Partial-Insulation HTS Magnet for Reduction of Quench-Induced Peak Currents.
Partial-Insulation HTS Magnet for Reduction of Quench-Induced Peak Currents.
复制标题
部分绝缘高温超导磁体，用于减少淬火引起的峰值电流。
DOI：
10.1109/tasc.2022.3156064
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发表时间：
2022
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：
Lee,Wooseung;Park,Dongkeun;Bascuñán,Juan;Iwasa,Yukikazu
当线圈中出现热点时，非绝缘（NI）线圈的匝间电流路径通过迫使电流旁路到附近的匝来防止局部加热。然而，通过旁路改变电流方向会改变磁通量，从而在多层堆叠的高温超导磁体的相邻线圈中产生不必要的感应电流。这种感应电流可以暂时超过NI线圈中设计的最大电流，从而损坏磁铁。部分绝缘（PI）线圈，在绕组之间插入单个或多个绝缘材料，用聚酰亚胺类材料或薄陶瓷薄膜，以阻碍电流路径，可以降低NI高温超导线圈电流路径中的感应电流峰值。在本文中，我们给出了用双烧饼对PI高温超导磁体淬火时的峰值感应电流的模拟研究结果。研究表明，感应电流峰值随绝缘匝数的变化而变化。我们还讨论了感应电流逐匝仿真。仿真结果表明，PI有效地降低了总感应电流，特别是每两匝加绝缘。
The No-insulation-like (NI) coil’s turn-to-turn current paths prevent local heating by forcing the current to bypass into nearby turns when a hot spot appears in a coil. However, the changing direction of the current by bypassing will change the magnetic flux, which generates unwanted induced currents in the adjacent coils in a multiply-stacked HTS magnet. This induced current can temporarily exceed the designed maximum currents in the NI coils, damaging the magnet. A partial-insulation (PI) coil, in which a single or multiple insulated, with a polyimide-like material or a thin ceramic film, is inserted between windings to hinder the current paths, can reduce the peak induced currents in the NI HTS coil’s current paths. In this paper, we present the results of a simulation study on the peak-induced current upon a quench of the PI HTS magnet with a double pancake. The study shows that the peak-induced current varies with the number of insulated turns. We also discuss the induced current turn-by-turn simulation. According to the simulation result, the PI effectively reduces overall induced current, especially insulation applied every two turns.