基于两半式涡流线圈和巡线机器人的高压输电线在线检测系统  

Eddy Current Online Inspection System of Power Transmission Line Based on Two Separate Coils and Line-tracking Robot

作　　者：郭锐 曹雷 贾娟 贾永刚 程军[3] 裘进浩[3] 季宏丽[3] 

机构地区：[1]国网山东省电力公司电力科学研究院电力机器人技术实验室,山东济南250002 [2]山东鲁能智能技术有限公司研发中心,山东济南250101 [3]南京航空航天大学机械结构力学及控制国家重点实验室,江苏南京210016

出　　处：《仪表技术与传感器》2016年第3期86-89,110,共5页Instrument Technique and Sensor

基　　金：国家电网公司重点科技项目;中央高校基本科研业务费专项资金资助(NE201510&NE2015001);中国博士后特别资助(2014T70514);江苏省产学研联合创新资金(BY2014003-01)

摘　　要：设计了一种新型的两半式涡流探头,结合线上机器人巡查机构,用于高压输电线的在线无损检测,涡流探头由两半共4个扇形线圈绕组组成。设计了基于涡流检测和机器人技术的检测系统硬件平台,阐述了涡流探头用于输电线外层铝绞线缺陷检测的工作方式,探头传感信号通过锁相放大器提取。为了提高信噪比,采用了小波变换的方法对信号中噪声予以去除。通过对3种激励频率下检测信号值的比较,得出两半式涡流探头用于输电线在线检测的灵敏度随频率增加而改善。A novel two separate coils type eddy current probe combining line-tracking robot was designed for online inspection of power transmission line. The probe was composed of four sectorial coil windings in two halves. The hardware platform of the detection system based on ECT and robot techniques was constructed,and the work principle of the probe for the wire breakage in outer aluminum strand was described. The eddy current testing signal was extracted by lock-in amplifier. In order to improve the signal to noise ratio,wavelet denoising technique was adopted to eliminate the high-frequency noise. From the comparison of the signals under three test frequencies,we can see that the detection sensitivity gets better with the increase of frequency.

关 键 词：输电线 电涡流 无损检测 巡线机器人 锁相放大 小波去噪 

分 类 号：TG115.28[金属学及工艺—物理冶金]