风荷载作用下输电线路数值模拟及金具失效分析  

Numerical Simulation of Transmission Line and Failure of Fittings under Wind Load

作　　者：刘小会[1,2] 周晓慧 叶中飞 伍川 张博 黄飞 LIU Xiao-hui;ZHOU Xiao-hui;YE Zhong-fei;WU Chuan;ZHANG Bo;HUANG Fei(State Key Laboratory of Bridge and Tunnel Engineering in Mountain Areas,Chongqing Jiaotong University,Chongqing 400074,China;College of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology,State Grid Henan Electric Power Research Institute,Zhengzhou 450052,China)

机构地区：[1]重庆交通大学省部共建山区桥梁及隧道工程国家重点实验室,重庆400074 [2]重庆交通大学土木工程学院,重庆400074 [3]国网河南省电力公司电力科学研究院输电线路舞动防治技术重点实验室,郑州450052

出　　处：《科学技术与工程》2020年第20期8210-8217,共8页Science Technology and Engineering

基　　金：国家自然科学基金(51308570,51277186,51507106);重庆市科委基础与前沿项目(cstc2017jcyjAX0246)。

摘　　要：为了缓解风荷载作用下输电线路动力响应造成电力金具断裂失效等问题,通过建立整体输电线路有限元模型,利用随高度变化的Kaimal风速谱和Davenport互相关谱,用谐波叠加法模拟沿输电线路方向多点互相关的随机风风速时程曲线,利用模拟的随机风荷载进行输电线路动力响应分析,提取导线单元的应力并换算为传递给线夹的集中力,对比稳定风荷载计算方法,建立随机风荷载和稳定风荷载两种典型的荷载工况,再通过ABAQUS建立整体连接金具有限元模型,研究了输电线路整体结构中连接金具及复合绝缘子的应力情况。结果表明:风荷载对金具应力有显著影响;在整体模型中,球头挂环较其他金具容易发生断裂破坏,其次是线夹和直角挂板;复合绝缘子杆部连接处采用球头球窝连接方式,容易产生较大弯曲应力而造成杆部过渡处断裂。To solve the problem of power fittings breaking and failure caused by the dynamic response of transmission line under wind load, a finite element model of the whole transmission line was established, in which the Kaimal wind speed spectrum and Davenport cross-correlation spectrum were applied with height change, and the harmonic superposition method was adapted to simulate the random wind speed history for multi-point cross-correlation along the direction of transmission line. In addition, the simulated random wind load was input into the dynamic response analysis of transmission line, and the stress of conductor element was extracted and converted into the concentrated force transmitted to the clamp. Compared with the calculation method of stable wind load, two typical load cases of random wind load and stable wind load and then the finite element model of integral connecting hardware were established in the software ABAQUS, in which the stresses of connecting hardware and composite insulator in the overall structure of transmission line were determined. The results show that the wind load is the main factor on the stress of the fittings. In the overall model, the ball-head hanging ring is easier to break than other fittings, followed by the wire clamp, and right angle hanging plate;and the ball-head ball socket connection is adopted at the joint of the composite insulator rod, which is easy to built a large bending stress and cause the fracture at the transition of the rod.

关 键 词：输电线路 风荷载 电力金具 断裂失效 

分 类 号：TM754[电气工程—电力系统及自动化]