The Impact of Transmission Line and Grounding System Modeling on Special Lightning Protection Systems

Jaimis S. L. Colqui; Rodolfo A. R. Moura; Marco Aurélio O. Schroeder; José Pissolato Filho

doi:10.20906/sbse.v2i1.2918

Jaimis S. L. Colqui School of Electrical and Computer Engineering, State University of Campinas
Rodolfo A. R. Moura Electrical Engineering Department, Federal University of S˜ao Jo˜ao del-Rei
Marco Aurélio O. Schroeder Electrical Engineering Department, Federal University of S˜ao Jo˜ao del-Rei
José Pissolato Filho School of Electrical and Computer Engineering, State University of Campinas

DOI: https://doi.org/10.20906/sbse.v2i1.2918

Keywords: Lightning protection, transmission line modeling, underbuilt wire, grounding

Abstract

This paper aims to assesses the performance of different models of transmission lines and grounding systems when using the underbuilt-wire protection technique against lightning overvoltages. Moreover, the frequency dependence of the soil parameters is also investigated. A first stroke representative waveform of lightning current is considered and the simulations took place in the Alternative Transients Program (ATP). It was found that simplified models of transmission lines and grounding systems that consider constant frequency electrical ground parameters result in inaccurate responses of overvoltages in the insulator strings. According to the results, depending on the case, maximum differences of 20.23% can be found.