悬垂线夹内导线断股的超声导波检测方法仿真研究  

Simulation of Ultrasonic Guided Waves Detecting Wire Breakage Inside Suspension Clamp

作　　者：孟晓波 陈文灿 杨代铭 梅红伟[2] 王黎明[2] 廖永力 李锐海 MENG Xiaobo;CHEN Wencan;YANG Daiming;MEI Hongwei;WANG Liming;LIAO Yongli;LI Ruihai(CSG Electric Power Research Institute,Guangzhou 510663,China;Graduate School at Shenzhen,Tsinghua University,Shenzhen 518055,China)

机构地区：[1]南方电网科学研究院有限责任公司,广东广州510663 [2]清华大学深圳研究生院,深圳518055

出　　处：《智慧电力》2018年第7期67-74,共8页Smart Power

基　　金：国家重点研发计划(2016YFB0900802)~~

摘　　要：输电导线断股是电力系统中比较常见的安全隐患。为了实现线夹内断股导线的快速无损检测,提出了利用超声导波检测输电导线方法,并利用有限元仿真软件ANSYS对此进行了仿真研究。首先确定检测导波的模态和频率,接着分别对线夹外及线夹内导线断股情况进行研究。仿真结果表明,对于线夹外的缺陷,L(0,1)模态和T(0,1)模态的导波能够检测出来,利用反射系数和透射系数可以分辨出缺陷的大小;对于线夹内的缺陷,T(0,1)模态导波对此并不敏感,L(0,1)模态导波检测到的缺陷回波叠加在线夹端面发射波上难以识别。分析了导波能检测到的相邻2个缺陷或者截面变化之间的最小距离。由于导线夹的长度小于该最小距离,缺陷回波必然会叠加在端面回波而导致难以识别出来,因此超声导波检测在工程上难以检测线夹内部导线缺陷。Transmission wire breakage is the common security risks in power system. In order to realize the fast non - destructive testing of stranded wire in the clamp, a method of detecting the transmission wire by ultrasonic guided wave is put forward, and the finite element simulation software ANSYS is used to simulate the transmission wire. Firstly, the modal and frequency of the guided wave are determined, and then the simulation of the wire breakage in the wire clamp and outside the wire clamp is carried out. The simulation results show that the L （0, 1 ） and the T （0, 1 ） guided wave can be detected for the defects outside the clamp, and the size of the defect can be distinguished by the reflection coefficient and the transmission coefficient. T （0, 1 ） guided waves are not sensitive to the defects in the clamp, and the defect echoes detected by L （0, 1 ） guided waves are difficult to identify from the wave of the edge of the clamp. The minimum distance between adjacent two defects or cross section changes is analyzed. As the length of the wire clamp is less than this minimum distance, the defect echo is bound to be superimposed on the edge echo and it is difficult to identify it. Therefore, it is difficult for the ultrasonic wave detection to detect the wire defect inside the clamp in engineering practice.

关 键 词：导线断股 导线夹 超声导波 有限元仿真 

分 类 号：TM755[电气工程—电力系统及自动化] TB553[理学—物理]