基于动力相似关系，以某1000kV八分裂输电线路为工程原型，设计了输电导线-电涡流阻尼器系统的1:17大比例缩尺试验模型。通过导线-阻尼器系统的自振试验测定系统的等效阻尼比，并对电涡流阻尼器的安装位置，刚度系数、阻尼系数以及导线初始张力等设计参数对系统等效阻尼比的影响进行了相关研究。为了验证由自振试验所确定的阻尼器最优参数下的真实防舞效果，在易舞风攻角下，对安装阻尼器前后覆冰导线-阻尼器系统的线性化运动方程的特征值实部进行了计算，发现安装阻尼器将明显提高导线起舞风速；利用ANSYS软件对易舞风攻角下的导线舞动响应进行了仿真模拟研究，安装阻尼器后覆冰导线不再激发舞动，防舞效果非常明显。并得到了如下结论：导线系统的一阶等效阻尼比将随着阻尼器阻尼系数的增大呈现先增大后减小的趋势，存在一个最优阻尼系数Copt，而阻尼器刚度的存在不利于阻尼器发挥减振效果；阻尼器的安装位置越靠近跨中，导线系统的一阶等效阻尼比提升越明显，阻尼器的减振效果越好；导线初始张力越大，导线系统的等效阻尼比的最大值ξmax也会相应提高。
关键词：输电线路；电涡流阻尼器；等效阻尼比；缩尺模型试验；防舞
Abstract
Based on the dynamic similarity relationship, a 1000kV eight-bundled transmission line is taken as an engineering prototype, a large-scale test model of conductor-eddy current damper system with a scale ratio of 1:17 was designed. The equivalent damping ratio of the conductor-damper system was measured through the self-vibration test of the system, and the influence of the installation position, the stiffness coefficient, the damping coefficient of damper, initial tension of conductor on the equivalent damping ratio was researched. In order to verify the real anti-galloping effect of the damper under the optimal parameters determined by the natural vibration test, at the wind attack angle which is prone to galloping, the real part of the eigenvalues of the linearized motion equation was calculated before and after the installing the dampers, it is found that the installing dampers will significantly increase the galloping critical wind speed; and the conductor galloping under wind attack angle which is prone to galloping was simulated by ANSYS software, it can be found that the iced conductor will not gallop after installing dampers, and the anti-galloping effect of the damper is very obvious. The following conclusions were obtained: the equivalent damping ratio of the system will first increase and then decrease with the increase of the damping coefficient of the damper, there is an optimal damping coefficient Copt for damper, and the existence of the auxiliary stiffness of the damper is unfavorable for the damper to play the effect of vibration reduction and energy dissipation; when the installation position of the damper is closer to the middle of the span, the first-order equivalent damping ratio of the system is improved more obviously, and the vibration mitigation effect of the damper is correspondingly better; the maximum value of the equivalent damping ratio of the system will also increase with the increase of the initial tension.
Key words: Transmission line; eddy current damper; equivalent damping ratio; scale model test; anti-galloping
关键词
输电线路 /
电涡流阻尼器 /
等效阻尼比 /
缩尺模型试验 /
防舞
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Key words
Transmission line /
eddy current damper /
equivalent damping ratio /
scale model test /
anti-galloping
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