Effects of Wind Load on the Dynamical Characteristics of Transmission Line

Based on the nonlinear dynamics theory, the dynamical equations of transmission line under wind load is derived. The dynamical characteristics of transmission line under strong wind load are studied. The higher frequency part of wind load is considered as dynamic load, while the lower frequency part of wind load is considered as dead load caused by average wind speed. The wind load not only causes the change of the tension force of the transmission line, but also changes the vibration balance position of the transmission line. Considering the influence of vertical and lateral static displacement, the coupling vibration differential equation between various modes of transmission line is derived, and the influence of average wind speed on the natural frequency of transmission line is further studied. The research results have certain theoretical significance for the study of wind-induced vibration control of transmission lines.