The Method to Diagnose Soundness of The High Temperature Superconducting Coil by Pick-up Coil Pairs
The Method to Diagnose Soundness of The High Temperature Superconducting Coil by Pick-up Coil Pairs
复制标题
利用拾波线圈对诊断高温超导线圈完好性的方法
DOI：
10.1109/tasc.2019.2905982
复制
发表时间：
2019
影响因子：
1.8
通讯作者：
Tsuruda Junya
中科院分区：
文献类型：
--
作者：
Kawagoe Akifumi;Hosoda Keita;Tsuruda Junya
我们提出了一种利用感应线圈对来检测高温超导（HTS）线圈中的正常跃迁的新系统，该系统应用于高磁场磁体，中小企业，变压器等多种应用。在之前的研究中，我们已经证明，即使变压器正在运行，我们的系统也可以检测到由Bi-2223多丝胶带缠绕的测试变压器绕组中的局部正常过渡。然而，对于实际设备的操作来说，检测正常的过渡是不够的，因为在实际操作中不允许突然中断。在实际超导器件的实际运行中，监测和诊断线圈的稳健性（如临界电流）是非常重要的。本文研究了系统测得的外部磁场和温度对信号的依赖关系，以便从信号中诊断绕组的可靠性。结果表明，在交流工况下，绕组的临界电流可以作为稳健性的指标来估计。样品线圈的直径为70毫米。结果表明，根据实测信号可以估计出绕组的临界电流。
We have proposed a new system using pick-up coil pairs to detect normal transitions in the high temperature superconducting (HTS) coils which are applied to several applications, high field magnets, SMES, transformer, and so on. In the previous study, we have demonstrated that our system can detect local normal transitions in the winding of the test transformer wound by Bi-2223 multifilamentary tapes even if the operation of the transformer is ongoing. However, it is not sufficient to detect normal transitions for operations of practical devices because sudden breaks are not allowable for practical operation. It is important that soundness of the coil, such as critical currents, are monitored and diagnosed for actual operation of practical superconducting devices. In this paper, the external magnetic fields and temperature dependences of signals measured by our system are investigated, in order to make possible to diagnose soundness of the windings from the signals. And then it is shown that critical current of the windings, as an indicator of soundness, can be estimated under ac operation. The diameter of the sample coil is 70 mm. The results indicate that the critical currents of the winding can be estimated from our measured signals.