复合横担覆冰断线的动力分析与强度设计  

Dynamicb analysis and strength design of composite cross arm considering icing conductor-breaking effects

作　　者：陆兴华 吴佰建[1] 郭小明[1] LU Xinghua;WU Baijian;GUO Xiaoming(School of Civil Engineering,Southeast University,Nanjing 211189,China;Jiangsu Electric Power Industrial Management Co.,Ltd.,Nanjing 210024,China)

机构地区：[1]东南大学土木工程学院,江苏南京211189 [2]江苏苏电产业管理有限公司,江苏南京210024

出　　处：《电力工程技术》2021年第6期193-198,共6页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(51878154)。

摘　　要：随着全球低温、雨雪、冰冻等灾害性天气的频发,电力线路覆冰造成的危害越来越严重。针对现有复合横担设计时主要基于静力学而未考虑复杂运营荷载下动力分析的不足,文中对10 kV复合绝缘横担在覆冰断线工况下的力学性能展开研究,在确定断线点位置的基础上,对断一根及多根导线的情况进行数值计算,讨论复合横担在覆冰断线工况下的动态应力响应特征并和覆冰静载情况下的应力水平比较,得到动力放大系数以衡量断线冲击作用。结果表明:当导线发生断线时,横担关键截面应力会有不同程度的增加,对与断点位置有直接联系的复合横担根部影响较大,在设计中应加以考虑;断线后横担上关键截面危险点的应力放大系数在1.1~1.3;多根导线同时发生断线时它们之间的相互影响较小。With the frequent occurrence of severe weather such as low temperature,rain,snow and ice in the world,the damage caused by ice coating on electric power lines is becoming more and more serious.In view of the existing composite cross arm design,it is mainly based on statics and does not consider the dynamic analysis under complex operational loads.In this paper,the mechanical properties of 10 kV composite insulated cross arm under icing conductor-breaking condition are studied.Firstly,the condition of breaking one or more conductorsare numerically calculated based on the location of the disconnection point.Then,the dynamic stress response characteristics of the composite crossarm under icing conductor-breaking conditionare discussed and compared with the stresscharacteristics under ice covered static load.Finally,the dynamic amplification coefficient is obtained to measure the impact of conductor broken.The result shows that the stress of key section on the cross arm increases to different extents and the root of the composite cross arm directly related to the position of the breakpoint is greatly affected when the conductor is broken,which should be considered in the design.The stress amplification coefficient of the critical section dangerous point on the cross arm after wire breaking is 1.1~1.3.The mutual influence between them is small when multiple conductors are broken at the same time.

关 键 词：复合横担 导线覆冰 断线 动力响应 有限元 应力分析 

分 类 号：TM21[一般工业技术—材料科学与工程]