Study on Galloping of Transmission Lines Based on Multi-scale Method

With the increase of transmission line mileage and more frequent occurrence of extreme weather, the possibility of transmission line galloping is also increasing. The nonlinear dynamic equation of transmission line is established in this paper. This equation is combined with the modal superposition method. The theoretical analysis of the transmission line is carried out by the multi-scale method, and the analytical solution of the nonlinear vibration of the iced conductor is obtained. Finally, the multi-scale solution is carried out by applying the nonlinear aerodynamic load. The results show that the multi-scale method can effectively reflect the nonlinear vibration characteristics of conductor on time scale. According to the multi-scale theory, the approximate solution of nonlinear galloping of iced conductor can be obtained. This result has important application value for the prediction of transmission line galloping tension and galloping amplitude, which is helpful for the design of transmission line anti-galloping.