针对某500 kV输电线路六分裂导线中子导线断裂事故，进行了材质试验、有限元仿真计算和断线综合分析。结果表明，子导线断线是由于导线受扭转剪切应力导致部分铝股先剪切断裂，再由脱冰形成的动张力和覆冰静力荷载联合作用所致。在分析结果的基础提出了运行维护和整改措施，为避免类似事故发生提供参考。

According to the fracture failure of sub-conductor of 6-split conductor in 500 kV transmission line, the material test, finite element simulation and comprehensive analysis of fracture failure were carried out. The analysis results show that the sub-conductors fracture failure are caused by the shear fracture of partial aluminum wires due to the shear stress of conductor torsion, as well as the combined effect of dynamic tension formed by ice-shedding and icing static load. Based on the research results, this paper proposed the corresponding measures for the operation, maintenance and reformation, which could provide reference to avoid similar failures.