Investigating the effect of lightning channel inclination on the induced voltage in overhead lines in the presence of horizontally stratified ground

Abstract

The present paper explores the impact of inclined lightning on the induced voltage on an overhead line in the presence of two-layer horizontal stratified ground. The Finite Element Method (FEM) is utilized to solve the full-wave Maxwell equation and evaluation the induced voltage. The impact of thickness of the top soil layer, upper soil conductivity, and return stroke current waveform on the peak of the transient induced voltage, induced voltage waveform, and profile of the transient voltage along the line is studied. The peak of induced voltage and waveform is remarkably influenced by the angle of the channel, soil structure, and upper soil thickness and conductivity. The results shown where the upper soil layer is less conductive than lower soil, the upper soil layer thickness is an important parameter that influenced the voltage peak. Also, the transient induced voltage peak in the presence of two-layer stratified ground is significantly affected by the lightning return stroke current. When the lightning current has a faster rising and settling time, it could be concluded that channel inclination has a greater influence on the induced voltage in the presence of two horizontal stratified layers.