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Jaimis S. L. Colqui
School of Electrical and Computer Engineering, State University of Campinas
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Rodolfo A. R. Moura
Electrical Engineering Department, Federal University of São João del-Rei
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Marco Aurélio O. Schroeder
Electrical Engineering Department, Federal University of São João del-Rei
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José Pissolato Filho
School of Electrical and Computer Engineering, State University of Campinas
Keywords:
Transmission line modeling, surge arresters, lightning protection, frequency dependent behaviour, grounding, time-domain simulations
Abstract
This paper investigates the influence of considering the performance of different calculation of transmission line parameters on the lightning performance of line surge arresters. The lightning performance of a surge arrester installed in a typical Brazilian 138-kV transmission line is assessed, while transmission line parameters are calculated in 3 different ways namely: i) Carson formulation, ii) Nakagawa formulation considering the electrical parameters of the ground constant with the frequency, and iii) Nakagawa formulation considering the frequency- dependent characteristics of soil. Taking as reference the results determined using the Carson formulation, it is shown that the Nakagawa formulation constant and dependent with the frequency can lead to possible incorrect prevision of insulation failure in lines partially protected by lightning surge arresters. According to the results, depending on the case, maximum differences of 6.01% and 6.42% can be found, respectively.
