Self-Protection Characteristic Comparison between No-Insulation, Metal-as-Insulation, and Surface-Shunted-Metal-as-Insulation REBCO coils.
Self-Protection Characteristic Comparison between No-Insulation, Metal-as-Insulation, and Surface-Shunted-Metal-as-Insulation REBCO coils.
复制标题
无绝缘、金属绝缘和表面分流金属绝缘 REBCO 线圈的自保护特性比较。
DOI：
10.1109/tasc.2023.3267727
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Iwasa,Yukikazu
中科院分区：
文献类型：
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作者：
Kim,Junseong;Park,Dongkeun;Dong,Fangliang;Lanzrath,Andrew;Lee,Wooseung;Bascuñán,Juan;Iwasa,Yukikazu
金属带共绕组或金属作为绝缘（MI）绕组方法是一种改善机械性能和降低平均电流密度的极好方法，从而降低高场REBCO磁体的应力，同时又不完全失去无绝缘（NI）绕组方法的优点。然而，MI绕组增加了匝间的电阻，这被称为特性电阻。增加的特性电阻可以在异常过渡情况下降低旁路电流，例如淬火，这从磁铁保护的角度来看可能是不可取的。为了同时利用MI和NI绕组的优势，降低MI绕组线圈特性电阻的一个可能的解决方案是在线圈的绕组表面上增加一个分流器。我们称这种方法为表面分流金属绝缘（SSMI）。在本报告中，我们比较了NI， MI和SSMI之间的特征电阻及其相关的自我保护特性。本文介绍了在相同的绕组压力为20 n的情况下，采用NI、MI和SSMI三种不同的绕制方法对单个煎饼线圈的测试结果，特别研究了SSMI方法对特性电阻的影响。
The metal tape co-winding or a metal-as-insulation (MI) winding method is an excellent way to improve the mechanical properties and reduce the average current density, thereby decreasing the stress in high-field REBCO magnet without completely losing the benefits of the no-insulation (NI) winding method. However, the MI winding increases the resistance between turns, which is known as characteristic resistance. The increased characteristic resistance can reduce the bypass current during abnormal transition situation, such as quench, which may not be desirable from a magnet protection point of view. To take advantage of both the MI and NI winding, one possible solution to reduce characteristic resistance of the MI winding coils is to add a shunt on top of the winding surface of the coil. We call this method surface-shunted-metal-as-insulation (SSMI). In this presentation, we compare the characteristic resistances and their correlated self-protecting characteristics between NI, MI, and SSMI. We present the test results of single pancake coils which wound using different winding methods (NI, MI, and SSMI) with same winding pressure of 20 N. In particular, we investigated how the SSMI method affects the characteristic resistance.