Desempenho de Linhas de Transmissão Considerando as Correlações Estatísticas de Descargas Atmosféricas e a Modelagem do Aterramento

Abstract

This study presents a computational analysis of the behavior of transmission lines under lightning strikes, adopting a deterministic approach. For this purpose, the lightning current was simulated with predefined increments, aiming to identify the minimum value capable of causing system disruption. The employed model uses Heidler sources, with the possibility of considering or disregarding the statistical correlations between the parameters of the first negative return strokes recorded at the Morro do Cachimbo Station. Through simulations, backflashover rates were obtained for the 138 kV transmission system considering grounding modeling and the consideration or not of statistical correlations between discharge parameters as sensitivity analysis factors. The results illustrate significant sensitivity, impacting backflashover rates in high percentages.