真型大跨输电线路的舞动模拟与失谐控制

Galloping simulation and detuning control of prototype transmission line

近年来,越来越多的大跨输电线路开工建设,此类输电线路往往处于自然条件恶劣的地区,极易引发舞动现象。本文基于真型八分裂输电线路的气动力实测数据和实际结构的材料、几何物理参数,采用考虑抗弯、抗拉及抗扭刚度耦合的六自由度梁单元模型,应用大型有限元软件ANSYS编写有限元批处理程序,研究了该输电线路的舞动响应及分散间隔棒对Nigol扭振机理引发舞动的影响特性。结果表明,分散间隔棒对Nigol舞动有明显的抑制作用,而对Den Hartog舞动抑制作用较小。

Recently,more and more large-span transmission lines are under construction.However,these lines are usually located in the places with poor natural condition,which makes them prone to galloping phenomena.This article is based on the experimental data and material and geometric physical parameter of practical 8-bundle transmission lines.By using the model built by beam elements with 6 degrees of freedom which considering bending rigidity,extensional rigidity and torsional rigidity coupling galloping based on ANSYS FEM,the change features of torsional characteristics and the galloping of transmission line and the galloping of the Nigol mechanism influenced by dispersive spacer are analyzed,then proposing the single-phase anti-galloping conceptual design of EHV transmission line by verified.The results show that the dispersive spacer has the obvious inhibitory action on the galloping of the Nigol mechanism,but it doesn t work when it comes to the galloping of the Den Hartog mechanism.