特高压交流线路的单档和3档舞动计算分析  

Calculative Study on Galloping of Single-span and Three-span UHV Transmission Lines

作　　者：胡霁[1] 郭若颖[2] 裴长生 闵绚[1] 邵瑰玮[1] 万丽芬 

机构地区：[1]中国电力科学研究院,武汉430074 [2]国网山西省电力公司检修公司,太原030032 [3]国网太原供电公司,太原030012 [4]湖北省计量测试技术研究院,武汉430223

出　　处：《高电压技术》2013年第12期3009-3014,共6页High Voltage Engineering

基　　金：国家电网公司科技项目(SG[1052];SG[11005]);国际科技合作项目(2008DFR60010)~~

摘　　要：目前针对单档和3档的多分裂导线舞动模型适用范围的研究较少。因此针对特高压交流线路的特点,建立了单档和3档特高压交流输电线路导线-绝缘子串耦合有限元模型,对线路舞动进行了仿真计算,分析比较了单档和3档模型计算结果的差异。结果表明,无论是三角形排列还是水平排列的特高压交流线路,当左右2档无高差时,单档模型的计算结果与3档模型差异较大(平均差异率为10.9%);当左右2档存在较大高差(50m)时,单档模型的计算结果与3档模型的计算结果较符合(平均差异率为4.9%)。由于单档模型两端的固定约束产生了较大约束力,而3档模型左右2档大高差对中档线路的约束也起到加强作用,其计算条件与单档模型的固定约束较为接近,因此两者计算结果也较符合。说明当左右2档存在大高差时,可采用建立单档模型替代3档模型进行舞动仿真计算,可在不影响计算结果偏差的情况下达到控制计算时间成本的目的。Taking the characteristics of ultra-high voltage（UHV） transmission line into consideration, we established conductor-insulator strings coupled finite element models of single-span and three-span lines, then calculated and compared galloping of UHV transmission lines with the models. The results show that a relatively large difference exists between the calculation results of the single-span and three-span models （the average difference rate is 10.9% ）, when the left and right spans have the same height and no matter the lines are triangularly-arranged or horizontally-arranged; however, when the left and right spans have a height difference more than 50 meters, the calculation results of the single-span model well agree with those of the three-span model （ the average difference rate is 4.9 % ）. The fixed constraint of single-span model produces a strong constraint force, meanwhile, the large height difference in three-span model enhances the constraint of middle span, leading to calculative conditions close to the fixed constraint of single-span model, so there is good agreement between the results of the two models. It is concluded that when a large height difference exists between left and right spans, single-span model can replace three-span model to calculate and emulate galloping, so the time cost of computing can be reduced without affecting the deviation the calculation results.

关 键 词：特高压 线路舞动 分裂导线 有限元分析 最小相间距离 振幅 

分 类 号：TM751[电气工程—电力系统及自动化]