风荷载作用下输电线路应力试验及金具失效分析  

Stress Test and Hardware Failure Analysis of Transmission Lines Under Wind Load

作　　者：张吉波 薄志诚 ZHABG Ji-bo;BO Zhi-cheng(Gansu Electric Power Company Zhangye Power Supply Company,Zhangye 734000)

机构地区：[1]国网甘肃省电力公司张掖供电公司,张掖734000

出　　处：《环境技术》2024年第10期125-131,166,共8页Environmental Technology

摘　　要：针对风荷载作用下架空输电线路存在线路共振、塔架倾斜和绝缘性能下降等缺点,本文提出了一种输电线路在风荷载作用下的应力评估方法及金具失效分析方法,将结构参数和风荷载的不确定性结合到一个数值模型中。首先,为了提高计算效率,提出了一塔两跨的简化模型,通过在静态和动态条件下与完整的塔线系统进行比较,验证了该模型。接着,介绍了风荷载作用下输电塔的应力分析过程,建立不确定性的风荷载模型并进行非线性动力分析。随后,确定随机变量及其相应的概率分布。最后,对一个实际运行的输电塔进行了风荷载作用下的算例分析。实验结果表明,与传统的FEM和改进的DLC-FEM等模型相比,本文所提的DLC-GFM-FEM模型考虑了风攻角、阻力和升力系数等因素,在塔移距离、输电线路应力和金具失效概率等方面的评估精度更高,鲁棒性更强,将有助于提高输电线路在风荷载作用下的安全性和稳定性。In response to the disadvantages of line resonance,tower tilt,and insulation performance degradation in overhead transmission lines under wind loads,this paper proposes a stress assessment method and hardware failure analysis method for transmission lines under wind loads.The uncertainty of structural parameters and wind loads is combined into a numerical model.Firstly,in order to improve computational efficiency,a simplified model of one tower with two spans was proposed,and the model was validated by comparing it with a complete tower line system under static and dynamic conditions.Next,the stress analysis process of transmission towers under wind load was introduced,and an uncertain wind load model was established for nonlinear dynamic analysis.Subsequently,determine the random variables and their corresponding probability distributions.Finally,a case study was conducted on an actual operating transmission tower under wind load.The experimental results show that compared with traditional FEM and improved DLC-FEM models,the DLC-GFM-FEM model proposed in this paper considers factors such as wind attack angle,drag,and lift coefficient.It has higher evaluation accuracy and stronger robustness in terms of tower displacement distance,transmission line stress,and hardware failure probability,which will help improve the safety and stability of transmission lines underwind loads.

关 键 词：风荷载 输电线路 应力试验 塔移距离 金具失效分析 

分 类 号：V216[航空宇航科学与技术—航空宇航推进理论与工程]