Análise de curvas de corrente de relâmpagos em torres

Abstract

This dissertation makes a morphological and statistical analyses of return stroke current waveforms of positive and negative, downward and upward lightning from some of most important towers located in the Switzerland, Japan, South Africa and Brazil. In part, the data utilized in this report were compiled from relevant literature. On the other hand, the most important data are originally acquired from the ""Morro do Cachimbo Station"" located in Minas Gerais - Brazil a lightning research station built for CEMIG at 1985. Our results indicate a new type of positive lightning with different properties, including its normally higher intensity. Our results also allowed confirming some tendencies with respect to the behavior of lightning in low latitudes, as larger amplitude of the return strokes, larger multiplicity and characteristic times