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.
徐, 征, 吴嘉敏. 用于复合绝缘子伞裙老化状态检测的单边核磁共振传感器[J]. 电工技术学报, 2016, 31(12): 118-125.
Xu Zheng, Wu Jiamin. A Portable Unilateral Nuclear Magnetic Resonance Sensor Used for Detecting the Aging Status of Composite Insulator. Transactions of China Electrotechnical Society, 2016, 31(12): 118-125.
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