摘要
长期运行在恶劣环境下的耐张线夹铝线压接区(压接管),内部容易产生进水、腐蚀甚至断线等不易发现的潜伏性缺陷。基于相控阵超声聚焦特性,研究铝线断线、进水与腐蚀缺陷的最佳检测位置以及回波特征,提出基于相控阵超声检测压接管潜伏性缺陷的方法,并通过试验验证该方法的准确性。结果表明:将声束聚焦于铝管-铝线界面的中心有利于检测压接管铝线断线缺陷,聚焦于铝管-空气界面中心有利于检测进水腐蚀缺陷;压接管内铝线断线会增大空气界面,断线处界面回波幅值增大,导致下层界面回波幅值衰减;对于内部进水腐蚀,铝管-缺陷界面回波幅值规律为无缺陷>进水>腐蚀,回波在铝管-腐蚀界面发生反向,铝管-水界面与第二层铝线界面间产生微小回波。该方法为检测压接管内部缺陷提供了一种新的思路。
Long-term operation in the harsh environment of the aluminium crimp zone(crimp tube),easily generated inside the water,corrosion and even broken lines and other latent defects not easily detected.Based on the focusing characteristics of phased-array ultrasound,the optimal location and echo characteristics for the detection of wire breakage,water ingress and corrosion defects are investigated,and a method based on phasedarray ultrasound is proposed to detect latent defects in the crimped tube.The results show that:focusing the acoustic beam on the centre of the aluminium tube-aluminium wire interface is beneficial for detecting the aluminium wire breakage defects in the pressed tube,focusing on the centre of the aluminium tube-air interface is useful for detecting water ingress corrosion defects;the aluminium wire breakage in the crimped tube will increase the air interface,and the echo amplitude of the interface at the breakage increases,resulting in the attenuation of the echo amplitude of the lower interface;for internal water ingress corrosion,the echo amplitude of the aluminium tube-defective interface is no defect>water ingress>corrosion.the echo in the aluminium tube-corrosion interface occurs in reverse,the aluminium tube-water interface and the second layer between the interface of the aluminium line produces a small echo.This method provides a new way of thinking for the detection of internal defects in crimp tube.
作者
方春华
游海鑫
胡冻三
董晓虎
夏荣
陶玉宁
崔岩
柯力
FANG Chunhua;YOU Haixin;HU Dongsan;DONG Xiaohu;XIA Rong;TAO Yuning;CUI Yan;KE Li(College of Electrical and New Energy,China Three Gorges University,Yichang 443002,China;State Grid Hubei Electric Power Company Maintenance Company,Wuhan 430000,China;China Electric Power Research Institute,Wuhan 430074,China)
出处
《中国测试》
CAS
北大核心
2023年第5期39-44,163,共7页
China Measurement & Test
基金
2020年度电网环境保护国家重点实验室开放基金项目(GYW51202201415)。
关键词
输电线路
耐张线夹
压接管
相控阵超声
潜伏性缺陷
transmission lines
tension clamp
crimp tube
phased array ultrasound testing
potential defects
