Basic mechanism of self-healing from thermal runaway for uninsulated REBCO pancake coils

被引：85

作者：

Yanagisawa, Y. ^{[1
,2
]}

Sato, K. ^{[1
,2
]}

Yanagisawa, K. ^{[1
,2
]}

Nakagome, H. ^{[2
]}

Jin, X. ^{[1
]}

Takahashi, M. ^{[1
]}

Maeda, H. ^{[1
]}

机构：

[1] RIKEN, Ctr Life Sci Technol, Yokohama, Kanagawa 2300045, Japan

[2] Chiba Univ, Grad Sch Engn, Chiba 2638522, Japan

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2014年 / 499卷

关键词：

REBCO coil; Uninsulated coil; Thermal runaway; Protection; Self-healing;

D O I：

10.1016/j.physc.2014.02.002

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页码：40 / 44

页数：5

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