Wind tunnel test on wind-induced response of transmission tower and tower line coupling system

In order to investigate wind induced dynamic responses of high-voltage transmission tower and tower-line coupling system,aeroelastic models were designed based on a typical 500kV transmission tower.The responses of the single tower model and the tower-line coupling system model were tested under the turbulent flow in a boundary layer wind tunnel.The results show that the magnitude of the along-wind response and that of the across-wind response in the turbulent flow is in the same order.The sensitivity of the responses of the tower-line coupling system model to the wind is higher than that of the single tower model.The displacement responses on the top of the tower in the coupling system are much larger than that of the single tower.The coupling vibration phenomena between the tower and the cables are very obvious under the strong wind.The natural oscillation characteristic of the tower-line coupling system changes constantly and the vibration frequencies different from the linear tower system are aroused,which reveals that the wind-induced vibration of transmission tower-line coupling system has strong nonlinear dynamic characteristics.It is concluded that the design process for tower and cables of transmission line system need consider the influence of the coupling vibration.