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    Portable Non-Destructive Magnetic Resonance Sensor for Assessing the Aging Status of Silicon Rubber Insulators

    Year: 2022

    Journal: Nanomaterials, Volume 12, NOV

    Authors: Guo, Pan; Wang, Liling; Wang, Rui; Li, Bing; Zhao, Zhirui

    Organizations: National Natural Science Foundation of China [51707028]; Chongqing Natural Science Foundation [cstc2021jcyj-msxmX0470]; Science and Technology Funds of Chongqing Municipal Education Commission [KJQN202100533]; National innovation and entrepreneurship Training Program for college students [202210637013]

    Keywords: silicone rubber insulators (SRIs); nuclear magnetic resonance (NMR); aging detection; portable sensor; non-destructive detection

    Silicone rubber insulators (SRIs) are widely used in high-voltage power grids. Due to high-voltage fields and harsh environmental conditions, SRIs eventually deteriorate with use in the power grid, decreasing their insulating performance and operational life and contributing to transmission line failures. Therefore, quantitatively assessing the aging status of SRIs is crucial. In this study, we evaluated the viability of the magnetic resonance method for assessing the age of SRIs at the level of chemical structure; we built and made a portable magnetic resonance sensor, and evaluated the sensor's functionality. By measuring the SRI sheds at various service times, it was discovered that the equivalent transverse relaxation time, T-2eff, can describe the degree of aging of the SRIs. The results of the magnetic resonance measurements were also compared with those of the static contact angle method, and the two measurement methods yielded the same conclusions. However, the magnetic resonance method was more sensitive than the one using the static contact angle method.
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