Optimal Location of Surge Arrester for Protection of 220kV Transmission Line Against Lightning Over Voltages Using EMTP-RV Software
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Natural Lightning strikes are the main cause of over voltages in the power system. Such lightning over voltages can damage the system insulation if sufficient protections are not provided to the system. In the power system ground wire or shield wires are placed on top of the transmission line tower for the protection of transmission lines against lightning strikes. Surge arresters are also connected in the system for the protection against lightning strikes which protect the system by not allowing surge voltage beyond the permissible limit. Hence, study of lightning surges, location of surge arrester and its rating selection is very crucial parameters. For transmission system equipment lightning surge and switching surges have impact on its insulation system. For protection of the system against such over voltages, Surge Arresters (SA) are connected. In this paper study on overhead transmission line of 220 kV is taken under consideration. Analysis of lightning on 220 kV transmission line is performed and its effective ness are computed with different location of surge arrester and location of lightning strikes. Effect of tower footing resistance, Magnitude of surge voltage on primary side of transformer, transferred voltage on secondary winding is computed and presented in this paper. Further effect of surge with at various locations from the transformer with and without surge arrester is computed in EMTP-RV software and results are discussed in details. Modelling of lightning study is performed using EMTP-RV software.
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