With the collapsed large crossing tower line system of the island in typhoon “Hagupi” in 2020 as the research object

the influence of typhoon“Hagupi”on Dongtou island power grid is analyzed. The finite element model of free-standing tower and tower line system is set up by Ansys and the dynamic characteristics of them are analyzed firstly. Then

the static load and fluctuating wind speed time history fitting method of transmission tower line system are studied in combination with the existing specifications. The static analysis and dynamic time history analysis at wind direction angles of 0° and 90° are carried out respectively. The static load response of the displacement and main material stress as well as wind vibration response of transmission tower in free-standing tower and tower line system are obtained. Not only the static load of wind load and wind induced vibration response considering fluctuating wind of bare tower and tower line system are compared and analyzed

but also the influence of different wind direction angle on the wind load effect of transmission tower is compared. In addition

the frequency domain analysis method is adopted to perform power spectrum analysis of wind load effect of transmission tower

which further reveals the load effect of fluctuating wind and the coupling effect of grounding wire. Finally

the wind-induced vibration coefficient of displacement of free-standing tower and tower line system is analyzed on the basis of displacement response of transmission tower. The research and related conclusions have important reference value for the wind resistance design and reinforcement of transmission tower in the future.