基于磁膜包覆技术的碳纤维复合芯压接缺陷漏磁检测方法研究  

Research on magnetic leakage detection technology for crimping defects of carbon fiber composite core based on magnetic thin film coating

作　　者：张航 杜志叶 闵永智[1] 廖永力 岳国华 李根 ZHANG Hang;DU Zhiye;MIN Yongzhi;LIAO Yongli;YUE Guohua;LI Gen(School of Automation and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730060,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China;Electric Power Research Institute of China Southern Power Grid,Guangzhou 510663,China)

机构地区：[1]兰州交通大学自动化与电气工程学院,甘肃兰州730060 [2]武汉大学电气与自动化学院,湖北武汉430072 [3]南方电网科学研究院有限责任公司,广东广州510663

出　　处：《电工电能新技术》2024年第9期82-93,共12页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金项目(51977152)。

摘　　要：双碳背景下,碳纤维复合芯导线具有环保、节能特性,有着良好的应用前景,但其芯棒较脆且不耐弯折,针对钢锚处压接部位质量检测暂无行之有效的方法,严重制约着该技术在输变电工程中的推广。为此,以横截面积为40 mm 2的碳纤维复合芯导线及耐张段压接金具为研究对象,通过磁性薄膜包覆的方式,提出了一种基于漏磁法的碳纤维芯棒压接缺陷检测方案。首先,构建了磁膜包覆后压接金具漏磁场分析模型,探究了漏磁装置的磁极间距L、径向气隙λ、探测靴深度h和宽度d在断裂和少压两种缺陷工况下对信噪比的影响,得出L=55 mm、λ=3.5 mm、h=7 mm、d=12 mm时,信噪比效果较好。在此基础上,通过增大断裂尺寸和少压程度,得出断裂漏磁场轴向分量呈现单峰值,径向分量呈现双峰值,而少压轴向和径向分量与之相反。最后,结合试验结果验证了所提出方案的可行性。结果表明:磁性薄膜具备反映碳纤维芯缺陷状态的能力;试验中发现,缺陷信号形态学特征体现为倒“V”形,与理论分析相符。研究成果可为碳纤维复合芯棒钢锚处压接质量检测提供一种新思路。Under dual-carbon background,carbon fiber composite core wire has the characteristics of environmental protection and energy saving,and has a good application prospect,but its core rod is brittle and not resistant to bending.There is no effective method for the quality inspection of the crimped part of the steel anchor,which seriously restricts the popularization of this technology in power transmission and distribution projects.In this paper,carbon fiber composite wire with a cross-sectional area of 40 mm 2 and tension section crimping fittings are used as research objects,and a scheme for crimping defects detection of carbon fiber core rod based on magnetic leakage method is proposed.Firstly,the magnetic leakage field analysis model of the compacting fitting after magnetic film coating is constructed.The influences of magnetic pole distance L,radial air gapλ,probe shoe depth h and width d on the SNR under two defect conditions of fracture and low pressure are investigated.It is concluded that the SNR effect is better when L=55 mm,λ=3.5 mm,h=7 mm and d=12 mm.On this basis,by increasing the fracture size and the degree of low pressure,it is concluded that the axial component of the fracture leakage magnetic field shows a single peak value,the radial component shows a double peak value,and the axial and radial components of the low pressure are opposite.Finally,the feasibility of the proposed scheme is verified by the experimental results.The results show that the magnetic film has the ability to reflect the defect state of carbon fiber core.It is found that the morphological characteristics of the defect signal are inverted"V"shape,which is consistent with the theoretical analysis.The research results can provide a new idea for the crimping quality inspection of steel anchors with carbon fiber composite mandrel.

关 键 词：CFCC 漏磁检测 压接缺陷 励磁结构参数 

分 类 号：TM726[电气工程—电力系统及自动化]