The Response of a Transmission Line Illuminated by Lightning-Induced Electromagnetic Fields

This paper presents the theory and procedures used to estimate the voltages and currents induced on long transmission lines by cloud-to-cloud lightning. A model for cloud-to-cloud lightning phenomena is presented, and the theory necessary to calculate the electromagnetic fields created by the lightning stroke is derived. The time-domain transmission-line equations in the presence of external electromagnetic fields are presented. A time-domain formulation is more convenient if, in the future, nonlinear effects are to be included. The results of sample calculations, using finite-difference techniques for the solution of the transmission-line equations, are presented.