Wildfires are one of the main causes of transmission line outages in Brazil. However, not every wildfire will result in the outage of a transmission line. Understanding this phenomenon is fundamental to improve the quality of electric power supply. This work aims to identify the characteristics of spans of twelve 500 kV transmission lines that make them more susceptible to outages caused by wildfires. Based on the analysis of construction data, fire outbreaks, vegetation index, restrictions on the cleaning maintenance of the rights-of-way, weather conditions and terrain characteristics, the main characteristics that make a given transmission line span vulnerable to an outage caused by wildfires could be identified. The results show that spans located on land classified as savanna formations have a greater chance of leading to transmission line outages caused by wildfires. The number of fire outbreaks and the NDVI index were the variables with the greatest influences on the occurrence of transmission line outages in spans exposed to wildfires.
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