500kV输电线路新型防振金具

New Anti-vibration Hardware Fittings for 500kV Transmission Line

新型防振金具减振防舞阻尼弹簧间隔棒改进了传统金具在减振方面的方法,采用阻尼弹簧和重球联合减振来抑制输电线路微风振动。此新型防振金具在组件构成和结构形式上都有较大创新,使间隔棒框架、阻尼弹簧和重球组成一个整体,通过阻尼弹簧和重球的持续运动将振动的能量耗散掉,获得减振效果。运用ANSYS有限元软件建立装有间隔棒的四分裂导线模型,模拟微风振动,通过对比无间隔棒、加普通间隔棒、加减振防舞阻尼弹簧间隔棒情况下的位移时程曲线,得到此新型防振金具在减振性能方面的优越之处,相同时间内减振防舞阻尼弹簧间隔棒能将导线的最大振幅降到最低。通过非线性拟合和参数优化获得最优减振性能的间隔棒参数,运用ANSYS验证优化数据的正确性,最终得到当重球质量取1.8kg,弹簧刚度取0.7kN/m时,减振防舞阻尼弹簧间隔棒取得最优减振效果。

A new anti-vibration hardware, that is, the damping spring spacer of vibration and dance reduction has improved the method of traditional hardware fittings in vibration reduction, adopting the joint vibration reduction of damping spring and heavy ball to keep down breeze vibration in the transmission lines. The quite big innovation has achieved on the components and structure form of new anti- vibration hardware by forming spacer framework, damping spring, and heavy ball as a whole. For obtaining the effect of vibration reduction, the vibration energy is dissipated through the constant movement of damping spring and heavy ball. The finite element software of ANSYS is used to build conductors on a quad bundled model equipped with spacer to simulate breeze vibration. By comparing the curves of displacement process in the cases of no conductor spacer, ordinary conductor spacer, and damping spring spacer of vibration and dance reduction, respectively, it is known that the strengths of the new anti-vibration hardware in vibration reduction, i.e. damping spring spacer of vibration and dance reduction is able to decrease the maximum amplitude of the conductor to the minimum at the same time. Conductor spacer parameter with optimal vibration reduction performance is obtained by nonlinear fitting and parameter optimization. ANSYS is used to verify optimal data, and finally found that when the quality of heavy ball is 1.8kg and the stiffness of spring is 0.7kN/m, damping spring spacer of vibration and dance reduction is able to achieve the optimal effect of vibration reduction.