期刊
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
卷 499, 期 -, 页码 40-44出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physc.2014.02.002
关键词
REBCO coil; Uninsulated coil; Thermal runaway; Protection; Self-healing
资金
- Grants-in-Aid for Scientific Research [25289070] Funding Source: KAKEN
This paper clarifies the basic mechanism of self-healing from natural thermal runaway for uninsulated REBCO pancake coils. Based on the numerical simulation and experimental results, it is demonstrated that current flow patterns for an uninsulated REBCO pancake coil sequentially changes with the over-current value. Due to natural thermal runaway above the coil critical current, the current flow changes from multi-turn-coil mode to single-turn-coil mode, reducing the conductor current density and Joule heating, and thus the thermal runaway shrinks and the coil is self-healed; i.e. the REBCO coil is self-protected. For higher overcurrents, however, transverse currents across both electrodes become dominant, here called terminal-to-terminal current mode. It is dangerous for REBCO coils as the winding volume connecting both electrodes is extremely overheated, damaging the conductor winding. (C) 2014 Elsevier B. V. All rights reserved.
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