Abstract: The horizontal and vertical electric fields due to nearby lightning are calculated adopting the transmission line model. And lightning-induced voltages on an overhead line are evaluated by using the coupling model proposed by Agrawal et al. Finite difference time domain method is adopted in calculation of both fields and lightning-induced voltages. The distribution rule of lightning-induced voltage on an overhead line is obtained.

Key words: lightning electromagnetic pulse, finite difference time domain （FDTD）, overhead line