通过建立连续7档导线—绝缘子有限元模型，考虑导线与地面接触、导线阻尼、分裂数和子间隔棒等因素的影响，分析了不同工况下导线的断线响应。有限元计算结果与试验结果基本一致，验证了分析模型的合理性。考虑地面接触前后断线张力计算结果基本一致。子导线未全部断裂时，有子间隔棒模型计算得到的断线张力远小于无子间隔棒模型。对于悬垂型杆塔，静力分析得到的20mm、30mm冰区断线张力取值略小于规程规定下限值，其余冰区计算值比规程规定下限值高约10%。动力分析时假定八分裂导线断4根子导线，悬垂型杆塔断线张力计算值小于规程规定值。

With the consideration of conductor-ground contact, damping coefficient, bundle numbers and spacers, a seven continuous span FEA model of conductors and insulators was established. Under different load cases, the dynamic responses of the broken conductors were analyzed. The calculated results are well agreed with the experimental values, and the rationality of the FEA model was verified. The unbalanced tensions from broken conductors are almost same with and without conductor-ground contact. When all the sub-conductors are not broken simultaneously, the unbalanced tensions calculated by the model with spacers are much lower than those by the model without spacers. For suspension towers in 20mm and 30mm icing areas, the tensions calculated by the static analysis method are a little lower than the limit values in the regulation. For other icing areas, the calculated values are higher than the regulated values by about 10 percentages. Four sub-conductors of the eight bundle conductor are assumed broken in the dynamic analysis. The tensions from broken conductors are lower than the regulated values.