Studies on the influence of corona on overvoltage surges by simulation using the ATP/EMTP

Electrical systems are subjected to constraints more severe continuation with overvoltage´s which can be due to lightning and switching strikes. Under the influence of the intense corona effect which accompanies of atmospheric overvoltage, these overvoltages undergo deformations at the same time as an attenuation of their amplitude, this phenomenon of distortion, which is superimposed on the distortion by skin effect, is due to the dissipation of energy by injection of space charges around the conductor, this process with place as soon as the instantaneous voltage exceeds the threshold voltage of the corona effect conductors. In this paper, an analogical model of the corona effect has been implemented in the Alternative Transients Program/ Electromagnetic Transients Program (ATP/EMTP). This model was incorporated into a transmission lines, the line is divided on a number of the short sections. This study is to have the attenuation and the distortion of the overvoltage waves due to the corona effect on this transmission line.