In this paper

with the purpose of studying windage yaw of UHV transmission line

the reason of the faultpoint based on the 1 000kV Nan-Jing line I windage yaw accident is analyzed. Firstly

the rigid rod method is takenwhich given by standard to calculate windage yaw angle with using two different wind pressure non-uniform coeffi-cients which refer to 0.61 and 0.75. Both results were less than the threshold. Based on prior research

the drag coeffi-cient of split conductors is determined and a wind tunnel test is carried out to make certain the reasonable value ofthe drag coefficient of insulator string. Then the wires-insulator strings model is established by Ansys and the wind ve-locity time series are generated by harmony superposition method. According to the Ansys model and wind velocitytime series

the time history analysis of the windage yaw are executed. The result shows that the amplification of pul-sating effect couldn’t be neglected. On the basis of the results above

it is recommended that the pulsating effectshould be taken in consideration during design and checking calculation

as well as the reasonable value of wind pres-sure non-uniform coefficient. Finally

it is analyzed that the windage yaw angles under 5 different wind velocity and the fitted curve is figured out. As a result

the possible reason for this accident could be severe convection weather.