电力线路跨越铁路断线路线冲击力仿真研究

Transient Process of High Voltage Transmission Line Break and Shock on Railway Intersection

研究目的:跨越铁路的电力线路在风载荷及覆冰作用下会出现断线落线情况,威胁铁路的运行安全。本文针对该问题开展研究,建立了柔性导线结构断线模型,得到了跨越铁路的电力线路断线路线冲击暂态过程,获得了挂线点高度、交叉角度对断线冲击力及冲击应力的影响规律。研究结论:(1)断线冲击力随着挂线点升高而增大,对于35 kV电力导线,挂线点高度为120 m时,碰撞力幅值接近20 kN;(2)断线冲击力随着电力线路与铁路线路的交叉角度的增加而减小,交叉角度从15°增加至90°时,碰撞力减小近50%;(3)结合本文的研究方法,计算获得京张铁路110 kV电力线路断线与防护结构的冲击力13 kN,35 kV电力线路断线落线碰撞力8.4 kN,该数据设计了防护结构的横梁布局,同时上述成果可为电力线路防护棚洞强度设计提供数据支持。

Research purposes:The power lines crossing the railway will break and fall under the action of wind load and ice cover,which will threaten the safety of railway operation.Aiming at this problem,the paper established a flexible wire structure breaking model,obtained the impact transient process of the power line breaking route across the railway,and obtained the law of the influence of the hook point height and cross angle on the impact force and impact stress of the line breaking.Research conclusions:(1)The impact force of breaking wire increases with the increase of the hanging point.For 35 kV power wire,when the height of the hanging point is 120 m,the impact force amplitude is close to 20 kN.(2)W ith the increase of the intersection between the power line and the railway line,the collision force is reduced by nearly 50%when the intersection angle is increased from 15°to 90°.(3)Combined with the research method of the paper,the impact force between the 110 kV power line break and the protection structure of the Beijing-Zhangjiakou Railway is 13 kN,and the impact force of the 35 kV power line break and fall is 8.4 kN,and the beam layout of the protection structure is designed based on the data.At the same time,the above results can provide data support for the strength design of power line protection shed hole.