合理布置分裂导线的间隔棒以减小舞动

Reasonably arranging spacers of bundle conductors to combat galloping

针对结冰分裂导线舞动问题,提出了合理布置间隔棒以减小分裂导线舞动的对策。先导出气动力在分裂导线半波舞动时一个周期内的功的表达式,再分析此功与子导线的位移在档内的分布及子导线的攻角在档内分布的关系。间隔棒使子导线的扭转角减小,使子导线的冰形趋于一致,使气动力的攻角趋于一致,而作用在子导线的上的气动力是攻角的函数,从而间隔棒使作用在子导线的上的气动力趋于一致,导致分裂导线舞动的可能性增大。最后得到的结论是:对于分裂导线的半波舞动,增大档内中部的次档的长度,可减小分裂导线的半波舞动。

To combat galloping of iced bundle conductors, the countermeasure of reasonable arrangement of the spacers is put forward. The expression of the work done by the aerodynamic force during one period of half wave galloping of bundle conductors is deduced first, and the relation between the work and the sub-conductor＇s displacement in span, as well as that between the work and the sub-conductor＇ s angle of attack in span is analyzed. It is pointed out that the spacer makes the torsion angle of the sub-condnctor small, the ice shape of the sub-conductor unanimous, the aerodynamic force＇s angle of attack unanimous, and the aerodynamic force on the sub-conductor unanimous since the force is a function of the angle of attack, and thus the galloping of the bundle conductors is quite possible to happen. The conclusion is that the half wave galloping of the bundle conductors can be mitigated by increasing the length of the sub-span in the centre of span.