电力架空导线在覆冰状态下的风振响应分析

Wind-Induced Vibration Response Analysis of Overhead Transmission Lines Under Icing Condition

为研究电力架空导线自然风作用下的振动响应特征以及其受覆冰、防振锤等因素的影响,以某地区典型大跨度输电导线为研究对象,基于随机过程理论的谐波叠加法建立了设定工况下的脉动风模型,并进一步获得了自然风荷载的数学模型。采用通用有限元软件ANSYS对导线进行动力响应分析,对比了在自阻尼情况下裸导线和覆冰导线的风振响应特征。最后,通过将防振锤简化为弹簧振子,对覆冰导线-防振锤体系进行动力响应模拟,验证了多点集中布置防振锤对于控制导线在顺风向与垂直风向的振动响应均有一定的效果。

To investigate the vibration response characteristics of overhead transmission lines and the influence of icing and anti-vibration dampers,a typical long-span conductor was taken as the research object.The fluctuating wind model was established with the harmonic superposition method based on the theory of stochastic process,and then,the functional expression of natural wind load was obtained.The dynamic analysis of conductors was carried out by the general finite element software ANSYS.In the self-damping condition,the wind-induced vibration responses of bare conductor and ice-covered conductor were analyzed and compared.Finally,by simplifying the anti-vibration dampers as a spring vibrator,the dynamic response simulation was conducted on the system of ice-covered conductors and antivibration dampers,the effect of the multi-point centrally arranged dampers in controlling the vibration response of conductors was verified in both downwind and veritical wind directions.