Damping model of travelling waves by corona effect along extra high voltage three phase lines

The paper describes a corona effect model which takes the variation in the coupling coefficients of three-phase power transmission lines into account during the propagation of a lightning wave. As the corona is often modelled by capacitances between phase to earth, the aim was to take also into account the corona effect between conductors, to evaluate precisely all the losses due to this phenomenon. The propagation of a lightning wave is simulated with EMTP, taking the skin effect and the corona effect into account. Simulation results are compared with tests performed on a real 220 kV line. It can be noticed that the incident lightning wave and induced waves are highly influenced by the skin effect and the corona effect. The results from the proposed model are very close to the values recorded during the tests