Abstract

The lightning is a natural phenomenon, unforeseeable and behaves as a perfect generator of the electrical current which can reach the two hundred Ampere kilos and then it is a problem classified like a serious wonder for the researchers. The induced transient over-voltages in the electric systems following electromagnetic radiations of the lightning represent the most severe constraint and most significant on the electrical power networks. In this paper we present an lightning analysis in the capacity as a transient source of surge current following model MTLE chosen among others, then an original contribution which defines an analytical model of the electromagnetic field radiated by the lightning for a particular situation and which gave satisfactory results by simulation compared with experimental measurements that we carried out us even at the laboratory of high voltage in EPFL in Switzerland and also of the other authors like G Berger, M.Uman and Rakov in Florid. A computation of the induced overvoltages in overhead electric lines on the basis of electromagnetic coupling model of Taylor interpreted the limit of our work in this paper