覆冰厚度随海拔高度变化导致导线上覆冰不均匀。给出导线覆冰厚度随高度变化和不均匀脱冰模型,利用附加单元法实现导线不均匀覆冰和脱冰塔线体系动力响应数值模拟方法。建立500kV四分裂线路典型孤立档和连续档塔线耦合体系有限元模型,研究导线不均匀覆冰脱冰后塔线体系的动力响应特征,分析杆塔载荷冲击系数、导线最大挂点支反力、纵向不平衡张力、脱冰跳跃高度等特征参数随线路档距、高差比和覆冰厚度的变化规律,以及极端情况下杆塔的应力和强度,为不均匀覆冰冰区输电杆塔塔头设计提供重要的依据。

Variation of ice thickness with altitude results in non-uniform icing distribution on conductor lines. The non-uniform icing and ice-shedding are defined and numerical simulation method for the dynamic response of tower-line system after ice-shedding from conductor with non-uniform ice are carried out with additional element method. The finite element models of typical isolated and multi-spans tower-line coupling systems of 500kV quad-bundle transmission lines are established, and the dynamic responses of the tower-line systems after ice-shedding from the conductor lines with non-uniform icing are numerically simulated. The dynamic response characteristics of the tower-line systems, including the stress distribution and load impact factor of the towers, the maximum reaction force at the connecting points, longitudinal unbalanced tension and jump height of the conductor lines after ice-shedding, vary with structural, icing and ice-shedding parameters are analyzed. The strength of towers under extreme conditions is also analyzed. The obtained results provide important instructions for the design of tower heads in the transmission lines in ice zones.

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国家电网公司科技项目(5200-202126072A-0-0-00)