摘要
覆冰导线脱冰可能造成金具、导线和杆塔等构件受力破坏,也可能会引起导线闪络、烧断等电力事故。设计了1∶50的三跨覆冰导线的缩尺模型,采用熔断集中荷载的方法模拟导线脱冰,共七种工况研究三跨导线中脱冰量、脱冰跨位置、覆冰厚度和风速等参数不同时,导线的冰跳高度、导线张力和绝缘子轴力变化规律。结果表明:边跨脱冰将引起比中间跨脱冰更大的竖向振动,跳跃高度增大了近7%,导线张力也有明显增大;在风荷载作用时,导线脱冰振动会受气动阻尼影响,跳跃高度和振动周期都有所减小,导线张力和悬垂绝缘子的轴力随着风荷载增大而增大。
Icing conductors' ice-shedding may lead to damages of end fittings,wires and towers,and even tower collapse and other machinery accidents. A three-span 1∶50 scale model tests for icing conductors were conducted to obtain conductor's ice-jump height,conductor's tension force and axial force changes of insulators. In tests,ice-shedding loads were simulated with suddenly dropping dead-weights from conductors. Seven ice-shedding cases were studied with different magnitudes of ice-shedding,positions of ice-shedding span,ice thicknesses and wind velocities,etc. The results showed that conductor side-span ice-shedding causes larger vertical vibration than mid-span ice-shedding does,conductor 's jumping height increases by near 7% and conductor 's tension force rises obviously; when there are wind loads,conductor's ice-shedding vibration is affected by aerodynamic damping,conductor's jumping height and vibration period become smaller,conductor tension force and insulator axial force increase with increase in wind loads.
出处
《振动与冲击》
EI
CSCD
北大核心
2018年第3期223-229,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(51178489)
关键词
覆冰导线
脱冰
模型试验
风洞
振动
icing conductor
ice-shedding
model test
wind tunnel
vibration
