependent on the direction to the striking point, and the effect on the lightning-induced voltage waveform turned out to be dependent on the three-dimensional configuration of the return-stroke channel relevant to the line.