云南省多座变电站内发现电流互感器引流抱箍线夹断裂，通过宏观分析、化学成分分析、断口分析、金相检验、力学性能测试、有限元分析等方法，对线夹的断裂原因进行了分析。结果表明：铝合金和铜合金抱箍线夹的断裂模式均为脆性断裂，主要原因是安装过程中线夹过度紧固，导致在线夹抱耳结构转折处产生较大的应力集中，当应力超过材料屈服强度时发生断裂。部分铜合金线夹化学成分和断后伸长率不合格也是导致该型线夹断裂的重要原因。

The fracture of current transformer drainage hoop clamp was found in several substations in Yunnan Province. The causes of fracture on clamp were analyzed by means of macro analysis, chemical composition analysis, fracture analysis, metallographic inspection, mechanical property test and finite element analysis. The results show that the fracture mode of aluminum alloy and copper alloy hoop clamp is brittle fracture. The main reason was that the clamp was over tightened during installation, resulting in large stress concentration at the turning point of the structure of clamp lug. When the stress exceeded the yield strength of the material, the clamp fractured. Unqualified chemical composition and elongation after fracture of some copper alloy clamps were also important reasons for the fracture of this type of clamp.