Computation of Electromagnetic Fields Around Transmission Line Due to Lightning Strokes

摘要

In this paper, a new method tor the calculation of electromagnetic fields around a transmission line subjected to a lightning strike is described and discussed. The electric fields and magnetic fields are presented graphically as a function of spatial coordinate, as a function of time and as a function of both. It is believed that this exact solution have not been published before. First, a double exponential lightning surge current is injected into a transmission line. Once The temporal variations of current is known, then electric and magnetic fields can be calculated by using the field expressions for electric dipolcs over infinitely conducting ground. As the calculation was done for each frequency, temporal and spatial distribution of the electromagnetic fields are obtained by an inverse Fourier transformation of all these responses.