碳纤维复合芯导线断裂机理及原因分析  

Fracture mechanism and cause analysis of carbon fiber composite core conductor

作　　者：郑建军 田峰[1,2] 张涛 陈浩[1,2] ZHENG Jianjun;TIAN Feng;ZHANG Tao;CHEN Hao(Inner Mongolia Power Research Institute,Hohhot 010020,China;Inner Mongolia Enterprise Key Laboratory of High Voltage and Insulation Technology,Hohhot 010020,China)

机构地区：[1]内蒙古电力科学研究院,呼和浩特010020 [2]内蒙古自治区高电压与绝缘技术企业重点实验室,呼和浩特010020

出　　处：《复合材料科学与工程》2023年第4期107-112,共6页Composites Science and Engineering

基　　金：内蒙古电力(集团)有限责任公司2022年科技计划项目“输电铁塔球头连接金具断裂机理及疲劳寿命提升关键技术研究”(2022-08)。

摘　　要：本文针对某220 kV输电线路在运行过程中发生断裂故障的碳纤维复合芯导线,采用宏观及微观形貌观察、X射线能谱检测、傅里叶红外光谱分析、热分解试验、抗压性能测试等方法,对未服役(新)和断裂的碳纤维复合芯导线进行了检测分析,并研究了其断裂原因和断裂机理。结果表明:碳纤维复合芯导线的断裂主要与微风振动引发的玻璃纤维层的微动磨损和碳纤维芯的微动疲劳有关;玻璃纤维层在发生磨损后诱发了局部放电现象,放电过程中产生的高温及硝酸导致了环氧树脂的熔解及玻璃纤维的应力腐蚀,从而进一步加剧了碳纤维复合芯的断裂;根据断裂机理可以将碳纤维复合芯的断裂过程划分为5个阶段。当碳纤维复合芯断裂后,导线的负荷张力将超过T形铝绞线的允许张力,并在短时间运行后引发断线故障。In this paper,aiming at one fracture fault of the carbon-fiber composite core wire operated in a 220 kV transmission line,the non in-serviced(new)and broken carbon-fiber composite core wires were tested and analyzed by means of macro and micro morphology observations,X-ray energy spectrum detection,fourier infrared spectroscopy analysis,thermal decomposition experiment,compressive performance testing and so on,and the fracture causes and fracture mechanism were also investigated.The results indicate that the fracture of carbon-fiber composite core wire is mainly related to the fretting wear of glass fiber layer and fretting fatigue of carbon fiber core caused by breeze galloping.In addition,partial discharge is induced when the glass fiber layer is worn.And the high temperature and nitric acid produced during discharge lead to the melting of epoxy resin and stress corrosion of glass fiber,further aggravating the fracture of carbon fiber composite core.The fracture mechanism results reveal that the fracture process of carbon-fiber composite core wire can be divided into five stages.When the carbon fiber composite core is entirely broken,the load tension will exceed the allowable tension of T-shaped aluminum lines,resulting in cracking after short-time operation.

关 键 词：玻璃纤维 碳纤维 放电 微动磨损 微动疲劳 断裂 

分 类 号：TB332[一般工业技术—材料科学与工程]