The Reliability Evaluation of an Overhead Transmission Line based on the Fault Tree Model

Abstract

The overhead transmission line is the main part of a power system, whose state affects the reliability and stabilization of the power system. Therefore, the state of an overhead transmission line must be evaluated to protect the power system. This study analyzed the relationship between the common failure modes of transmission lines and their influencing factors, chose the influencing factors as the characteristic parameters, and built the fault tree model of an overhead transmission line. It used the improved analytic hierarchy process to evaluate the importance of the fault mode, and then calculated the corresponding weights of different fault tree models. The study also used the relative deterioration degree and membership function to calculate the probability of all kinds of faults. The correctness and validity of this model was verified by the operation data of the Guangxi grid.