摘要
在外力作用或环境温度变化的条件下,输电导线上的覆冰会发生脱落,引起导线大幅振动,进而引发线路结构破坏或闪络跳闸故障。前期研究重点关注覆冰脱落本身引起的导线振动特性,部分研究中考虑风载荷的作用时,通常假设整个脱冰过程中风载荷为恒定值,忽略了风载荷随时间变化的特性及其对导线脱冰响应的影响。文中采用ABAQUS的用户自定义单元描述时变风载荷,并基于有限元方法研究风载荷变化对导线脱冰跳跃运动特性的影响。以典型的新月形覆冰为研究对象,模拟了时变气动载荷作用下导线脱冰跳跃时的动态特性,重点探讨了不同风速、风载荷类型、脱冰率对导线跳跃高度、水平摆动距离及运动轨迹的影响。研究表明,脉动风相比平均风对导线脱冰跳跃位移轨迹具有显著影响。在相同脱冰率的情况下,脉动风会增加导线的跳跃高度及横摆范围。研究成果为准确获取脱冰过程中导线的运动特性和开展输电线路电气间隙设计提供了支撑。
Under external forces or ambient temperature changes,ice accretion on transmission line conductors may shed,inducing large-amplitude conductor vibrations.This can subsequently lead to structural damage or flashover trip faults.Previous research primarily focused on the vibration characteristics induced by ice shedding itself.When wind load effects were considered in some studies,the wind load was typically assumed constant throughout the shedding process,neglecting its time-varying characteristics and their influence on the conductor’s ice shedding response.This study employs the User Element subroutine in ABAQUS to describe the time-varying aerodynamic loads and investigates the impact of wind load variations on the ice shedding motion characteristics of conductors based on the finite element method.Taking typical crescent-shaped ice accretion as the research object,the dynamic characteristics of conductor ice shedding under time-varying aerodynamic loads were simulated,with a focus on the influence of different wind speeds,wind load types(i.e.,mean wind and fluctuating wind),and ice shedding rates on conductor jump height,horizontal swing amplitude,and motion trajectory.The study reveals that fluctuating wind significantly influences the displacement trajectory of conductor ice shedding compared to mean wind.Under identical ice shedding rates,fluctuating wind increases both the conductor’s jump height and horizontal swing range.The research findings provide support for accurately determining the motion characteristics of conductors during ice shedding and for designing electrical clearances in transmission lines.
作者
左林东
李林
姬昆鹏
王小川
ZUO Lindong;LI Lin;JI Kunpeng;WANG Xiaochuan(School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206;Department of Power Transmission and Transformation Engineering,Technique,State Grid Electric Power Engineering Research Institute,Beijing 100055;Key Laboratory of Icing and Anti/De-icing,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000;Emergency Repair Center(Grid Operation&Maintenance Branch),State Grid Sichuan Electric Power Transmission&Transformation Construction Co.,Ltd,Chengdu Sichuan 610000)
出处
《东北电力大学学报》
2025年第4期1-8,共8页
Journal of Northeast Electric Power University
基金
中国空气动力研究与发展中心结冰与防除冰重点实验室开放课题(IADL20220201)
中国电力科学研究院有限公司自筹创新基金(GC80-23-002)。
关键词
输电线路
脱冰跳跃
跳跃高度
时变气动载荷
用户自定义单元
transmission line
ice shedding
wind attack angle
time-varying aerodynamic load
user element
