突然断线对输电塔线体系的冲击作用研究
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摘要
突然断线使处于绷紧状态的输电线张力迅速释放,塔线体系将受到动力冲击作用,但设计规范仅按静态荷载来考虑断线荷载。以某输电线路为例,采用有限元方法建立塔线体系模型,进行断一根至六根子导线工况的模拟,并考虑跌落导线与地面的碰撞。分析发现,断子导线的根数越多,或者越接近断线点,直线塔绝缘子的摆动幅度越大,峰值轴力也越大。导线断线将产生两个极大的冲击作用,一个是导线断裂产生的冲击,另一个是跌落导线与地面碰撞产生的冲击。
The sudden breakage of conductor enables the quick release of tension in conductor,which causes the dynamic impact effect on transmission line system.However,the design codes of transmission towers usually consider conductor breakage load as static load.Taking a transmission line system as example,finite element method was employed to construct the tower-line model.In calculation,the cases of one sub-conductor breakage to six sub-conductors breakage were simulated and the impinging of dropping conductors against ground was considered.The conclusions show that the bigger the number of broken sub-conductors is or the closer the broken point is to the insulator,the larger the swing amplitudes and the peak axial forces on insulators of tangent towers will be.The breakage of conductors will result in two major impacts: the one is induced directly by the sudden breakage of conductors and the other is induced by impinging of dropping conductors against ground.
The sudden breakage of conductor enables the quick release of tension in conductor,which causes the dynamic impact effect on transmission line system.However,the design codes of transmission towers usually consider conductor breakage load as static load.Taking a transmission line system as example,finite element method was employed to construct the tower-line model.In calculation,the cases of one sub-conductor breakage to six sub-conductors breakage were simulated and the impinging of dropping conductors against ground was considered.The conclusions show that the bigger the number of broken sub-conductors is or the closer the broken point is to the insulator,the larger the swing amplitudes and the peak axial forces on insulators of tangent towers will be.The breakage of conductors will result in two major impacts: the one is induced directly by the sudden breakage of conductors and the other is induced by impinging of dropping conductors against ground.
引文
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[7]Faruq M A Siddiqui,John F.Fleming.Broken wire analysisof transmission line systems[J].Computer and Structures,1984,18(6):1077-1085.
[8]McClure G,Tinawi R.Mathematical Modeling of the transientresponse of electric transmission lines due to conductor break-age[J].Computer and Structures,1987,26(1/2):41-56.
[9]McClure G,Lapointe M.Modeling the structural dynamic re-sponse of overhead transmission lines[J].Computer andStructures,2003,81:825-834.
[10]夏正春,李黎,梁政平,等.输电塔在线路断线作用下的动力响应[J].振动与冲击,2007,26(11):45-49.
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[13]沈国辉,何运祥,孙炳楠,等.绝缘子断裂对大跨越输电塔的动力效应[J],浙江大学学报工学版,2008,42(11):1990-1995.
[14]沈国辉,孙炳楠,何运祥,等.大跨越输电塔线体系的地震响应研究[J].工程力学,2008,25(11):212-217.
[15]沈国辉,孙炳楠,张陈胜.直流线路断线荷载影响的模拟计算报告[R].浙江大学土木系,2007.
[2]DL/T5092-1999,110~500 kV架空送电线路设计技术规程[S].北京:中国电力出版社,1999.
[3]DL/T5154-2002,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.
[4]David B.Campbell.Unbalanced tensions in transmissionlines[J].Journal of the Structural Division,Proceeding of A-merican Society of Civil Engineering,1970,96(ST10):2189-2207.
[5]John D.Mozer,Joe C.Pohlman,John F.Fleming.Longitu-dinal load analysis of transmission line systems[J].IEEETransactions on Power Apparatus and System,1977,PAS-96(5):1657-1664.
[6]Thomas MB,Peyrot AH.Dynamic response of ruptured con-ductors in transmission lines[J].IEEE Transactions on Pow-er Apparatus and System,1982,PAS-101(9):3022-3027.
[7]Faruq M A Siddiqui,John F.Fleming.Broken wire analysisof transmission line systems[J].Computer and Structures,1984,18(6):1077-1085.
[8]McClure G,Tinawi R.Mathematical Modeling of the transientresponse of electric transmission lines due to conductor break-age[J].Computer and Structures,1987,26(1/2):41-56.
[9]McClure G,Lapointe M.Modeling the structural dynamic re-sponse of overhead transmission lines[J].Computer andStructures,2003,81:825-834.
[10]夏正春,李黎,梁政平,等.输电塔在线路断线作用下的动力响应[J].振动与冲击,2007,26(11):45-49.
[11]ABAQUS 6.4,Theory Manual[M].Abaqus Inc.2003.
[12]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.
[13]沈国辉,何运祥,孙炳楠,等.绝缘子断裂对大跨越输电塔的动力效应[J],浙江大学学报工学版,2008,42(11):1990-1995.
[14]沈国辉,孙炳楠,何运祥,等.大跨越输电塔线体系的地震响应研究[J].工程力学,2008,25(11):212-217.
[15]沈国辉,孙炳楠,张陈胜.直流线路断线荷载影响的模拟计算报告[R].浙江大学土木系,2007.
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