Study of lightning overvoltage transients using ATP

Rapid development of transmission and distribution network requires an in-depth research and development work for their proper operation. Protection of the components used in transmission and distribution substations is one of the most important factors which must be taken care of in a very efficient manner. In this paper the analysis of lightning over voltage is performed at a 400 kV AIS (Air Insulated Switch gear) substation, a detailed research work is done for the selection of the main initial condition of lightning surge and the model of the substation devices are also analyzed. Electromagnetic transient program (EMTP-ATP) software is used for the analysis of lightning effects of the developed 400 kV AIS substation. The results which are obtained after the simulations are analyzed thoroughly and from those obtained results the influencing factors of the lightning surge amplitudes are studied and accordingly measures are introduced.