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A Portable NMR Sensor Used for Assessing the Aging Status of Silicone Rubber Insulator

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Abstract

A portable nuclear magnetic resonance (NMR) sensor with an adjustable ‘clamp’ structure is constructed for the noninvasive measurement of the aging status of silicone rubber insulators used in the high-voltage power transmission. The Carr–Purcell–Meiboom–Gill sequence was employed to record the 1H NMR transverse relaxation curves of silicone rubber insulators with different service times. The decay curves were fitted to mono-exponential and bi-exponential functions. Further data processing of the decay curves was performed with the inverse Laplace transformation for one-dimensional T 2 distribution analysis, focusing on the mean lifetime of the long T 2 component (T 2long mean). The results demonstrate that an increase in the aging level of the insulator clearly results in a decrease of T 2long mean. For comparison, the relative permittivity of the insulator was also measured. It shows the same trend as that of T 2long mean. This indicates that the T 2long mean relaxation time obtained from our portable NMR sensor can reliably be used as an index to reflect the aging status of silicone rubber insulator.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 51107150 and 51377182). We thank Dr. Bryce MacMillan for his help in paper writing. Xu Zheng thanks Mr. Gan Qiang of Jiangsu electric power company for supplying the insulators.

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Authors and Affiliations

  1. State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing, 400044, China

    Zheng Xu, Shujie Zhao & Pan Guo

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  1. Zheng Xu
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  2. Shujie Zhao
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  3. Pan Guo
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Correspondence to Zheng Xu.

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Xu, Z., Zhao, S. & Guo, P. A Portable NMR Sensor Used for Assessing the Aging Status of Silicone Rubber Insulator. Appl Magn Reson 44, 1405–1417 (2013). https://doi.org/10.1007/s00723-013-0489-z

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  • DOI: https://doi.org/10.1007/s00723-013-0489-z

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