Transient currents on lightning protection systems due to the indirect lightning effect

A general efficient method for analysing transient currents on lightning-control installations for protecting various structures (buildings) against lightning electromagnetic pulse (LEMP) effects is presented. The method is based upon the frequency-domain mixed-potential electric field integral equation formulation combined with the method of moments and the Fourier transform technique. Attention is focused on predicting the indirect effects of LEMP. The transmission-line representation of lightning return stroke, and the double exponential pulse model for the current at the channel base are employed in LEMP calculation. Several example problems are considered to illustrate the capability of the method. Some theoretical results are compared with experimental data obtained from measurements on the reduced-size models of lightning protection systems