输电线路悬索式跨越架抗冲击性能影响规律研究

目前悬索式跨越架的设计未考虑动态冲击效应。为了探究悬索式跨越架在不同工程参数下抗导线冲击的影响规律,文中以悬索式跨越架承载索常用的超高分子量聚乙烯绳为例,建立了绳索受冲击的仿真模型。文中研究不同工程参数对跨越架在事故工况下(断线和跑线)的抗冲击性能影响规律,得到基于桁架单元的动力学仿真与试验的最小误差为0.67%。仿真结果表明:因牵引板的作用,断线对跨越架产生的冲击载荷大约为跑线的2～3倍;跨越架冲击载荷随落线高度而增加,但具有一定随机性,其弧垂变化水平在4～4.5 m;中间承载索和绝缘网安全系数较小;1 250 mm~2导线比630 mm~2导线的线密度、配套使用的牵引板大,故1 250 mm~2导线对跨越架的冲击较大。

Impact behavior influence rules of suspension spanning frame in transmission line

The dynamic impact effect is not considered in the design of the suspension spanning frame in previous work. In order to explore the impact resistance law of the suspension spanning frame under different engineering parameters, the impact simulation model of the ultra high molecular weight polyethylene (UHMWPE) rope used in the load-bearing cable of the suspension spanning frame is established in this paper. The influence of different engineering parameters on the impact resistance of the suspension spanning frame under accident conditions of broken wire and running wire is studied. Research results show that the minimum error between the dynamic simulation based on truss element and the experiment is 0.67%. The simulation results show that the impact load of broken wire on the suspension spanning frame is about 2~3 times that of the running wire due to the appearance of the traction plate. The impact load of the suspension spanning frame increases with the height of the fall wires, but the law of the change has some randomness. The sag changed is 4~4.5 m. Besides, the safety factor of the middle cable and the insulation net is smaller than other parts of the suspension spanning frame. The linear density and the traction plate mass of the 1 250 mm² conductor is larger than that of the 630 mm² conductor. Therefore, the 1 250 mm² conductor has larger impact on the suspension spanning frame.