Conveners
Thu-Mo-Po.04 - No-Insulation Coils III
- Lorenzo Cavallucci (University of Bologna)
- Vyacheslav Solovyov (Brookhaven Technology Group)
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Mr Hongzhuo Zeng (Institute of Electrical Engineering, Chinese Academy of Sciences)03/07/2025, 08:45Poster
For non-insulated (NI) HTS coils wound with thin REBCO tapes, on the one hand, due to increasing current density, the coils can generate higher magnetic field; on the other hand, the compactness and the mechanical stability of the coils can be improved for the reason of higher proportion of Hastelloy. However, up to now, there is a lack of experimental research data on the electro-thermal...
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Bonghyun Cho (Pusan National University)03/07/2025, 08:45Poster
This paper presents both numerical and experimental investigations aimed at achieving accurate measurements of critical current in no-insulation (NI) high-temperature superconducting (HTS) coils. Leakage currents can flow through the turn-to-turn contact resistance in NI HTS coils. Additionally, screening current-induced voltages become dominant factors during the initial charging process....
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Bonghyun Cho (Pusan National University)03/07/2025, 08:45Poster
No-insulation (NI) high-temperature superconducting (HTS) coils have gained attention for their high overall current density, thermal stability, and mechanical integrity. However, the time constant and the characteristic resistance in NI HTS coils, which are dominantly governed by radial turn-to-turn contact resistances, still require further investigation to examine coil specifications....
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Mr Kevin Tang (Thea Energy, Inc.)03/07/2025, 08:45Poster
To generate the twisted magnetic fields necessary for fusion plasma confinement, stellarators have historically required complex and precise modular coils, which are difficult to manufacture and maintain. In mitigating this challenge, Thea Energy, Inc. is actively developing “Eos”, a planar coil stellarator that can shape the needed magnetic fields using arrays of hundreds of smaller,...
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Dr Andrea Musso (RSE S.p.A., Milan)03/07/2025, 08:45Poster
In the development of high-temperature superconductor (HTS) pancake coils, the no-insulation (NI) is a well-known approach that enables self-protection by allowing radial current redistribution during thermal events. This method, while advantageous for mitigating damage during quench, presents significant challenges due to the low contact resistance, which causes a substantial reduction in the...
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Fangliang Dong03/07/2025, 08:45Poster
In this paper, we present investigation of the impact of the surface shunting on the current and thermal distributions within no-insulation (including metal-insulation) REBCO coils, particularly in relation to quench and overcharge events. The metallic surface shunt serves as an additional current bypass outside of the winding, complementing the turn-turn bypass present inside metal-insulated...
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Erik Schnaubelt (CERN)03/07/2025, 08:45Poster
High-temperature superconductor (HTS) coated conductors (CC) can be wound into no-insulation (NI) pancake coils, i.e., coils without electrical insulation in-between the turns. Along the CC length, the critical current has an inherent variation due to its manufacturing process. This variation causes non-uniform heat generation when the coil is operated at a high fraction of the critical...
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Mr Jeongwoo Seo (Korea Maritime and Ocean University)03/07/2025, 08:45Poster
The no-insulation (NI) winding method is widely known for its ability to improve the stability of high-temperature superconductor (HTS) coils by bypassing the hot spot during a local quench. However, one major drawback of this method is the occurrence of charge and discharge delays due to current leakage between winding turns. To address this limitation, we recently proposed an impregnation...
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Mr Gongxuan Chen (Institute of Electrical Engineering, Chinese Academy of Sciences)03/07/2025, 08:45Poster
The contact resistance of non-insulation high-temperature superconducting (NI HTS) coils is an important parameter to characterize their thermal stability. While numerous discharging experiments have demonstrated that the contact resistance of NI HTS coils is not constant, the real-time evaluation of its transient behavior remains insufficiently explored. This paper proposes a novel inverse...
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Xueliang Wang03/07/2025, 08:45Poster
It has been already revealed that for no-insulation (NI) HTS coils during transient charge and discharge, biased transport current concentrates on the coil terminals, which is closer to the power supply and is less affected by azimuthal current delay effect caused by turn-to-turn current. However, the 3D current density distribution, which considers the terminal effect, is still unclear. Based...
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Xueliang Wang03/07/2025, 08:45Poster
Electromagnetic forces arose from short-circuit impact can cause severe injuries to transformer windings. To alleviate short-circuit force damages, this study proposes a three-phase resistive-type HTS fault current limiter (R-SFCL) design implemented in a power transformer. A field-circuit coupled model is established considering R-SFCL with three-phase non-inductive coils by coupled...
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