Study of Tower Grounding Resistance Effected Back Flashover to 500 kV Transmission Line in Thailand by using ATP/EMTP

Authors: B. Marungsri, S. Boonpoke, A. Rawangpai, A. Oonsivilai, C. Kritayakornupong

Abstract:

This study describes analysis of tower grounding resistance effected the back flashover voltage across insulator string in a transmission system. This paper studies the 500 kV transmission lines from Mae Moh, Lampang to Nong Chok, Bangkok, Thailand, which is double circuit in the same steel tower with two overhead ground wires. The factor of this study includes magnitude of lightning stroke, and front time of lightning stroke. Steel tower uses multistory tower model. The assumption of studies based on the return stroke current ranged 1-200 kA, front time of lightning stroke between 1 μs to 3 μs. The simulations study the effect of varying tower grounding resistance that affect the lightning current. Simulation results are analyzed lightning over voltage that causes back flashover at insulator strings. This study helps to know causes of problems of back flashover the transmission line system, and also be as a guideline solving the problem for 500 kV transmission line systems, as well.

Keywords: Tower grounding resistance, back flashover, multistory tower model, lightning stroke current.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1331189

References:

[1] K. Ngamsanroaj and W. Tayati, "An Analysis Of Switching Overvoltages in the EGAT 500 kV Transmission System", Large Engineering Systems Conference on Power Engineering, 7-9 May 2003, pp. 149 - 153.
[2] C. Y. Yu, N. Petcharaks and C. Panprommin, "The Statistical Calculation of Energization Overvoltages, Case of EGAT 500 kV Lines", IEEE Power Engineering Society Winter Meeting , Vol. 4, 23- 27 Jan. 2000, pp. 2705 - 2709.
[3] C. Jaipradidtham, " Electromagnetic Field Analysis on Surge Response of 500 kV EHV Single Circuit Transmission Tower in Lightning Protection System using Neural Networks", Proc. of Int. Conf. on Control, Automation and System, KINTEX, Gyeonggi-Do, Korea, 2-5 June 2005.
[4] N. Petcharaks, C. Y. Yu and C. Panprommin, " A Study of Ferranti and Energization Overvoltages case of 500 kV Line in Thailand", 11th Int. Sym. on High Voltage Engineering, Vol. 1, Conf. Publ. No. 467, 1999, pp. 291-294.
[5] P. Yadee and S. Premrudeepreechacharn, "Analysis of Tower Footing Resistance Effected Back Flashover Across Insulator in a Transmission System", Proc. of Int. Conf. on Power Systems Transients (IPST-07) , Lyon, France, June 4-7, 2007.
[6] Report of flashover voltage in Northern Region Operation Division 1996-2003, EGAT, Thailand. (in Thai)
[7] A. R. Hileman, Insulation Coordination for Power Systems, Marcel Dekker, New York, USA, 1989.
[8] L. V. Bewley, Traveling Waves on Transmission Systems. Dover Publications, New York, N.Y., USA,1951.
[9] M. Ishii, T. Kawamura, T. Kouno, E. Ohsaki, K. Shiokawa, K. Murotani and T. Higuchi, "Multistory Transmission Tower Model for Lightning Surge Analysis", IEEE Trans. on Power Delivery, Vol. 6, No. 3, July 1991, pp. 1327 - 1335.
[10] T. Yamada, A. Mochizuki, J. Sawada, E. Zaima, T. Kawamura, A. Ametani, M. Ishii and S. Kato, "Experimental evaluation of a UHV tower model for lightning surge analysis", IEEE Trans. on Power Delivery, Vol. 10, No. 1, January 1995, pp. 393 - 402.
[11] A. Ametani, N. Nagaoka, T. Funabashi and N. Inoue, "Tower Structure Effect on a Back-Flashover Phase", Proc. of Int. Conf. on Power Systems Transients (IPST-05), Paper No. IPST05 - 190, Montreal, Canada, June 19-23, 2005.
[12] R. B. Anderson and A. J. Erikson, "Lightning Parameters for Engineering Applications", ELECTRA 69, March 1980, pp. 65 - 102.