覆冰八分裂导线舞动过程中的次档距振动研究

通过数值分析的方法分析了八分裂导线的次档距振动现象和特征，对比数值模拟结果，寻找各子导线间的运动轨迹及舞动幅值的异同。结果表明覆冰八分裂输电线路各子导线在不同风速下舞动的方向均相同，但因受尾流干扰和气动载荷的影响，子导线在不同的风速下振动的幅值不相同，其舞动时程图极限为一个斜椭圆形。可见覆冰八分裂导线舞动过程中的次档距振动，可能会导致子导线发生碰撞，从而对特高压输电线路的安全运行造成危害。研究结果为特高压输电线路的舞动原理的研究和防振提供参考。

Investigation on the Sub-span Oscillation in the Process of Galloping of Iced Eight-Bundle Conductors

The phenomenon and characteristics of secondary pitch vibration of eight-bundle conductors are analyzed through numerical analysis, and the numerical simulation results are compared to find the trajectory and movement of each sub-conductor. Similarities and differences in dancing amplitude. The results show that the sub-conductors of the iced eight-bundle transmission line dance in the same direction at different wind speeds, but due to the influence of wake interference and aerodynamic loads, the vibration amplitudes of the sub-conductors are different under different wind speeds, and the vibrations of the sub-conductors are different. The limit of the time history diagram is an oblique ellipse. It can be seen that the secondary pitch vibration during the galloping process of the iced eight-bundle conductor may cause the sub-conductor to collide, which will harm the safe operation of the UHV transmission line. The research results provide a reference for the research of galloping principle and anti-galloping of UHV transmission line.