超声导波检测绝缘子用玻璃钢芯棒缺陷

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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。

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	邓红雷
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	李富才

关键词 ：玻璃钢芯棒, 超声导波, 频散曲线, 缺陷检测, 有限元仿真

Abstract：Statistics showed that the insulator damages caused by fracture of fiber reinforced plastics (FRP) rod accounted for a large proportion in high voltage line serious accidents. For rapid and accurate detection on the defect of FRP rod, this paper presented a new method: ultrasonic guided wave. According to guided wave theory, characteristics of guided wave propagation in FRP rod from 110kV composite insulator were obtained. The frequency of excitation signal used in simulation and experiment was preliminarily determined by the longitudinal and torsional mode dispersion curves of guided wave. Through finite element simulation, waveforms of guided wave propagating in FRP rod with and without defect were presented. Experiment based on theoretical analysis and simulation results was carried out. It is shown that both of 10-cycle 40kHz and 20-cycle 32kHz L(0,1) guided waves could efficiently detect defection in FRP rod, and the former could detect the accurate position of defect while the latter is more suitable for longer FRP rod. Within a certain range, the longer FRP rod is, the more obvious flaw waves are and the better performance of detection is. It is feasible and effective to defect detection of FRP rod from composite insulator with ultrasonic guided wave technology.

Key words： Fiber reinforced plastics rod ultrasonic guided wave dispersion curves defect detection finite element simulation

收稿日期: 2015-08-24 出版日期: 2017-06-30

PACS:

TM835

基金资助: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）和国家自然科学基金（11372179）项目资助

通讯作者: 邓红雷男,1975年生,副教授,研究方向为电力设备在线监测与故障诊断。E-mail: denghl@scut.edu.cn

作者简介: 陈力男,1991年生,硕士研究生,研究方向为电力设备在线监测。E-mail: chenli910426@126.com

引用本文:

邓红雷, 陈力, 鲁强, 戴栋, 李富才. 超声导波检测绝缘子用玻璃钢芯棒缺陷[J]. 电工技术学报, 2017, 32(12): 268-276. Deng Honglei, Chen Li, Lu Qiang, Dai Dong, Li Fucai. Defect Detection for Fiber Reinforced Plastics Rod of Composite Insulator with Ultrasonic Guided Wave. Transactions of China Electrotechnical Society, 2017, 32(12): 268-276.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I12/268

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