长横担输电塔线体系动力响应分析及安全评估  

Dynamic response analysis and safety assessment of long cross-arm transmission tower-line system

作　　者：方春华 陶玉宁[1,2] 张威 李景 陈杰 张廼龙 FANG Chunhua;TAO Yuning;ZHANG Wei;LI Jing;CHEN Jie;ZHANG Nailong(Hubei Provincial Engineering Technology Research Center for Power Transmission Line,Yichang 443002,China;College of Electrical Engineering and New Energy,CTGU,Yichang 443002,China;Yichang Power Supply Company,State Grid Hubei Electric Power Co.,Ltd.,Yichang 443000,China;State Grid Anqing Electric Power Supply Company,An′qing 246000,China;State Grid Jiangsu Electric Power Co.,LTD.Research Institute,Nanjing 211103,China)

机构地区：[1]湖北省输电线路工程技术研究中心,湖北宜昌443002 [2]三峡大学电气与新能源学院,湖北宜昌443002 [3]国网湖北省电力有限公司宜昌供电公司,湖北宜昌443000 [4]国网安庆供电公司,安徽安庆246000 [5]国网江苏省电力有限公司电力科学研究院,江苏南京211103

出　　处：《自然灾害学报》2020年第5期209-220,共12页Journal of Natural Disasters

基　　金：湖北省输电线路工程技术研究中心(三峡大学)。

摘　　要：±800kV直流输电塔横担较长、塔头迎风面积大且铁塔构架填充系数大,横担和塔腰部在极端风荷载作用下存在受损甚至折断的风险。为此建立了±800kV特高压输电塔线耦联体系三维有限元模型,采用谐波叠加法模拟沿高度变化的Kaimal风速谱,完成三塔两线体系的动力学风振响应时程分析。为了全面反映铁塔的受损情况,进而评估输电塔的正常运行状态、临界安全状态、不安全状态,分12种工况计算模型的内力及变形。分析结果表明:位移与风速的平方成正比,与最大应力水平呈一次曲线关系,铁塔变形结构薄弱部位于横担、地线支架、横担连接处、塔身变坡点、塔腿及导地线挂板;风速达到30 m/s时,杆塔受力趋近破坏临界线,风速达40 m/s以上时,导地线挂板与塔头主材连接处将破损导致断线。最后,根据位移形变和应力水平定义了相应的三级预警安全诊断区间,为铁塔的安全诊断和预警评价提供理论依据。The±800 kV DC transmission tower has a long cross arm,a large windward area of the tower and a large filling factor of the tower structure,and the risk of damage and even breakage of the cross arm and the tower waist under extreme wind loads.This paper established a three-dimensional finite element model of±800 kV UHV transmission tower-line coupling system,then used Kaimal wind speed spectrum and harmonic superposition method to simulate wind speed which varies along the height,finished dynamic wind-induced response time history analysis of three-tower-two-line system.In order to fully reflect the damage situation of the tower,and then evaluate the normal operation state,critical safety state and unsafe state of the transmission tower,the internal force and deformation of the model are calculated under 12 working conditions.The results show that the displacement is directly proportional to the square of wind speed and has a first-order curve relationship with the maximum stress level.The weak parts of the deformation structure of the tower lie in the cross-arm,ground support,cross-arm connection,slope change point of the tower body,tower leg and ground guide hanging plate.When the wind speed reaches 30 m/s,the stress of the tower tends to break the critical line.When the wind speed is over 40 m/s,the connection between the ground wire hanging plate and the main material of the tower head will be damaged and lead to wire breakage.Finally,the displacement deformation and stress levels calculated from the simulation data define the corresponding three-level early warning safety diagnosis interval,and provide a theoretical basis for the safety diagnosis and early warning evaluation of the tower.

关 键 词：风速谱 长横担 三塔两线 谐波叠加法 风振响应 安全诊断 

分 类 号：TM75[电气工程—电力系统及自动化]