750 kV LGJK300/50扩径导线的有限元建模及模态分析（英文）
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摘要
超高压扩径导线750 kVLGJK300/50型,因模型中股线间的接触为强非线性的点、线接触,参考相关有限元建模文献,很难找到理想的方法得到成功的有限元模型。针对这个难点,经过加大股线尺寸6～10个丝,改善原有的有限元模型,并对其进行模态仿真。模态仿真结果较之前的模型更优,更贴近实际。模态仿真结果显示,扩径导线在工程使用中的模态振型,主要以弯扭变形模态为主。当模型长度较短时,发生微风振动的几率较高,导线长度逐渐增加,次档距震荡会凸显,若无间隔棒,导线长度再逐渐增加时,则具有破坏性质的舞动随之而来,这与工程实际运行情况相符。
As far as the ultrahigh pressure expanded diameter conductor for 750 kV LGJK300/50 type is concerned,since the contact between the small strands of wire in the model are strong nonlinear point or line contact,it is difficult to find an ideal method to obtain a successful finite element model in the present literature. This paper enlarged the size of small strands of wire to 6-10 silk and tried to solve this problem. The original finite element model has been improved and the numerical simulation was carried out. The simulation results show that the present model is better than previous models,and the vibration mode of the expanded diameter conductor in engineering is mainly based on the bending and torsion deformation mode. When the model length is relatively short,the chance of breeze vibration becomes higher; when the length of model wire gets increased gradually,subspan oscillation will be highlighted,without spacing rod and the length of the wire increases gradually,and the destructive dancing follows. These are consistent with the actual operation of the project.
As far as the ultrahigh pressure expanded diameter conductor for 750 kV LGJK300/50 type is concerned,since the contact between the small strands of wire in the model are strong nonlinear point or line contact,it is difficult to find an ideal method to obtain a successful finite element model in the present literature. This paper enlarged the size of small strands of wire to 6-10 silk and tried to solve this problem. The original finite element model has been improved and the numerical simulation was carried out. The simulation results show that the present model is better than previous models,and the vibration mode of the expanded diameter conductor in engineering is mainly based on the bending and torsion deformation mode. When the model length is relatively short,the chance of breeze vibration becomes higher; when the length of model wire gets increased gradually,subspan oscillation will be highlighted,without spacing rod and the length of the wire increases gradually,and the destructive dancing follows. These are consistent with the actual operation of the project.
引文
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[13]WANG L M,SUN B Q,ZHANG C Y,et al.Mechanical Analysis and Calculation of Interphase Bars for 750 k V Compact Lines[J].High Voltage Engineering,2014,35(10):2551-2556.
[2]ZHENG Q.Mechanism and Suppression Measures for Secondary Span Oscillation of Split Wires of 750kV Lines[J].Ningxia Electric Power,2010,1(3):20-22.
[3]CHEN M L,ZHANG Q.The design points of 720K900Z diameter expanding conductors[J].Shaanxi University of Technology,2015,(5):11-14.
[4]WAN J C,LIU Y,SUN B D,et al.Classification of expanding conductors and choice of expanding method[J].Electric Power Construction,2010,31(6):113-118.
[5]YE Z X.Research on Control of Breeze Vibration and Subspan Oscillation of Transmission Lines[D].Wuhan:Huazhong University of Science and Technology,2009.
[6]JI S Z.Development trend of IEC overhead transmission conductor standard[J].Wire and Cable,2007,(3):1-4.
[7]YAN B,CAI M Q,LU X,et al.Study on the numerica simulation of the vibration of the wake with four-cutters[J].Journal of Vibration and Shock,2015(1):182-189.
[8]ZHANG C S,LIU B.Drawing and Stranding Process of Profiles[J].Wire and Cable,2016(2):19-20.
[9]ZHONG L M,GAO Y B,RUAN J C,et al.ANSYS finite element analysis method for ice-splitting and split-wire galloping[J].Science and Technology Information,2014(32):63-66.
[10]HE W,ZHAO G B.Finite element calculation of free vibration of split conductors installed anti-vibration hammer[J].Engineering Mechanics,2003,20(1):101-105.
[11]LI Y P,HUANG Z Y,et al.Calculation of the comprehensive elastic coefficient of composite large-gauge conductor made of steel and aluminum strands[J].Hydroelectric Energy,2012,30(2):180-182.
[12]FENG Y C,LI Y G,DUN L B,et al.Summarization of operation of 750 k V expanding conductors[J].Electric Power Construction,2007,28(10):43-46.
[13]WANG L M,SUN B Q,ZHANG C Y,et al.Mechanical Analysis and Calculation of Interphase Bars for 750 k V Compact Lines[J].High Voltage Engineering,2014,35(10):2551-2556.
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