输电导线悬挂点处等效风荷载仿真分析
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摘要
在实际的输电线路中,导线悬挂点处的等效风荷载直接影响着绝缘子串风偏角,其大小与绝缘子串的不同悬挂方式和通过风压不均匀系数折算出的整档导线风荷载有关。为此,首先建立了两档导线有限元模型,仿真分析了绝缘子串的不同悬挂方式对导线悬挂点处的风荷载影响,然后通过在导线上不同位置施加稳态风和选取不同的风压不均匀系数来研究风压不均匀系数折算方法对导线悬挂点处风荷载的影响。研究发现:当稳态风风速为30m/s,且集中作用在导线悬挂点两端附近时,导线悬挂点处的风荷载与设计规范的风荷载差异率达到38.69%,该结果可以部分说明即使导线高度处的实际风速没有超过其设计风速,线路仍有可能会发生风偏跳闸。
In actual operation of transmission line,the equivalent wind loads on two hanging points of a conductor have a direct impact on the insulator string windage yaw angle,and are related with the different hanging types of insulator strings and the wind load of whole conductor converted by the wind pressure asymmetric coefficient.We established a finite element model of two cross conductors,analyzed the influence of different insulator strings hanging types on the conductor hanging points,and studied the influence of wind load on the two conductor hanging points by flowing steady wind on the different locations of the conductor by choosing the different wind pressure asymmetric coefficient.The conclusion can be drawn that,when the steady wind speed is 30 m/s and blows intensively on the ends of the conductor hanging point,difference in rates of wind load between the two conductor hanging points and design specifications is 38.69%.The result can explain why windage yaw may trip although the actual wind speed does not exceed the design wind speed.
In actual operation of transmission line,the equivalent wind loads on two hanging points of a conductor have a direct impact on the insulator string windage yaw angle,and are related with the different hanging types of insulator strings and the wind load of whole conductor converted by the wind pressure asymmetric coefficient.We established a finite element model of two cross conductors,analyzed the influence of different insulator strings hanging types on the conductor hanging points,and studied the influence of wind load on the two conductor hanging points by flowing steady wind on the different locations of the conductor by choosing the different wind pressure asymmetric coefficient.The conclusion can be drawn that,when the steady wind speed is 30 m/s and blows intensively on the ends of the conductor hanging point,difference in rates of wind load between the two conductor hanging points and design specifications is 38.69%.The result can explain why windage yaw may trip although the actual wind speed does not exceed the design wind speed.
引文
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[16]GB50545-2010110～750kV架空输电线路设计规范[S],2010.GB50545-2010Code for design of110～750kV overhead transmission line[S],2010.
[17]孔德怡,李黎.悬垂绝缘子串动态风偏角有限元分析[J].电力建设,2008,29(9):5-9.KONG Deyi,LI Li.Finite element analysis of dynamic windage angle of suspended insulator strings[J].Electric Power Con-struction,2008,29(9):5-9.
[18]郑佳艳.动态风作用下悬垂绝缘子串风偏计算研究[D].重庆:重庆大学,2006.ZHENG Jiayan.Study on computation methods of windage of suspension insulator strings under dynamic wind loads[D].Chongqing,China:Chongqing University,2006.
[19]孙宝强,侯镭,孟晓波.不同风速下导线风偏动力响应分析[J].高电压技术,2010,36(11):2808-2813.SUN Baoqiang,HOU Lei,MENG Xiaobo.Characteristics a-nalysis of conductors displacement under different wind speeds[J].High Voltage Engineering,2010,36(11):2808-2813.
[20]朱宽军,邱玉贤,李新民,等.安装相间间隔棒的输电线防风偏设计有限元分析[J].高电压技术,2010,36(4):1038-1043.ZHU Kuanjun,QIU Yuxian,LI Xinmin,et al.Analysis of o-verhead transmission line for asynchronous swaying by the fi-nite element method[J].High Voltage Engineering,2010,36(4):1038-1043.
[21]王新敏.ANSYS工程结构数值分析[M].北京:人民交通出版社,2007.WANG Xinmin.ANSYS engineering structure numerical anal-ysis[M].Beijing,China:China Communication Press,2007.
[22]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,2003,23(6):63-69.LIANG Shuguo,ZHU Jihua,WANG Lizheng.Analysis of dy-namic characters of electrical transmission tower-line system with a big span[J].Earthquake Engineering and Engineering Vibration,2003,23(6):63-69.
[23]邵天晓.架空送电线路的电线力学计算[M].2版.北京:中国电力出版社,2003.SHAO Tianxiao.Mechanics calculation of overhead transmis-sion lines[M].2nd ed.Beijing,China:China Electric Power,Press,2003.
[2]梁正平,王乘.特高压架空输电线微风振动影响因素分析[J].水电能源科学,2008,26(3):185-188,204.LIANG Zhengping,WANG Cheng.Analysis of aeolian vibration influence factors on UHV transmission conductor[J].Water Resources and Power,2008,26(3):185-188,204.
[3]Dhotarad M S,Ganesan N,Rao B V.Transmission line vibration[J].Journal of Sound and Vibration,1978,60(2):217-237.
[4]Claren R,Diana G.Mathematical analysis of transmission line vibration[J].IEEE Transactions on Power Apparatus and Sys-tems,1969,88(12):1741-1771.
[5]Schmidt J T,Biedenbach G,Krispin H J.Laboratory measure-ment of the power dissipation characteristics of Aeolian vibration danpers[J].IEEE Transactions on Power Delivery,1997,12(4):1614-1621.
[6]李欣业,张华彪,侯书军.覆冰输电导线舞动的仿真分析[J].振动工程学报,2010,23(1):76-85.LI Xinye,ZHANG Huabiao,HOU Shujun.Theoretical and nu-merical analysis of galloping of iced power transmission lines[J].Journal of Vibration Engineering,2010,23(1):76-85.
[7]Gupta S,Wipf T,Fanous F.Structural failure analysis of 345kV transmission line[J].IEEE Transactions on Power De-livery,1994,9(2):894-903.
[8]Desai Y M,Yu P,Popplewell N,et al.Finite element modeling of transmission line galloping[J].Computers&Structures,1995,57(3):407-420.
[9]胡毅.500kV输电线路风偏跳闸的分析研究[J].高电压技术,2004,30(8):9-10.HU Yi.Study on trip caused by windage yaw of500kV trans-mission lines[J].High Voltage Engineering,2004,30(8):9-10.
[10]Loredo-Souza A M,Davebport A G.The effects of high winds on transmission lines[J].Journal of Wind Engineering and In-dustrial Aerodynamics,1998,74/76:987-994.
[11]东北电力设计院.电力工程高压送电线路设计手册[M].北京:水利电力出版社,1992.North East Electric Power Design Institute.Power engineering high-voltage transmission line design[M].Beijing,China:Chi-na Water Power Press,1992.
[12]DL/T5092-1999110～500kV架空送电线路设计技术规程[S],1999.DL/T5092-1999Technical code for designing110～500kV overhead transmission line[S],1999.
[13]DL/T620-1997交流电气装置的过电压保护和绝缘配合[S],1997.DL/T620-1997Overvoltage protection and insulation coordi-nation for AC electrical installations[S],1997.
[14]胡毅.输电线路运行故障分析与防治[M].北京:中国电力出版社,2007:16-17.HU Yi.Analysis and countermeasures on operation faults of transmission lines[M].Beijing,China:China Electric Power Press,2007:16-17.
[15]徐小东,王钢.关于风压不均匀系数的研究[J].电力建设,2007,28(7):1-4.XU Xiaodong,WANG Gang.Research on wind pressure asym-metric coefficient[J].Electric Power Construction,2007,28(7):1-4.
[16]GB50545-2010110～750kV架空输电线路设计规范[S],2010.GB50545-2010Code for design of110～750kV overhead transmission line[S],2010.
[17]孔德怡,李黎.悬垂绝缘子串动态风偏角有限元分析[J].电力建设,2008,29(9):5-9.KONG Deyi,LI Li.Finite element analysis of dynamic windage angle of suspended insulator strings[J].Electric Power Con-struction,2008,29(9):5-9.
[18]郑佳艳.动态风作用下悬垂绝缘子串风偏计算研究[D].重庆:重庆大学,2006.ZHENG Jiayan.Study on computation methods of windage of suspension insulator strings under dynamic wind loads[D].Chongqing,China:Chongqing University,2006.
[19]孙宝强,侯镭,孟晓波.不同风速下导线风偏动力响应分析[J].高电压技术,2010,36(11):2808-2813.SUN Baoqiang,HOU Lei,MENG Xiaobo.Characteristics a-nalysis of conductors displacement under different wind speeds[J].High Voltage Engineering,2010,36(11):2808-2813.
[20]朱宽军,邱玉贤,李新民,等.安装相间间隔棒的输电线防风偏设计有限元分析[J].高电压技术,2010,36(4):1038-1043.ZHU Kuanjun,QIU Yuxian,LI Xinmin,et al.Analysis of o-verhead transmission line for asynchronous swaying by the fi-nite element method[J].High Voltage Engineering,2010,36(4):1038-1043.
[21]王新敏.ANSYS工程结构数值分析[M].北京:人民交通出版社,2007.WANG Xinmin.ANSYS engineering structure numerical anal-ysis[M].Beijing,China:China Communication Press,2007.
[22]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,2003,23(6):63-69.LIANG Shuguo,ZHU Jihua,WANG Lizheng.Analysis of dy-namic characters of electrical transmission tower-line system with a big span[J].Earthquake Engineering and Engineering Vibration,2003,23(6):63-69.
[23]邵天晓.架空送电线路的电线力学计算[M].2版.北京:中国电力出版社,2003.SHAO Tianxiao.Mechanics calculation of overhead transmis-sion lines[M].2nd ed.Beijing,China:China Electric Power,Press,2003.
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