Development of Analysis Method for the Flashover Rate Due to Lightning on Power Distribution Lines in Consideration of Cost Performance

Abstract

High reliability of electric power supply is requested by the rapid evolution of information-oriented and computerized society. On the other hand, it is important to consider the cost down on power distribution lines in power companies. From this point of view, the authors developed an analytical method that can calculate flashover rate caused by lightning considering both the reliability and cost performance. As the results of calculations, it is clear that the flashover rate is significantly influenced by various parameters such as the lightning current waveform and nearby buildings. Moreover it is clear that the flashover rates of power distribution lines for various lightning protection designs are much different even if the constructing costs of power distribution lines are the same.