摘要：对三跨输电导线体系建立了有限元模型并进行了导线找形，讨论了脱冰前后导线的动力特性，模拟分析了导线脱冰前的稳态响应、脱冰后的瞬态响应及稳态响应，对输电导线不均匀脱冰进行全过程模拟分析。研究发现：本文提出的基于静力平衡的找形方法对于输电导线是一种高效的找形方法,覆冰前后导线自振频率变化很小。导线覆冰30mm后的导线张力和绝缘子串的张力分别是初始张力的3.9倍和4倍。不均匀脱冰对导线的最大张力影响不大，但会使绝缘子串张力显著增加，并产生导线不平衡张力，其瞬态幅值达2倍多的导线初始张力，对输电塔的安全性构成威胁。

ABSTRACT: A finite element model of a three-span transmission lines system was built with ANSYS. The form-finding of cables was completed, and the dynamic characteristics pre and post ice-shedding were discussed. The whole process analysis for non-uniform ice-shedding of transmission lines was realized by simulating the steady response during icing, the transient and the steady response after ice-shedding. The study found that the static equilibrium-based form-finding method is efficient, and the frequencies of the system change little while icing. The maximum tensions of the cable and the insulator string increase to 3.9 and 4 times of the initial tensions respectively when the ice thickness raises up to 30mm. The influence of the non-uniform ice-shedding on the cable tension can be ignored, while it enlarges the insulator string tension significantly and produces an unbalanced tension with a transient magnitude of 2 times of the cable’s initial tension, threatening the transmission towers.