绝缘子断裂对大跨越输电线路的动力效应
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摘要
输电线路中的绝缘子由于外界多种因素作用可能会发生断裂,致使导线跌落,在导线下落过程中将对输电线路产生持续的动力冲击作用.以某大跨越输电塔为例,采用有限元方法建立了塔线模型,并对导线的跌落过程进行模拟.导线在自由跌落过程中存在明显的回弹,动力效应显著,部分杆件如挂线杆将产生较大的峰值应力,关于中轴面对称的杆件将产生摇摆效应.与地面接触的导线在跌落过程中也存在导线回弹现象,构件内力与导线自由跌落时相差不多.从能量角度解析了这两种导线跌落过程,并通过对比验证了导线跌落模拟的准确性.
The insulator on transmission line may rupture due to multiple exterior actions,resulting in dropping of conduct.During the conduct dropping process,the transmission tower line system will receive continuous dynamic impacts.Taking a long-span transmission tower as example,finite element method was employed to construct a tower-line model and simulate the conduct dropping process.In the process of free dropping,the conduct rebounds,and part of structural members such as tilted-braced members expose to high peak stresses.And two structural members symmetrical to the central axis plane behave as swaying effect.The rebound of conduct and similar stresses on the structural components are also found during the conduct dropping process after considering the impinging action between conduct and ground.The two dropping processes were also studied comparatively from view of energy,and the simulation methods of the two dropping processes were verified.
The insulator on transmission line may rupture due to multiple exterior actions,resulting in dropping of conduct.During the conduct dropping process,the transmission tower line system will receive continuous dynamic impacts.Taking a long-span transmission tower as example,finite element method was employed to construct a tower-line model and simulate the conduct dropping process.In the process of free dropping,the conduct rebounds,and part of structural members such as tilted-braced members expose to high peak stresses.And two structural members symmetrical to the central axis plane behave as swaying effect.The rebound of conduct and similar stresses on the structural components are also found during the conduct dropping process after considering the impinging action between conduct and ground.The two dropping processes were also studied comparatively from view of energy,and the simulation methods of the two dropping processes were verified.
引文
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[10]ABAQUS 6.4.Theory manual[M].Pawtucket:Abaqus Inc.,2003.
[2]包建强,吴明祥.500kV进口合成绝缘子断裂原因分析[J].电力设备,2004,5(3):49-52.BAO Jian-qiang,WU Ming-xiang.Reason analysis ofbreakage for imported 500kV composite insulator[J].Electrical Equipment,2004,5(3):49-52.
[3]刘恢先.唐山大地震震害[M].北京:地震出版社,1989.
[4]尹荣华,李东亮,刘戈林,等.高压输电塔震害及抗震研究[J].世界地震工程,2005,21(1):51-54.YIN Rong-hua,LI Dong-liang,LIU Ge-lin,et al.Seis-mic damage and analysis of power transmissions towers[J].World Information on Earthquake Engineering,2005,21(1):51-54.
[5]DL/T 5092-1999,110~500kV架空送电线路设计技术规程[S].北京:中国电力出版社,1999.
[6]DL/T 5154-2002,架空送电线路杆塔结构设计技术规定[S].北京:中国电力出版社,2002.
[7]CHEN W H,YEH J T.Three-dimensional finite ele-ment analysis of static and dynamic contact problemswith friction[J].Computers and Structures,1990,35(5):541-552.
[8]刘书,刘晶波,方鄂华.动接触问题及其数值模拟的研究进展[J].工程力学,1999,16(6):14-28.LIU Shu,LIU Jing-bo,FANG E-hua.The advances ofstudies on the dynamic contact problem and its numericalmethods[J].Engineering Mechanics,1999,16(6):14-28.
[9]GB50171-92,电气装置安装工程旋转电机施工及验收规范[S].北京:中国计划出版社,1993.
[10]ABAQUS 6.4.Theory manual[M].Pawtucket:Abaqus Inc.,2003.
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