Transient electromagnetic hazard inside a lightning protection system

This paper deals with the evaluation of electromagnetic (EM) hazard in a lightning protection system (LPS), by taking into account coupling effects among aerial parts and earthed electrodes in order to improve the computation of the quantities which can determine hazards inside the LPS. A field approach is used; the computer code, entirely developed by the authors, is based on the numerical solution of the well-known thin-wire electric field integral equation in the frequency domain. Time profiles of electromagnetic quantities are evaluated via a fast Fourier transform. A suitable model to consider the lossy soil in a simplified way is proposed