Lightning current analysis for tall tower strike using 3D FEM

Abstract

In this study, the lightning current waveforms at the middle and bottom positions for 60 m tall tower strikes were observed using the three-dimensional finite element method (3D-FEM). When creating the model for lightning current waveform analysis at the middle and bottom positions of towers, base current speed and ground conductivity characteristics were taken into account. The model was developed using scattering boundary conditions to avoid wave reflections and limit computation time. We have considered ground conductivity of 5.98 e7 S/m, 0.1 S/m, and 0.01 S/m, respectively, in our model. Base current speeds were considered in our model to be equal to the velocity of light, half of the velocity of light, and one-third of the velocity of light, respectively. This investigation will aid in developing a lightning protection strategy and a better understanding of the properties of lightning.