覆冰输电架空导线初始构形研究

Original State for Overhead Icing Transmission Line

针对输电架空导线初始构形分析是进行塔—线耦合动力分析的前提问题,将悬索结构非线性有限元找形原理与方法应用于架空导线的初始构形研究中,利用ANSYS仿真研究了1 000 kV晋东南—南阳—荆门特高压汉江大跨越输电线路在覆冰荷载作用下的平衡状态。结果表明,在自重、均匀覆冰下,该方法对架空导线初始构形的分析与解析法结果较为接近;不均匀覆冰时,导线中应力超过了其最大使用应力,在线路覆冰时应予以重视。

Analysis of overhead line initial shape is the premise of dynamics coupling analysis of transmission tower-line system.The principles and methods of non-linear finite element for form finding of cable structures are applied to the initial form finding of overhead line.The equilibrium state of 1 000 kV Jindongnan-Nanyang-Jingmen UHV long-span transmission line crossing the Jianghan bridge with icing load is calculated by applying ANSYS software.Research results show that the results of initial state analysis of overhead line is close to that of analytical method under the dead-weight and uniform icing;while the stress of overhead line exceeds its maximal allowed stress under the inhomogeneous icing conditions,which should be paid great attention when transmission line is covered with icing.