输电塔在线路断线作用下的动力响应
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摘要
目前采用的拟静力法考虑线路的断线不平衡张力不能反映出输电塔受到的断线动力响应。针对这一问题,利用有限元程序ANSYS/LS-DYNA,建立导地线模型和以等效弹簧代替导地线对输电塔作用的塔-弹簧模型,将导地线模在断线作用下悬垂点的支座反力反向施加在塔-弹簧模型上,数值仿真了输电塔在导地线断线作用下的动态响应。研究表明,线路断线对输电塔的动力效应不可忽视。
At present the imbalance tension of suddenly ruptured wire is asually calculated approximately with pseudo-static method, which could not indicate the dynamic response of tower under the case of broken wire.To solve the problem, electric wires and tower-spring models are established respectively by use of ANSYS/LS-DYNA. The action of transmission lines to tower is substituted with equivalent spring in tower-spring model. In ground wire and conductor wire models the dynamic force at overhung point under the action of ruptured wire is taken as shock excitation load, then the dynamic responses of tower can be obtained by finite element calculation. Results show that dynamic effection of transmission tower induced by broken wires cannot be ignored.
At present the imbalance tension of suddenly ruptured wire is asually calculated approximately with pseudo-static method, which could not indicate the dynamic response of tower under the case of broken wire.To solve the problem, electric wires and tower-spring models are established respectively by use of ANSYS/LS-DYNA. The action of transmission lines to tower is substituted with equivalent spring in tower-spring model. In ground wire and conductor wire models the dynamic force at overhung point under the action of ruptured wire is taken as shock excitation load, then the dynamic responses of tower can be obtained by finite element calculation. Results show that dynamic effection of transmission tower induced by broken wires cannot be ignored.
引文
[1]Mozer J D,Pohlman Joe C,Fleming,John F.Longitudinal load analysis of transmission line systems[J].IEEE Trans Power Appar Syst PAS,1977,96(5):1657—1665.
[2]Peyrot A H,Kluge Robert O,Lee Jun W.Longitudinal loads from broken conductors and broken insulators and their effect on transmission lines[J].IEEE transactions on power appa-ratus and systems,1980,99(1):222—234.
[3]Mozer J D,Wood William A,Hribar John A.Broken wire tests on a model transmission line system[J].IEEE transac-tions on power apparatus and systems,1981,100(3):938—947.
[4]Thomas MB P A.Dynamic response of ruptured conductors in transmission lines[J].IEEE Trans Power Appar Syst PAS,1982,101(9):3022—3027.
[5]Siddiqui F M A,Fleming,John F.Broken Wire Analysis of Transmission Line Systems[J].Computers and Structures,1984,18(6):1077—1085.
[6]邓洪洲,朱松晔.大跨越输电塔线体系风振控制研究[J].建筑结构学报,2003,(4):60—65.
[7]黄斌,唐家祥.大跨越输电塔结构风振控制[J].噪声与振动控制,1997,(5):2—5.
[8]岳茂光.近断层地震动作用下输电塔-导线体系反应分析[J].地震工程与工程振动,2005,25(4):116—125.
[9]李宏男.导线对输电塔体系纵向振动的影响界限及简化抗震计算方法[J].振动与冲击,2004,23(2):1—7.
[10]邵天晓.空中送电线路的电线力学计算[M].北京:中国电力出版社,2003.
[11]尚晓江,苏建宇.ANSYS/LS-DYNA动力分析方法与工程实例[M].北京:中国水利水电出版社,2006.
[2]Peyrot A H,Kluge Robert O,Lee Jun W.Longitudinal loads from broken conductors and broken insulators and their effect on transmission lines[J].IEEE transactions on power appa-ratus and systems,1980,99(1):222—234.
[3]Mozer J D,Wood William A,Hribar John A.Broken wire tests on a model transmission line system[J].IEEE transac-tions on power apparatus and systems,1981,100(3):938—947.
[4]Thomas MB P A.Dynamic response of ruptured conductors in transmission lines[J].IEEE Trans Power Appar Syst PAS,1982,101(9):3022—3027.
[5]Siddiqui F M A,Fleming,John F.Broken Wire Analysis of Transmission Line Systems[J].Computers and Structures,1984,18(6):1077—1085.
[6]邓洪洲,朱松晔.大跨越输电塔线体系风振控制研究[J].建筑结构学报,2003,(4):60—65.
[7]黄斌,唐家祥.大跨越输电塔结构风振控制[J].噪声与振动控制,1997,(5):2—5.
[8]岳茂光.近断层地震动作用下输电塔-导线体系反应分析[J].地震工程与工程振动,2005,25(4):116—125.
[9]李宏男.导线对输电塔体系纵向振动的影响界限及简化抗震计算方法[J].振动与冲击,2004,23(2):1—7.
[10]邵天晓.空中送电线路的电线力学计算[M].北京:中国电力出版社,2003.
[11]尚晓江,苏建宇.ANSYS/LS-DYNA动力分析方法与工程实例[M].北京:中国水利水电出版社,2006.
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