行波激励下大跨越输电线路纵向地震响应分析  

Seismic Response Analysis of Large Span Transmission Line Under Longitudinal Traveling-Wave Excitation

作　　者：杨军永 朱从民 朱瑞元 YANG Junyong;ZHU Congmin;ZHU Ruiyuan(Laiwu Branch of State Grid Shandong Electric Power Co.,Ltd.,Jinan 271100,China;Electric Power Planning&EngineeringInstitute Co.,Ltd.,Beijing 100120,China)

机构地区：[1]国网山东省电力公司莱芜供电公司,济南271100 [2]电力规划总院有限公司,北京100120

出　　处：《南方电网技术》2021年第12期72-77,共6页Southern Power System Technology

摘　　要：为更加贴近输电线路实际路径状况,深入理解大档距、大高差、非一致激励下输电线路地震响应,选取某±500 kV直流输电线路大跨越段,利用“四塔三线”精细化有限元模型开展了地震动响应分析,结果表明:导地线显著降低铁塔固有频率;跨越塔受导地线约束明显,塔顶位移峰值较小;地线支架、横担和塔身主材应力均在弹性范围内;跨越档导线张力峰值远高于设计值,但仍然小于拉断力,且张力值与锚塔横担长度大小有一定相关性;行波激励对位移响应有一定的影响,但无规律可循,行波激励对杆件应力和导线张力的影响很小。In order to get closer to the actual path condition of transmission line and deeply understand the seismic response of transmission line under large span,large elevation difference and inconsistent excitation,a large span section of±500 kV DC transmission line is selected,and the refined finite element models with four tower and three span lines are established for seismic response analysis.The results show that the ground wire and conductor significantly reduces the natural frequency of the tower.The cross-over tower is obviously constrained by the ground wire and conductor,and the peak displacement of the tower top is very small.The member stress of ground wire peak,cross arm and tower body are all within the elastic range.The peak tension force of cross-over span conductor is much higher than the design value,but still less than the breaking force,and the value is related to the length of anchor tower cross arm.The influence of traveling wave excitation on the displacement response is irregular,and it has little effect on the member stress and conductor tension force.

关 键 词：大跨越 塔线体系 地震响应 行波激励 

分 类 号：TM726[电气工程—电力系统及自动化]