输电线路档距组合对覆冰导线动态特性的影响分析

Impact Analysis of Transmission Line Span Combination on Dynamic Characteristics of Iced Conductor

为更深入地研究输电线路塔线系统动态特性,完善各项参数对覆冰导线及杆塔的影响规律,采用模拟实际线路的3自由度多档距组合动态程序进行典型线路的仿真模拟计算。通过控制变量法,得出了档距组合对于塔线系统不平衡张力的影响规律,并探讨了现有的相间间隔棒的安装策略对于杆塔及相邻档导线的影响。仿真结果表明,发生风偏时,线路的不平衡张力随档距的增大而不断加大,且增大的幅度也不断上升;发生脱冰跳跃时,不平衡张力随档距的增大而增大,且脱冰档档距与非脱冰档档距对不平衡张力的影响不同;发生导线舞动时,杆塔两侧的不平衡张力随档距的增大而增大,但舞动档档距和未舞动档档距对不平衡张力的影响波形不同。同时发现,采取现有的相间间隔棒安装策略,相间间隔棒的安装对于相邻档的影响不大,能够有效减低导线舞动幅值,而且不会增加塔线系统的力学负担。

In order to further study dynamic characteristics of tower-line system,and to complete the influence rule of related parameters affecting iced conductors and towers,we simulated and calculated typical lines by applying a dynamic program of three degrees of freedom multiple span combination simulating actual lines.Through the control variable method,the span combination law for the unbalanced tension of the tower-line system was obtained,and effect of the existing phase-to-phase spacers’ installation strategy on the conductors of the adjacent span was discussed.Several conclusions can be drawn according to the simulation results： when wind deviation happens,the unbalanced tension increases faster and faster with the span increasing;when ice-shedding happens,the unbalanced tension increases with the span increasing,but the changes in unbalanced tension of shedding span and un-shedding span are different;when galloping happens,the unbalanced tension increases with the span increasing,but the waveforms of unbalanced tension between galloped span and un-galloped span are different.Moreover,it is concluded that applying the existing phase-to-phase spacers’ installation strategy,the phase-to-phase spacer installation has little effect on the mechanics of its neighboring span,but it reduces the galloping amplitude while barely increasing the mechanical burden of tower-line systems.