冰风耦合环境下连接金具数值仿真分析  

Numerical Simulation Analysis of Connecting Fittings under the Coupling Environment of Ice and Wind

作　　者：路国闯 李新梅[1] 商利 杨现臣 王晓辉 LU Guo-chuang;LI Xin-mei;SHANG Li;YANG Xian-chen;WANG Xiao-hui(Department of Mechanical Engineering,Xinjiang University,Urumqi 830000,China)

机构地区：[1]新疆大学机械工程学院,乌鲁木齐830000

出　　处：《科学技术与工程》2023年第30期12985-12993,共9页Science Technology and Engineering

基　　金：国家自然科学基金(52161017,51865055)。

摘　　要：覆冰导线受风载作用产生的动张力可能会导致金具失效断裂,严重影响电网运行安全。为评估冰风载荷对连接金具的耦合影响,数值模拟得到随机风作用下不同覆冰形式导线关键点处动张力和位移,采用有限元软件ANSYS建立连接金具模型,对极端环境下整体连接金具应力场进行数值仿真,找出金具薄弱位置,并对危险部件U形挂环进行动力响应分析,分别探讨覆冰形式、张力变化、受力形式对U形环应力分布影响。结果表明:连接金具在极大冰风载荷下,U形挂环最容易出现失效,最大应力值为509.0 MPa,其次是联板孔洞处与挂板弯折处。对U形环的动力响应分析中,导线均匀覆冰时,覆冰15 mm时U形环有最大应力值为996.4 MPa,导线线性覆冰时,中央重覆冰下U形环发生屈服面积大于两侧重覆冰;在动张力作用下,当U形环间存在转动关系时要比纯张力作用下对U形环损害更加严重。The dynamic tension of the iced conductor generated by the wind load may lead to the failure and fracture of the fittings,which seriously affects the operation safety of the power grid.In order to evaluate the coupling effect of ice and wind,the dynamic tension and displacement at key points of conductors with different icing forms under the action of random wind were obtained by numerical simulation.The finite element model of connecting hardware were established in the software ANSYS.The stress field of Integral connecting hardware under extreme environment was simulated to find out the weak position of the fittings,and the dynamic response ana-lysis of the U-ring of dangerous parts was analyzed,and the influence of icing form,dynamic tension and force form on the stress distribution of the U-ring was discussed.The results show that U-ring is the most prone to failure in integral connection fittings under extreme ice wind load,and the maximum stress value is 509.0 MPa,followed by the hole of connecting plate and the bend of the hanging plate.In the dynamic response analysis of the U-ring,when the conductor is evenly iced,the maximum stress value of the U-shaped ring is 996.4 MPa when the conductor is covered with ice for 15 mm.When the conductor is linearly iced,the yield area of the U-ring of ice thickness in the middle of conductor is larger than the ice thickness on both sides.Under the action of dynamic tension,when there is a rotational relationship between U-shackles,the damage to U-shackles is more serious than that under the action of pure tension.

关 键 词：冰风耦合 输电线路 金具 应力分布 

分 类 号：TM753[电气工程—电力系统及自动化]