高压输电塔的断线分析和断线张力计算
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摘要
针对高压输电塔的断线张力问题采用有限元方法(FEM)进行分析,建立输电塔、输电线以及地面的有限元模型.利用单元生死方法来模拟输电线的突然断裂,采用摩擦和接触来模拟跌落导线与地面的作用,获得输电塔线体系的断线响应和断线张力,并将断线张力结果与规范、文献中的方法进行比较.分析发现,当紧靠断线档的绝缘子摆幅达到最大时,输电线路的各种响应如绝缘子轴力、输电塔的顺线向剪力等几乎同时达到峰值.在只考虑静力作用的情况下,规范的断线张力数据大于有限元计算结果,基于曲线法的数据和计算结果非常接近;若考虑断线的动力冲击作用,则规范和曲线法的数据均比有限元结果小很多.
The finite element method(FEM) was employed to solve the broken wire problem of high voltage transmission tower.The finite element model including transmission tower,transmission line and the ground was conducted.The method using the death of cable element was used to simulate the sudden breaking of transmission line.The friction and contact were considered to simulate the interaction between the dropping wire and the ground.Then the responses of transmission tower-line system due to wire breakage were obtained and the broken wire loads were calculated.These broken wire loads were compared with the loads calculated from the codes and literatures.When the sway amplitude of insulator adjacent to the broken span reaches maximum,the responses of transmission line such as the axial force of insulator and along-line shear force of tower will reach their maximal values at the same time.If the static effect is considered,the broken wire loads obtained from codes are larger than the loads from FEM and the broken wire loads calculated based on the curve method and FEM are very close.If the dynamic impact effect is considered,the broken wire loads from codes and the curve method are much smaller than those from FEM.
The finite element method(FEM) was employed to solve the broken wire problem of high voltage transmission tower.The finite element model including transmission tower,transmission line and the ground was conducted.The method using the death of cable element was used to simulate the sudden breaking of transmission line.The friction and contact were considered to simulate the interaction between the dropping wire and the ground.Then the responses of transmission tower-line system due to wire breakage were obtained and the broken wire loads were calculated.These broken wire loads were compared with the loads calculated from the codes and literatures.When the sway amplitude of insulator adjacent to the broken span reaches maximum,the responses of transmission line such as the axial force of insulator and along-line shear force of tower will reach their maximal values at the same time.If the static effect is considered,the broken wire loads obtained from codes are larger than the loads from FEM and the broken wire loads calculated based on the curve method and FEM are very close.If the dynamic impact effect is considered,the broken wire loads from codes and the curve method are much smaller than those from FEM.
引文
[1]OSWALD B,SCHROEDER D,CATCHPOLE P.Investigative summery of the July 1993Nebraska PublicDistrict Grand Island:Moore 345kV transmission linefailure[C]∥Transmission and Distribution Conference,Proceedings of the 1994IEEE Power Engineering Society.Chicago:IEEE,1994:574-580.
[2]CAMPBELL D B.Unbalanced tensions in transmissionlines[J].Journal of the Structural Division,Proceedingof American Society of Civil Engineering,1970,96(ST10):2189-2207.
[3]MOZER J D,POHLMAN J C,FLEMING J F.Longi-tudinal load analysis of transmission line systems[J].IEEE Transactions on Power Apparatus and System,1977,PAS-96(5):1657-1664.
[4]THOMAS M B,PEYROT A H.Dynamic response ofruptured conductors in transmission lines[J].IEEETransactions on Power Apparatus and System,1982,PAS-101(9):3022-3027.
[5]SIDDIQUI F M A,FLEMING J F.Broken wire analy-sis of transmission line systems[J].Computer andStructures,1984,18(6):1077-1085.
[6]MCCLURE G,TINAWI R.Mathematical modeling ofthe transient response of electric transmission lines dueto conductor breakage[J].Computer and Structures,1987,26(1/2):41-56.
[7]MCCLURE G,LAPOINTE M.Modeling the structuraldynamic response of overhead transmission lines[J].Computer and Structures,2003,81(8-11):825-834.
[8]李黎,夏正春,江宜城,等.输电线断线振荡研究[J].工程力学,2008,25(6):165-169.LI Li,XIA Zheng-chun,JIANG Yi-cheng,et al.Studyon wire breaking-induced vibrations of electric transmissionline[J].Engineering Mechanics,2008,25(6):165-169.
[9]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.
[10]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.
[11]许建安.35～110kV输电线路设计[M].北京:中国水利水电出版社,2003:72-76.
[12]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.SHEN Guo-hui,HE Yun-xiang,SUN Bing-nan,et al.Dynamic effect on long-span transmission line system dueto insulator rupture[J].Journal of Zhejiang University:Engineering Science,2008,42(11):1990-1995.
[13]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.SHEN Guo-hui,SUN Bing-nan,HE Yun-xiang,et al.Research on earthquake effect of long-span transmis-sion tower-line system[J].Engineering Mechanics,2008,25(11):212-217.
[14]GB50168-92.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,1992.
[2]CAMPBELL D B.Unbalanced tensions in transmissionlines[J].Journal of the Structural Division,Proceedingof American Society of Civil Engineering,1970,96(ST10):2189-2207.
[3]MOZER J D,POHLMAN J C,FLEMING J F.Longi-tudinal load analysis of transmission line systems[J].IEEE Transactions on Power Apparatus and System,1977,PAS-96(5):1657-1664.
[4]THOMAS M B,PEYROT A H.Dynamic response ofruptured conductors in transmission lines[J].IEEETransactions on Power Apparatus and System,1982,PAS-101(9):3022-3027.
[5]SIDDIQUI F M A,FLEMING J F.Broken wire analy-sis of transmission line systems[J].Computer andStructures,1984,18(6):1077-1085.
[6]MCCLURE G,TINAWI R.Mathematical modeling ofthe transient response of electric transmission lines dueto conductor breakage[J].Computer and Structures,1987,26(1/2):41-56.
[7]MCCLURE G,LAPOINTE M.Modeling the structuraldynamic response of overhead transmission lines[J].Computer and Structures,2003,81(8-11):825-834.
[8]李黎,夏正春,江宜城,等.输电线断线振荡研究[J].工程力学,2008,25(6):165-169.LI Li,XIA Zheng-chun,JIANG Yi-cheng,et al.Studyon wire breaking-induced vibrations of electric transmissionline[J].Engineering Mechanics,2008,25(6):165-169.
[9]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.
[10]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.
[11]许建安.35～110kV输电线路设计[M].北京:中国水利水电出版社,2003:72-76.
[12]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.SHEN Guo-hui,HE Yun-xiang,SUN Bing-nan,et al.Dynamic effect on long-span transmission line system dueto insulator rupture[J].Journal of Zhejiang University:Engineering Science,2008,42(11):1990-1995.
[13]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.SHEN Guo-hui,SUN Bing-nan,HE Yun-xiang,et al.Research on earthquake effect of long-span transmis-sion tower-line system[J].Engineering Mechanics,2008,25(11):212-217.
[14]GB50168-92.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,1992.
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