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The serious consequences of transmission lines tripping fault induced by wildfires ( TLTFIW ) urges scholars to pay more attention to the safe operation of transmission lines. To illustrate the evolution process of  TLTFIW  and quantitatively evaluate the occurrence probability of subsequent events, an algorithm used for  TLTFIW  is proposed by using ETA, FTA and fuzzy number theory in this paper. The evolution process of  TLTFIW  is simulated according to ETA, which is divided into six stage including wildfires occurring, early wildfires early-monitoring, Wildfires extinguishing, Wildfires spreading, transmission lines tripping, and re-closing failure. In addition, the reason of the subsequent events in the evolution process are analysed by FTA, and the trapezoidal fuzzy theory is employed to calculate the probability of each events. Finally, based on the evaluation results, suggestions are provided for the evolution links with greater risks. Furthermore, transmission lines located in Xiangxi is introduced to present an application of the algorithm.

Risk Analysis for Evolution of Transmission Lines Tripping Fault Induced by Wildfires located in Xiangxi, China