考虑电磁力影响的四分裂导线舞动

导线舞动是输电线路的一种低频、长时间的流固耦合现象。舞动通常会造成线路的严重破坏,特别是在高压多分裂导线架空输电线路,舞动现象会更加复杂。虽然现有研究已经提出了一些简化的导线舞动理论;但输电线路的舞动行为仍然需要进一步分析,这主要取决于线路运行工况的细化分析。采用精细有限元法计算了四分裂导线间的电磁力,得到了一种考虑电磁力影响的四分裂导线舞动数值模拟方法。此外,重点研究了电流强度对典型四分裂输电导线舞动特性的影响,包括舞动轨迹、频率、舞动模式和振幅。同时,进一步分析了在不同档距和风速下,考虑电磁力影响的四分裂输电导线舞动特征。结果表明,电磁力对线路的导线舞动行为有明显的影响。因此,有必要考虑导线舞动过程中的电磁力影响。

Investigation on Galloping Behaviors of Quad Bundle Conductor Lines with Considering Effects of Electromagnetic Forces

Iced conductors galloping is a low frequency and long lasting-time fluid-solid coupling phenomenon, which usually causes serious damage, especially in the ultra-high voltage (UHV) overhead power transmission lines with multi-bundle conductors. Although some simplified iced conductors galloping theories have been proposed, the galloping behaviors of transmission lines, which strongly depends on the working condition detail, is still need to be deeply investigated. Here, the meticulous finite element method for calculating the electromagnetic force between sub-conductors of quad bundle conductors has been proposed. Then, a method for galloping with considering the electromagnetic force is achieved. Furthermore, the effects of current intensity on iced conductors galloping behaviors, including dynamic responses, galloping orbits, frequencies, vibration modes and amplitudes, of typical quad bundle conductor transmission lines are investigated. Meanwhile, the galloping characteristics of quad bundle transmission lines with different span lengths and wind velocities with considering the influence of electromagnetic force are studied. The results show that the electromagnetic force has obvious effect on galloping behaviors. Thus, it is necessary to consider the electromagnetic force during iced conductors galloping.