Optimal Design of a Portable Arc-Shaped NMR Sensor and Its Application in the Aging-Level Detection of Silicone Rubber Insulator
- Authors: Zheng X.1, Qiang Y.1
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Affiliations:
- State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University
- Issue: Vol 47, No 2 (2016)
- Pages: 175-189
- Section: Article
- URL: https://journals.rcsi.science/0937-9347/article/view/247433
- DOI: https://doi.org/10.1007/s00723-015-0738-4
- ID: 247433
Cite item
Abstract
Silicone rubber insulators (SRIs) are widely used in power systems because of their excellent hydrophobicity, high mechanical strength, and light weight; however, detecting SRI degradation remains problematic. Many studies have focused on SRI detection, but reports on rod-sheath detection are limited. We designed a novel nuclear magnetic resonance sensor that could be used to detect the sheath of arc-shaped SRI rods. First, the magnetic structure that generates the main magnetic field (B0) was designed and optimized, and B0 was designed purposely for an arc-shaped distribution that can match the sheath of SRI rod well. Second, an arc-shaped spiral radio-frequency coil was designed and optimized. Third, three SRIs serving on a 220-kV power transmission line for different time points were measured using this sensor. The transverse-relaxation decay curves were obtained using the Carr–Purcell–Meiboom–Gill (CPMG) sequence. Inverse Laplace transformation was then used to obtain the T2 distribution from the CPMG decay curves. T2 distribution demonstrated that the long component of T2 decreased with increased serving time. Therefore, the T2,long mean obtained from the T2 distribution can be used as an index to reflect the aging level of the sheath of SRI rod.
About the authors
Xu Zheng
State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University
Author for correspondence.
Email: pinexz@163.com
China, Chongqing, 400044
Ye Qiang
State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University
Email: pinexz@163.com
China, Chongqing, 400044