大风条件下500 kV紧凑型线路复合绝缘子V型串的屈曲特性
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摘要
V型串是紧凑型线路中的关键部件,起着悬挂导线并控制安全距离的作用。大风条件下,导线风偏程度过大会使V型串发生屈曲变形而引发屈曲断裂,研究风偏工况下V型串的力学特性很重要。针对云南某500kV输电线路,首先使用目前常用的静力平衡法计算了稳态风和脉动风作用下V型串绝缘子的最大屈曲应力。然后利用清华大学自主研发的导线动力系统仿真软件,计算了脉动风和冲击风荷载作用下绝缘子的屈曲应力动态变化过程,并且比较了稳态风、脉动风、冲击风作用下的最大屈曲应力值,得到脉动风和冲击风作用下应力极值的放大系数分别为1.2和1.6～2.6。最后考虑冲击风作用下的导线风偏,计算了线路使用不同V串夹角和不同芯棒直径时的屈曲应力极值,结果证明采用夹角100°以及采用直径24 mm的绝缘子是安全的,并提出采用直径24 mm的芯棒双V串的新方案。最后利用软件ANSYS搭建实体仿真,讨论了高压端连接转动自由度对绝缘子屈曲应力分布的影响,得到应力放大系数为1.0～1.3。
As a key component in compact transmission line, V-type string plays a role of hanging conductor and controlling safe distance. V-type string will swing with the wind and suffer large buckling deformation under strong wind.Thus, it is particularly important to study its mechanical properties under gale circumstance. We studied the V-string for a500 kV compact transmission line of Yunnan. Firstly, using the method of static equilibrium, we calculated the maximum buckling stress of insulator under steady wind and pulsating wind. Then the dynamic buckling response of the V-type insulators was obtained by simulating the wind swinging response of compact transmission line under pulsating wind and impulse wind load after using the three-degree-of-freedom nonlinear mechanical software developed by Tsinghua University. The extreme buckling stress of the V-type insulator under the action of steady wind, pulsating wind and impulse wind was respectively compared, and amplification factors under the latter two wind loads were obtained as 1.2 and 1.6～2.6.Moreover,in consideration of the effect of impulse wind, the buckling response of insulator was obtained when insulators of different V-angle and different diameters were adopted. The results show that it is safe to use V-type strings with angle of 100° and insulators with 24-mm diameter. Moreover, we put forward a design scheme of 24 mm-diameter rod double V-type string for anti-buckling-fracture. Finally, the software ANSYS is used to discuss the influence of the connection degree of freedom of the connection of the high voltage end on the buckling stress distribution of the insulator, and the stress value amplification factor of 1.0～1.3 is obtained.
As a key component in compact transmission line, V-type string plays a role of hanging conductor and controlling safe distance. V-type string will swing with the wind and suffer large buckling deformation under strong wind.Thus, it is particularly important to study its mechanical properties under gale circumstance. We studied the V-string for a500 kV compact transmission line of Yunnan. Firstly, using the method of static equilibrium, we calculated the maximum buckling stress of insulator under steady wind and pulsating wind. Then the dynamic buckling response of the V-type insulators was obtained by simulating the wind swinging response of compact transmission line under pulsating wind and impulse wind load after using the three-degree-of-freedom nonlinear mechanical software developed by Tsinghua University. The extreme buckling stress of the V-type insulator under the action of steady wind, pulsating wind and impulse wind was respectively compared, and amplification factors under the latter two wind loads were obtained as 1.2 and 1.6～2.6.Moreover,in consideration of the effect of impulse wind, the buckling response of insulator was obtained when insulators of different V-angle and different diameters were adopted. The results show that it is safe to use V-type strings with angle of 100° and insulators with 24-mm diameter. Moreover, we put forward a design scheme of 24 mm-diameter rod double V-type string for anti-buckling-fracture. Finally, the software ANSYS is used to discuss the influence of the connection degree of freedom of the connection of the high voltage end on the buckling stress distribution of the insulator, and the stress value amplification factor of 1.0～1.3 is obtained.
引文
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[11]王超.考虑地形影响的雷暴冲击风场特性研究[D].重庆:重庆大学,2015.WANG Chao.Wind field characteristics of downburst flow over topography[D].Chongqing,China:Chongqing University,2015.
[12]傅观君,王黎明,侯镭,等.±800 kV特高压直流耐张串应用复合绝缘子的可行性[J].中国电机工程学报,2011,31(22):119-125.FU Guangjun,WANG Liming,HOU Lei,et al.Feasibility of application of composite insulators in±800 k V UHV DC tension strings[J].Proceedings of the CSEE,2011,31(22):119-125.
[13]王黎明,曹露,梅红伟,等.1 000 kV特高压交流紧凑型输电线路综合工况下间隔棒抑制效果仿真研究[J].高电压技术,2017,43(11):3661-3667.WANG Liming,CAO Lu,MEI Hongwei,et al.Simulation research on the suppression effect of spacers on 1 000 k V UHV AC compact transmission lines under comprehensive conditions[J].High Voltage Engineering,2017,43(11):3661-3667..
[14]傅观君,王黎明,侯镭,等.大吨位复合绝缘子在特高压直流V型串上的应用[J].高电压技术,2011,37(3):658-665.FU Guanjun,WANG Liming,HOU Lei,et al.Application of long tonnage composite insulators on UHVDC V-type strings[J].High Voltage Engineering,2011,37(3):658-665.
[15]SUN B Q,HOU L,ZHANG C Y,et al.Extreme bending of composite insulators on 750 k V compact transmission lines[J].IEEE Transmissions on Dielectrics and Electrical Insulation,2010,17(6):1781-1786.
[16]乐波,侯镭,王黎明,等.330 kV紧凑型线路V型合成绝缘子的载荷性能研究[J].中国电机工程学报,2005,25(15):91-95.LUE Bo,HOU Lei,WANG Liming,et al.Study on loading characteristics of V type composite insulator used in 330 k V compact line[J].Proceedings of the CSEE,2005,25(15):91-95.
[17]HOU L,WANG L M,GUAN Z C.Dynamics characteristic of V-string composite insulators for 330 kV overhead transmission line[C]∥IEEEConference on Electrical Insulation and Dielectric Phenomena.[S.l.]:IEEE,2006:429-432.
[18]杨肖辉,张东,李晓光,等.750 kV输电线路风偏跳闸原因分析及改造措施研究[J].电气工程学报,2017,12(1):40-46.YANG Xiaohui,ZHANG Dong,LI Xiaoguang,et al.Analysis and reform measures of 750 kV transmission line wind biased tripped[J].Journal of Electrical Engineering,2017,12(1):40-46.
[19]李黎,肖林海,罗先国,等.特高压绝缘子串的风偏计算方法[J].高电压技术,2013,39(12):2924-2932.LI Li,XIAO Linhai,LUO Xianguo,et al.Wingdage yaw calculation of UHV insulator strings[J].High Voltage Engineering,2013,39(12):2924-2932.
[2]郑智光,林锐,郭泉辉.沿海大风区超高压输电线路V型串设计中关键问题探讨[J].电网与清洁能源,2015,31(5):107-111ZHENG Zhiguang,LIN Rui,GUO Quanhui.Discussions on key issues in the design of V-shape string for EHV transmission line in coastal strong wind areas[J].Power System and Clean Energy,2015,31(5):107-111.
[3]楼文娟,余江,杨伦,等.输电线路防风偏闪络限位装置的设计[J].高电压技术,2016,42(10):3253-3262.LOU Wenjuan,YU Jiang,YANG Lun,et al.Design of the inhibiting device against flashover caused by windage yaw in transmission lines[J].High Voltage Engineering,2016,42(10):3253-3262.
[4]张永伟,王金岭.500 kV紧凑型线路六分裂导线架设[J].吉林电力,2010,38(4):51-53.ZHANG Yongwei,WANG Jinlin.Construction of 500 k V compact six-split conductor[J],Jilin Electric Power,2010,2010,38(4):51-53.
[5]谢辉春,崔翔,刘华钢,等.特高压同塔双回交流输电线路采用(8+2)分裂导线与常规导线电晕特性对比[J].高电压技术,2016,42(3):966-972.XIE Huichun,CUI Xiang,LIU Huagang,et al.Corona characteristic comparison of(8+2)bundled wire and normal wire applying in UHVAC double-circuit transmission line on the same tower[J].High Voltage Engineering,2016,42(3):966-972.
[6]王黎明,范钦珊,薛家麒.相间合成绝缘间隔棒后屈曲性态研究[J].清华大学学报:自然科学版,1996,36(9):70-76.WANG Liming,FAN Qinshan,XUE Jiaqi.Research and application of the large deflection of the phase to phase composite spacer[J].Journal of Tsinghua University:Science an Technology,1996,36(9):70-76.
[7]王黎明.相间合成绝缘间隔棒的研究[D].北京:清华大学,1993.WANG Liming,Research on the phase to phase composite spacer[D].Beijing,China:Tsinghua University,1993.
[8]廖永力,王黎明,张炎武,等.紧凑型输电线路复合绝缘子风偏变形分析[J].南方电网技术,2010,4(3):77-81.LIAO Yongli,WANG Liming,ZHANG Yanwu,et al.Analysis of windage yaw deformation of composite insulators in compact transmission lines[J].Southern Power System Technology,2010,4(3):77-81.
[9]楼文娟,杨悦,卢明,等.连续多跨输电线路动态风偏特征及计算模型[J].电力建设,2015,36(2):1-8.LOU Wenjuan,YANG Yue,LU Ming,et al,Conductor swinging dynamic characteristic and calculation model of continuous multi-span transmission line[J].Electric Power Construction,2015,36(2):1-8.
[10]楼文娟,罗罡,杨晓辉,等.输电线路动态风偏响应特性及频域计算方法[J].高电压技术,2017,43(5):1493-1499.LOU Wenjuan,LUO Gang,YANG Xiaohui,et al.Response characteristics and frequency-domain calculation method of dynamic wind-induced deflection of transmission lines[J].High Voltage Engineering,2017,43(5):1493-1499.
[11]王超.考虑地形影响的雷暴冲击风场特性研究[D].重庆:重庆大学,2015.WANG Chao.Wind field characteristics of downburst flow over topography[D].Chongqing,China:Chongqing University,2015.
[12]傅观君,王黎明,侯镭,等.±800 kV特高压直流耐张串应用复合绝缘子的可行性[J].中国电机工程学报,2011,31(22):119-125.FU Guangjun,WANG Liming,HOU Lei,et al.Feasibility of application of composite insulators in±800 k V UHV DC tension strings[J].Proceedings of the CSEE,2011,31(22):119-125.
[13]王黎明,曹露,梅红伟,等.1 000 kV特高压交流紧凑型输电线路综合工况下间隔棒抑制效果仿真研究[J].高电压技术,2017,43(11):3661-3667.WANG Liming,CAO Lu,MEI Hongwei,et al.Simulation research on the suppression effect of spacers on 1 000 k V UHV AC compact transmission lines under comprehensive conditions[J].High Voltage Engineering,2017,43(11):3661-3667..
[14]傅观君,王黎明,侯镭,等.大吨位复合绝缘子在特高压直流V型串上的应用[J].高电压技术,2011,37(3):658-665.FU Guanjun,WANG Liming,HOU Lei,et al.Application of long tonnage composite insulators on UHVDC V-type strings[J].High Voltage Engineering,2011,37(3):658-665.
[15]SUN B Q,HOU L,ZHANG C Y,et al.Extreme bending of composite insulators on 750 k V compact transmission lines[J].IEEE Transmissions on Dielectrics and Electrical Insulation,2010,17(6):1781-1786.
[16]乐波,侯镭,王黎明,等.330 kV紧凑型线路V型合成绝缘子的载荷性能研究[J].中国电机工程学报,2005,25(15):91-95.LUE Bo,HOU Lei,WANG Liming,et al.Study on loading characteristics of V type composite insulator used in 330 k V compact line[J].Proceedings of the CSEE,2005,25(15):91-95.
[17]HOU L,WANG L M,GUAN Z C.Dynamics characteristic of V-string composite insulators for 330 kV overhead transmission line[C]∥IEEEConference on Electrical Insulation and Dielectric Phenomena.[S.l.]:IEEE,2006:429-432.
[18]杨肖辉,张东,李晓光,等.750 kV输电线路风偏跳闸原因分析及改造措施研究[J].电气工程学报,2017,12(1):40-46.YANG Xiaohui,ZHANG Dong,LI Xiaoguang,et al.Analysis and reform measures of 750 kV transmission line wind biased tripped[J].Journal of Electrical Engineering,2017,12(1):40-46.
[19]李黎,肖林海,罗先国,等.特高压绝缘子串的风偏计算方法[J].高电压技术,2013,39(12):2924-2932.LI Li,XIAO Linhai,LUO Xianguo,et al.Wingdage yaw calculation of UHV insulator strings[J].High Voltage Engineering,2013,39(12):2924-2932.