Lightning Failure Risk Assessment of Overhead Transmission Lines Based on Modified Dempster–Shafer Theory

Lightning has a certain degree of potential threat to the safe operation overhead transmission lines. In order make targeted lightning protection arrangements and reduce impact on lines, it is necessary conduct risk assessments This paper proposes failure assessment method for lines based modified Dempster–Shafer theory. First, analyze historical data line, determine factors, use confidence express relationship between factor; then, entropy weight theory gray relational calculate value mass function, modify this basis; finally, trust fit with calculated trip rate produce assessment. analyzes in some areas Hebei Province. The results show that, compared evaluation theory, accuracy improved extent after correcting function value. It can be seen that integrate comprehensively consider different provide reference preventing damage by strike weather.