超声导波技术在GIS穿墙套管腐蚀检测中的可行性研究

Feasibility Study of Ultrasonic Guided Wave Technology in Corrosion Detection of GIS Wall Bushing

GIS穿墙套管与墙体接触部位的局部表面易发生点状、孔状腐蚀,在不破拆墙体的情况下,采用常规方法无法准确检测该部位腐蚀情况。超声导波检测是国际上新兴的一种快速评估管道缺陷的无损检测技术,通过搭建一套基于磁致伸缩原理的自激自收扭转导波检测系统,验证该技术在GIS穿墙套管腐蚀检测中的可行性。试验结果表明,超声导波在通过墙体后能量衰减较小,不存在信号的模态转换,对检测结果的准确性影响较小。超声导波技术可以应用于GIS穿墙套管腐蚀检测工作。

Pitting corrosion which is prone to happen on the local surface of contact area between GIS wall bushing and wall cannot be detected accurately by routine method without breaking the wall.Ultrasonic guided wave detection is an emerging nondestructive detection technology for rapid assessment of pipeline defects in the world.The feasibility of the technology in the corrosion detection of GIS wall bushing is testified by building a set of torsional guided wave detection system with self-excitation and selfreception based on magnetostriction principle.Test results show that the ultrasonic guided wave has lower energy attenuation after passing through the wall and has no signal mode conversion which has little effect on the accuracy of the detection results.The ultrasonic guided wave technology can be applied in the corrosion detection of GIS wall bushing.