摘要
为了有效分析输电线路在覆冰作用下的正常运行情况,针对重覆冰区气象特征,结合旋转圆柱覆冰增长模型对覆冰区域进行12 h覆冰荷载及风荷载的计算;根据110 kV输电线路特征,采用梁杆分析单元,建立多塔塔-线耦合有限元模型;然后,基于有限元法(FEM)分析软件ANSYS进行覆冰增长动态响应分析.研究表明:在12 h覆冰过程中,线路整体运行平稳,不会出现失稳倒塔现象;不均匀档距和高差在顺线路方向对杆塔影响较大,12 h覆冰过程中杆塔塔头最大应力分别超过标准杆塔7.6%和12.2%;转角由于横向力作用对杆塔扭转影响较大,12 h覆冰过程中转角10°和15°的杆塔塔身最大应力分别超过标准杆塔98.5%和192.4%;线路中不均匀档距、转角及高差产生的不平衡张力是导致杆塔变形增大的主要原因.分析结果同线路实际运行情况相符,可用于架空输电线路覆冰可靠性分析和指导线路除冰.
In order to effectively analyze the normal operation of transmission lines under the action of icing, 12h icing load and wind load are calculated in the ice-covered area according to the meteorological characteristics of the repeated ice-covered area and the rotating cylindrical ice-covered growth model. A multi-tower coupled finite element model is established by adopting the beam and line analysis element based on the characteristics of the 110kV transmission line. Furthermore, the dynamic response of icing growth is analyzed based on the finite element method(FEM) software ANSYS. The results show that the whole line runs smoothly during the 12h icing process and there is no instability and the phenomenon of falling tower. The span difference and elevation difference have great influence on the tower along the line direction, and the maximum stress of the tower head during the 12h icing is 7.6% and 12.2% higher than that of the standard tower, respectively. The rotation Angle has a great influence on the tower torsion due to the transverse force. The maximum stress of the 10° and 15° tower is 98.5% and 192.4% higher than that of the standard tower during the 12h icing process, respectively. The unbalance tension caused by uneven distance, angle and height difference is the main reason for the increase of tower deformation. The analysis results are consistent with the actual operation of the line and it can be utilized to analyze the icing reliability of overhead transmission lines and have a guidance for the de-icing measures of the power lines.
作者
屈勇
张鸣
张栋
方燕华
杨璐
方子帆
QU Yong;ZHANG Ming;ZHANG Dong;FANG Yanhua;YANG Lu;FANG Zifan(Foshan Power Supply Bureau of Guangdong Power Grid Co.Ltd.,Foshan 528000,China;Foshan Electric Power Design Institute Co.Ltd.,Foshan 528000,China;College of Mechanical&Power Engineering,China Three Gorges Univ.,Yichang 443002,China)
出处
《三峡大学学报（自然科学版）》
CAS
2023年第2期101-107,共7页
Journal of China Three Gorges University：Natural Sciences
基金
中国南方电网有限公司科技项目(030600KK52180201)。
关键词
塔-线体系
覆冰荷载
风荷载
不平衡张力
有限元法
tower-line system
icing load
wind load
unbalanced tension
finite element method
