中冰区输电线路不均匀脱冰张力动态特性研究

输电线路不均匀脱冰是引发线路故障和缺陷的重要原因，为分析脱冰过程的张力动态变化规律，利用有限元分析软件，建立了典型设计条件下的连续档塔线耦合体系有限元模型，分析了不同电压等级、不同因素对输电线路导线脱冰张力动态特性的影响，提炼出了拟合计算公式。结果表明，脱冰率、覆冰厚度、档距、导线型号对导线张力差影响较大，档数和高差影响较小；对于中冰区架空输电线路，导线脱冰后的不平衡张力差峰值约为稳态不平衡张力的1.71倍。设计时应充分考虑瞬时峰值对塔线体系的破坏性影响。

Dynamic tension characteristics of non-uniform ice-shedding on transmission lines in moderate ice zones

Non-uniform ice-shedding on transmission lines is a significant contributor to line faults and defects.To analyze the dynamic tension variations during the ice-shedding process in moderate ice zones,a finite element model,representing the continuous span-tower coupled system under typical design conditions,is established using finite element analysis software.This study examines the influence of various voltage levels and factors on the dynamic tension characteristics of ice-shedding and derives a fitting calculation formula.Results show that factors such as ice-shedding rate,icing thickness,span length,and conductor type have a significant impact on the tension disparities of the conductor.In contrast,the number of spans and height differences have minimal impacts.For overhead transmission lines in moderate ice regions,the peak unbalanced tension difference in the conductor after ice-shedding is about 1.71 times that of the steady-state unbalanced tension.It is crucial in design considerations to acknowledge the potential destructive impact of the instantaneous peak on the tower-line system.