The dynamic response characteristics, including maximum jump height and unbalanced tension, of isolated-span transmission lines after ice-shedding are investigated by means of experiments. A reduced-scale modelling method for ice-shedding from conductor lines is presented and verified with numerical simulations and full-scale test results in the literature. A parameter study on dynamic responses of isolated-span conductors under three ice-shedding scenarios, including whole span ice-shedding, partial ice-shedding and unzipping ice-shedding, is carried out by means of reduced-scale modelling tests. The effects of these parameters on the maximum jump height at typical positions and unbalanced tension in the tension tower are obtained. It is observed that the partial ice-shedding scenario may be the worst situation for electrical insulation clearance rather than the whole span ice-shedding scenario. Moreover, the position of maximum jump height along the span of isolated-span transmission lines after ice-shedding could be at around 2/5 of span length, which is different from the conventional opinion that the position is at the midpoint. The results may provide a foundation for the defining of the insulation clearance for an isolated-span transmission line and the structure design of tension tower arms in an iced zone.

中文翻译：

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跨度输电线路破冰后动力响应特性试验研究

通过试验研究了孤跨输电线路破冰后的最大跳高和不平衡拉力等动态响应特性。文献中提出并通过数值模拟和全尺寸测试结果验证了导线脱落的缩小比例建模方法。通过缩比模型试验，对跨度导线在全跨度脱落冰、局部脱落冰和解压脱落冰三种情况下的动态响应进行了参数研究。获得了这些参数对典型位置最大跳跃高度和张力塔中不平衡张力的影响。据观察，部分脱冰情况可能是电气绝缘间隙最差的情况，而不是整个跨度脱冰情况。此外，脱冰后的孤跨输电线路沿跨距的最大跳高位置可能在跨距的2/5左右，这与通常认为的中点位置不同。研究结果可为孤跨输电线路绝缘间隙的确定和冰区张拉塔臂的结构设计提供依据。这与位置在中点的传统观点不同。研究结果可为孤跨输电线路绝缘间隙的确定和冰区张拉塔臂的结构设计提供依据。这与位置在中点的传统观点不同。研究结果可为孤跨输电线路绝缘间隙的确定和冰区张拉塔臂的结构设计提供依据。