WIND TUNNEL TEST ON AEROELASTIC MODEL OF 500 kV TRANSMISSION LINE SYSTEM

摘要

In order to investigate the wind-induced vibration of 500 kV double-circuit transmission line system, an aeroelastic model was designed with discrete stiffness method according to the characteristics of transmission tower structure. Under multiple wind attack angles and wind velocities, wind tunnel tests on the model of single tower and tower-line system consisting of five towers and four spans of conductors were performed respectively in turbulent flow. The time history of both displacement and acceleration of the model was obtained. The experimental results show that the wind attack angle greatly affects the mean displacement. The mean displacement of tower-line system in along-wind direction is much greater than that of single tower. The conductors influence the acceleration root mean square (RMS) oppositely in two directions: in Xdirection the acceleration RMS of tower-line system is larger than that of single tower while in Ydirection the acceleration RMS of tower-line system is less than that of single tower, which indicates that conductors significantly constrain the vibration in Y-direction. The same conclusion is evidenced in study of the power spectrum of acceleration. It can also be observed that the acceleration RMS in alongwind direction is as same order of magnitude as that in transverse direction for all cases. The crosswind vibration should not be neglected.