某220kV输电线路悬垂线夹断裂原因  

Cause of Fracture on Suspension Clamp of a 220kV Transmission Line

作　　者：杨迎春 虞鸿江 代克顺 YANG Yingchun;YU Hongjiang;DAI Keshun(Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650217,China)

机构地区：[1]云南电网有限责任公司电力科学研究院,昆明650217

出　　处：《理化检验（物理分册）》2021年第7期48-51,56,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：云南电网科技项目(YNKJXM20180175)。

摘　　要：某220 kV输电线路XGF-6X型ZL102铝合金悬垂线夹在运行中发生断裂,通过宏观分析、化学成分分析、硬度测试、机械破坏载荷测试、射线检测、断口分析等方法对悬垂线夹的断裂原因进行了分析。结果表明:悬垂线夹的尺寸不符合设计要求,且悬垂线夹的内部存在气孔、夹渣等铸造缺陷,使得悬垂线夹的机械破坏载荷低于标准的要求,运行中由于覆冰导致悬垂线夹垂直载荷增大,最终发生过载断裂。The XGF-6 X ZL102 aluminum alloy suspension clamp of a 220 kV transmission line fractured during operation.The causes of fracture on suspension clamp were analyzed by means of macro analysis,chemical composition analysis,hardness test,mechanical failure load test,radiographic inspection and fracture analysis.The results show that the size of suspension clamp did not meet the design requirements,and there were some casting defects such as pores and slag inclusions in suspension clamp,which made the mechanical failure load of suspension clamp lower than the standard requirements.During operation,the vertical load of suspension clamp increased due to icing,and finally overload fracture occurred.

关 键 词：悬垂线夹 机械破环载荷 铸造缺陷 过载断裂 ZL102铝合金 

分 类 号：TM241[一般工业技术—材料科学与工程] TM203[电气工程—电工理论与新技术]