自立式双回路铁塔送电线路导线断裂后的结构动响应分析
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摘要
为了研究机械性故障对自立式双回路铁塔输电线路结构的受力影响,建立了500 kV架空输电线路耐张段的耦合体系模型,采用瞬态动力分析方法计算了高压交流输电线路耐张段一基塔在发生上横档一组导线突然断裂破坏后,邻近破坏处的导线、绝缘子、塔构件的瞬态动响应变化规律。分析结果表明,上横担一组导线断裂失效对邻近端导线张力峰值没有明显影响,对邻近端的绝缘子及铁塔横担构件的受力有较大的影响。研究成果可为输电线路结构设计提供理论依据。
In order to study the dynamic response of high voltage transmission lines with self-supporting double-loop steel towers under mechanical faults, the non-linear dynamic finite element model of a domestic 500kV high voltage transmission line system was established. The reliability of coupled system model was verified by static calculation results. Transient dynamic analysis method was proposed to analyze the varying state of dynamic response under cable rupture. The results show that upper crossarm cable rupture has no effect on cable tension at adjacent suspension points, but it has significant influence on tension in the insulator and in the tower components of upper crossarm next to the broken span. The research results can provide a theoretical base for the design of transmission lines.
In order to study the dynamic response of high voltage transmission lines with self-supporting double-loop steel towers under mechanical faults, the non-linear dynamic finite element model of a domestic 500kV high voltage transmission line system was established. The reliability of coupled system model was verified by static calculation results. Transient dynamic analysis method was proposed to analyze the varying state of dynamic response under cable rupture. The results show that upper crossarm cable rupture has no effect on cable tension at adjacent suspension points, but it has significant influence on tension in the insulator and in the tower components of upper crossarm next to the broken span. The research results can provide a theoretical base for the design of transmission lines.
引文
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[2]DL/T5154-2002.架空送电线路杆塔结构设计技术规定[S].中国电力出版社,2002.
[3]Siddiqui FMA.Dynamic analysis and behavior of electrictransmission line systems subjected to broken wires[D],PhD thesis,University of Pittsburgh,Pittsburgh,PA,1981.
[4]McClure G,Tinawi R.Mathematical modeling of the transientresponse of electric transmission lines due to conductor break-age[J].Computers and Structures,1987,26(1/2):41-56.
[5]Ostendorp M.Longitudinal load and cascading failure risk as-sessment(CASE)[R].Vol.1 Simplified approach.EPRIReport TR-107087-V1,Electric Power Research Institute,Palo Alto,CA,1997.
[6]Ostendorp M.Longitudinal load and cascading failure riskassessment(CASE)[R].Vol.2 Advanced methods.EPRIReport TR-107087-V2,Electric Power Research Institute,Palo Alto,CA,1997.
[7]Kempner Jr L.Longitudinal impact loading on electrical trans-mission line towers-A scale model study[D],PhD thesis,Portland State University,Portland,OR,1997.
[8]梁枢果,朱继华,王力争.大跨越输电塔-线体系动力特性分析[J].地震工程与工程振动,2003,26(3):63-69.
[9]梁峰,李黎,尹鹏.大跨越输电塔-线体系数值分析模型的研究[J].振动与冲击,2007,26(2):61-65.
[10]赵滇生,金三爱.有限元模型对输电塔架结构动力特性分析的影响[J].特种结构,2004,21(3):8-11.
[11]石文龙,李宏男,贾连光.输电塔-导线耦联体系模型的振动台试验研究[J].工程力学,2006,23(5):89-93.
[12]陈亦.大跨越输电线路塔体系风振响应及控制[D].上海:同济大学,2003.
[13]Adeli H,Zhang J.Fully nonlinear analysis of composite gird-er cable-stayed bridges[J].Computers and Structures,1995,54(2):267-277.
[14]刘磊,张光卿,袁长卿.杆系结构的高精度非线性分析[J].土木工程学报,2006,39(1):25-28.
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