波谱学杂志2017，Vol.34Issue(2)：223-230,8.DOI:10.11938/cjmr20170212
弧形核磁共振传感器设计及其在复合绝缘子老化状态检测中的应用
An Arc-Shaped NMR Sensor: Design and Application in Measuring the Aging Status of Composite Insulator Rod Sheath
摘要
Abstract
Silicone rubber composite insulators are widely used in the power system because of advantages such as excellent hydrophobicity, high mechanical strength and light weight. Currently the methods for accuracy and effective analysis of the aging status of the composite insulators are still lacking. Although previous studies have investigated the degradation of composite insulator shied, none of them focused on composite insulator rod sheath. To measure the aging status of rod sheath, a nuclear magnetic resonance (NMR) sensor was designed, which could be applied to arc-shaped samples. The magnet structure was optimized to have a main magnetic field distribution matching up with the curvature of the rod sheath. A flexional helical radio frequency transmission coil was designed and optimized. The sensor was applied to three kinds of rod sheath with different ages. A CPMG pulse sequence was used to acquireT2 relaxation curves of the samples, which were then subjected to an inverse Laplace transformation to obtainT2 spectrum. The result showed that the T2 of the rod sheath decreased with increasing operation time. It is concluded that the parameterT2, long mean calculated from theT2 spectrum can be used for measuring the aging status of rod sheath.关键词
便携核磁共振传感器/高压复合绝缘子/电老化/无损测量Key words
portable nuclear magnetic resonance sensor/high voltage composite insulator/electrical aging/non-destructive measurement分类
数理科学引用本文复制引用
刘社民,叶强,黄桥林,盛从兵,冯盼增,李俊防,吴嘉敏,徐征..弧形核磁共振传感器设计及其在复合绝缘子老化状态检测中的应用[J].波谱学杂志,2017,34(2):223-230,8.基金项目
国家自然科学基金资助项目(51377182),国网河南省电力公司科技项目(5217E01504XD). （51377182）
