Transactions of China Electrotechnical Society  2016, Vol. 31 Issue (12): 118-125    DOI:
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A Portable Unilateral Nuclear Magnetic Resonance Sensor Used for Detecting the Aging Status of Composite Insulator
Xu Zheng, Wu Jiamin
State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China

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Abstract  In order to quantitatively measure the aging status of the composite insulator with non-destructive method, a new portable unilateral nuclear magnetic resonance (NMR) sensor was designed. The structures of its magnet and radio-frequency coil were optimized. Three composite insulators with different years were tested. The NMR echo signals of the samples were obtained by the nuclear magnetic resonance spectrometer. These NMR echo signals were processed with the mono-exponential fitting method to obtain the equivalent transverse relaxation time T2. The result demonstrates that, as the service year of the insulator increases, the equivalent transverse relaxation time T2 decreases. At the same time, the contact angle method was employed to compare with the NMR method. It shows that T2 and static contact angle have the same changing trend along with the service time, but the T2 parameter changes more obviously than the static contact angle.
Key wordsComposite insulator      aging status detection      unilateral nuclear magnetic resonance      equivalent transverse relaxation time     
Received: 27 May 2014      Published: 12 July 2016
PACS: TH89  
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