Research on interference effects of wind load on bundled conductors

It is important to take into account the drag coefficient and interference shielding effect under different wind conditions in the design of bundled conductors.However,it is a com-plex problem under different wind angles and Reynolds numbers conditions.In this paper,wind tunnel test on a sectional conductor model with 1m long and 1:30 aspect ratio was firstly conduc-ted to investigate the influence of Reynolds number and wake effect on the mean drag coefficient of bundled conductors.Then,sectional model tests of 4-,6-and 8-bundled conductors under dif-ferent wind attack angles and velocities in the uniform flow were conducted to analyze the shiel-ding effect of drag coefficient of bundled conductors.The results indicate that the interference shielding effect is evident for multi-bundled conductors.In addition,the variation of the wind attack angle has great effect on the wind loads,the values of which are obviously smaller than that of the current design specification.Therefore,it is of great importance to pay attention to the influence of the wind attack angle and interference shielding on the wind load computation in the design of bundled conductors.