Traveling Current Source Model for Lemp Calculation

In this paper a complete new lightning dis charge model is presented basing on gas dis charge physics. For LEMP calculation it is necessary to know the temporal and local current distribution along the lightning channel. The Traveling Current Source (TCS) model manages-to calculate the current distribution during the final jump period as well as during the return stroke period. The current is caused by the electric field during the final jump period and by collecting the corona charge carriers during the return stroke period. Therefore a current source is to be assumed traveling along lightning channel with a velotity smaller than light velocity. The TCS model is discussed in detail and compared with the transmission line model of UMAN today most used lightning discharge model. It is to be shown that LEMP measurements can be described in an improved way by using the TCS model.