Effect of High-Speed Train on Vibration and Fatigue Life of Transmission Lines

There are frequent reports of cable rupture accidents on the transmission line crossing high-speed railways. A simulation method for dynamic response and fatigue life of transmission lines considering natural wind and train induced wind is presented and verified by field tests. Based on a case study, the displacement time history and fatigue damage of conductors under wind loads are analyzed, and the effects of different parameters are discussed. The results show that the fatigue damage caused by train induced wind can reach 127% of natural wind, and its influence on the fatigue life of transmission lines cannot be ignored. Raising height or avoiding the most unfavorable span length can effectively reduce the influence of train induced wind. The proposed method can be used for the structural design and safety assessment of transmission lines crossing the high-speed railway, and it can provide references to the design of damping devices.