超声导波检测绝缘子用玻璃钢芯棒缺陷

发布时间：2018-05-19 08:38

本文选题：玻璃钢芯棒 + 超声导波　；参考：《电工技术学报》2017年12期

【摘要】：统计表明,因芯棒断裂造成绝缘子损坏在高压线路恶性事故中占很大比重。为快速、准确检测绝缘子用玻璃钢芯棒缺陷,提出一种新的检测手段:超声导波检测。以110kV绝缘子用玻璃钢芯棒为研究对象,根据导波理论研究了导波在芯棒中的传播特性,得到了导波纵向和扭转模态的频散曲线,初步确定了仿真和实验所用激励信号的频率范围。通过有限元仿真,得出了导波在有无缺陷芯棒中的波形分布规律。基于理论分析和仿真结果进行了玻璃钢芯棒的导波检测实验,实验结果表明:10周期40kHz和20周期32kHz的L(0,1)模态导波均能较好地检测出芯棒中的缺陷,且前者能较准确地确定缺陷位置,后者更适于较长的芯棒检测;在一定范围内,被检测的芯棒越长,检测效果越好。研究结果为绝缘子用玻璃钢芯棒缺陷检测提供了一种新思路。
[Abstract]:The statistics show that the damage of the insulator caused by the core bar fracture is a large proportion of the high voltage line malpractice. In order to quickly and accurately detect the defects of the FRP core rod used for insulators, a new detection method is proposed: ultrasonic guided wave detection. The 110kV insulators are used as the research object of the FRP mandrel. The guided wave is studied in the mandrel based on the guided wave theory. The dispersion curves of the longitudinal and torsional modes of the guided wave are obtained. The frequency range of the excitation signal used in the simulation and experiment is preliminarily determined. Through the finite element simulation, the waveform distribution law of the guided wave in the defective mandrel is obtained. Based on the theoretical analysis and simulation results, the testing experiment of the guided wave of the FRP mandrel is carried out. The results show that the L (0,1) mode guided waves of 10 period 40kHz and 20 period 32kHz can detect the defects in the core well, and the former can accurately determine the position of the defect, and the latter is more suitable for the longer mandrel detection. In a certain range, the longer the tested mandrel is, the better the detection result. The result of the study is that the insulators are short of glass steel mandrel. The detection of subsidence provides a new way of thinking.
【作者单位】：华南理工大学电力学院;机械系统与振动国家重点实验室(上海交通大学);
【基金】：中央高校基本科研业务费专项资金(2014ZM0031) 国家高技术研究发展计划(863计划)(2012AA050209) 国家自然科学基金(11372179)项目资助
【分类号】：TB559;TM75

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