Wind load is an important factor which affects the safe operation of high voltage overhead transmission lines. In order to analyze the laws of tower-line coupling system

based on typical tower structure of a 220 kV transmission line in Guangdong

a finite element model of a multi-tower-line coupled system

including three towers and two span lines

is established using the development environment of international finite element method program ANSYS. Then

considering the local meteorological conditions in Zhanjiang

davenport power spectrum is used to generate wind speed histories of a given field. Finally

this generated wind field is applied in wind-induced dynamic response analysis of the coupled system

and the dynamic response results of the middle transmission tower in the above coupled system are compared with quasi-static analytical of the solo tower. It is found that tower displacement along the line of dynamic analysis is about 5.2 times

and vertical line displacement is about 1.3times the quasi-static analysis. Besides

the axial stress in tower of part of the main unit is significantly increased

indicating the existence of certain limitations of the current design code

which need to be further improved.