AbstractOvervoltages of atmospheric origin which propagate along elpctrica! lines are attenuated and distorted by the corona effect and the skin effect. The attenuation is significant. We propose a mathematical line model taking into account skin effect in the conductors and the ground, and taking into account the corona effect. Simulation results are compared with Gary’s tests performed on a real 220 kV three phase line. It can be seen that the incident lightning wave and the induced wave are highly influenced by skin effect and corona effect. The proposed model is very close to the values recorded during the test.