考虑高差覆冰输电线路链式脱冰振动  

Zippered Deicing Vibration of an Iced Transmission LineConsidering Altitude Difference

作　　者：晏致涛[1,2] 李孟珠 熊辉 游溢[1,3] YAN Zhitao;LI Mengzhu;XIONG Hui;YOU Yi(School of Civil Engineering,Chongqing University,Chongqing 400045,China;School of Architecture and Engineering,Chongqing University of Science&Technology,Chongqing 401331,China;State Grid Xinjiang Electric Power Company Electric Power Research Institute,Urumqi 830011,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆科技学院建筑工程学院,重庆401331 [3]国网新疆电力公司电力科学研究院,新疆乌鲁木齐830011

出　　处：《湖南大学学报（自然科学版）》2020年第3期115-121,共7页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51778097);重庆市科委自然科学基金重点项目。

摘　　要：输电线路是电网中重要的生命线工程,覆冰荷载是输电线路最大威胁之一.以国网新疆电力科学研究院某工程为研究对象,采用商业软件ANSYS进行输电线路的有限元数值仿真,通过冰单元生死技术实现对覆冰输电线链式和同时脱冰振动的有限元分析,得到等高差和有高差下单跨输电线脱冰跳跃高度的规律,由此与缩尺模型实验结果进行对比分析.研究表明:链式和同时覆冰导线脱冰模拟结果与实验吻合很好,相差在5%以内,证明了模拟方式的准确性;在等高差链式脱冰下,随着脱冰速度的增大,最大脱冰跳跃高度会增大逼近到一个定值,而最大轴力不随脱冰速度变化而变化.有高差链式脱冰情况下,保持初张力不变时,随着高差的增大,跨中最大脱冰跳跃高度近似指数增大,链式脱冰的最大跳跃高度逐渐逼近同时脱冰的跳跃高度值;高差的存在会加剧输电线的上翻情况,也即是脱冰跳跃最大高度大于覆冰后的垂度,可以通过降低输电线的初张力或者覆冰厚度来减少上翻情况的发生,降低危险隐患.Overhead transmission lines are lifeline projects,and ice load is one of the greatest threat to transmis-sion lines safety.On the basis of the project of Chinese Grid Xinjiang Electric Power Research Institute,the finite ele-ment numerical simulation models of overhead transmission lines were established by means of ANSYS software.Us-ing the technique of birth and death of the element for ices,the finite element analyses of zippered and simultaneous ice-shedding vibrations were carried out.By analyzing the modeling parameters of the overhead transmission lines,the influence of altitude difference on the vibration response of single-span ice overhead transmission lines was stud-ied,and compared with the results of the experiment of the scaled model.The results show that the simulations of the zippered and simultaneous ice-shedding are well matched with the experimental results and the discrepancies are less than 5%,which proves the accuracy of the simulation method.If the altitude of two suspension points is the same,the maximum jumping height first increases with the deicing speed and then is maintained at a constant value,while the maximum force is not affected by the deicing speed.If the altitude of the two suspension points is different,the maxi-mum jumping height increases exponentially with the increase of altitude,and the jumping height of the zippered iceshedding gradually approaches the value of simultaneous ice-shedding when the initial stress is constant.The exis-tence of altitude aggravates the upturn of lines,and the maximum jumping height is greater than the sag of iced line.Meanwhile,the occurrence of upturn can be reduced by decreasing the initial stress and icing thickness of transmis-sion lines.

关 键 词：架空输电线路 数值仿真 覆冰 跳跃高度 振动 

分 类 号：TM75[电气工程—电力系统及自动化]