分裂导线风扭摆的解析与防治

Investigation and Preventive Treatment for Wind-Induced Twisting and Swinging of Bundle Conductors

风扭摆在一定条件下会出现大幅度扭摆的情况,甚至引发事故。为此对分裂导线风扭摆的产生机理、不均匀张力对耦合振动的影响等方面进行了重点研究。结果表明,偏心分裂导线的水平横向和扭转振动之间存在耦合,在水平风力的作用下分裂导线水平摇摆运动时容易诱发扭摆运动,而且子导线间的不均匀张力进一步加强了这种耦合效应,因此不均匀张力也是诱发扭摆的重要内部因素。最后根据线路产生风扭摆的内在影响因素,提出了相应的治理措施。

As a kind of couple vibration due to common influences of many factors and wind action, wind-caused twisting and swinging of bundle conductors are frequently observed in the running of overhead transmission lines. Generally, wind-caused twisting and swinging do not lead to transmission line failure, however under a certain condition considerably violent twisting and swinging might occur and cause accidents. Speical attention is emphatically paid to the generation mechanism of wind-caused twisting and swinging of bundle conductors and the impact of asymmetry tension on coupled vibration. Research results show that there is coupling between horizontal transverse swining and twisting of eccentric bundle conductor, and under the horizontal wind action the horizontal swinging movement of bundled conductor is easy to induce twisting movement, and such a coupling effect is further intensified by asymmetry tension of sub-conductors, thus asymmetry tension is also an important internal factor to induce twinting movement. Finally, based on internal impacting factors that induce wind-caused twisting and swinging of transmission lines, corresponding treatment measures are proposed.