WSEAS Transactions on Power Systems
Print ISSN: 1790-5060, E-ISSN: 2224-350X
Volume 14, 2019
Analysis of Lightning Surge Phenomenon and Surge Arrester Performance of a 400kV Transmission System
Authors: Md. Salah Uddin Yusuf, Abdul Munem Saad, Monira Islam, Chowdhury Azimul Haque
Abstract: Lightning causes abrupt interruption in electrical power network. In this study a 400kV transmission system has been modelled to observe the influence of lightning surge current front time and tail time, back flashover phenomenon and performance of transmission line surge arresters. At first, induced voltage on the top of the tower has been observed for different front times and tail times of the same surge current function. A dynamic insulator flashover simulation model is also developed based on the voltage–time characteristics curve of the insulator string to observe the insulator flashover phenomenon. Effect of front time of the surge current on insulator flashover has been observed for the mentioned two different cases such as direct strike on the overhead ground wire and tower top of different surge currents and it has been found that insulator flashover phenomenon takes less time to occur for lower front times. Simulation results also show that although flashover occurred across the insulators placed on two horizontal ends of the transmission tower for lightning strike on the overhead ground wire and top of the tower, no flashover has occurred across the insulator placed on the horizontal midpoint of the tower. To implement transmission line surge arresters IEEE, Pinceti and Farnandez-Diaz surge arrester models were compared and the one with the better accuracy has been applied to observe the effectiveness of surge arresters against lightning surges. Three different cases containing different surge currents such as direct strike on the overhead ground wire, tower top and phase conductor have been taken into account for the surge arrester performance analysis. The induced overvoltage on the phase conductors with and without surge arresters has been analyzed for each cases using ATP Draw. In first two cases the induced voltage on the phase conductors are greater than the Basic Impulse Level (BIL). In case of direct strike on the phase, induced voltage is greater than BIL where the lightning strikes. Applying surge arresters has effectively reduced the induced voltage below the BIL thus preventing line outages in each case and it has been observed that for greater induced voltage arrester’s percentage overvoltage suppression becomes higher.
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Pages: 88-97
WSEAS Transactions on Power Systems, ISSN / E-ISSN: 1790-5060 / 2224-350X, Volume 14, 2019, Art. #11