NDLI: Thermal Stability of Conduction-Cooled YBCO Pancake Coil

Content Provider	IEEE Xplore Digital Library
Author	Miyazaki, H. Iwai, S. Tosaka, T. Tasaki, K. Hanai, S. Urata, M. Ioka, S. Ishii, Y.
Copyright Year	2002
Abstract	When a high-temperature superconducting (HTS) coil is operated using a conduction-cooling technique, the coil should be impregnated with epoxy resin because the coil is not sufficiently cooled without it. On the other hand, it is important that the coil should have no damaged area in the winding because the damaged area would generate heat locally and the coil would eventually quench. However, whenever we fabricated an impregnated HTS coil wound with YBCO tapes and evaluated its V-I characteristics, the n-value of the coil was much lower than we expected, indicating that the critical currents of some areas in the winding drastically decreased. Therefore, we have started to improve the performance of an impregnated HTS coil wound with YBCO tapes. In this paper, we investigated the cause of the degradation and found that the degradation did not occur when we decreased the radial tensile stress in the windings. Then we fabricated four single-pancake coils, stacked them, and tested them in a conduction-cooled condition. The measured V-I curves were in good agreement with the calculated ones, suggesting that we successfully developed a technique of fabricating an impregnated HTS coil wound with YBCO tapes with no degradation. We also measured thermal runaway currents of a conduction-cooled HTS coil composed of two single-pancake coils wound with YBCO tapes and numerically simulated the thermal properties by using a three-dimensional heat conduction equation in order to study the thermal stability of the YBCO coil. The measured thermal runaway currents were in good agreement with the calculated ones.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2453
Ending Page	2457
Page Count	5
File Size	884114
File Format	PDF
ISSN	10518223
Volume Number	21
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coils Yttrium barium copper oxide Thermal stability Windings Temperature measurement Thermal conductivity Tensile stress YBCO coil Conduction-cooled degradation thermal runaway
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Degradation-Free Impregnated YBCO Pancake Coils by Decreasing Radial Stress in the Windings and Method for Evaluating Delamination Strength of YBCO-Coated Conductors

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Quench Detection and Protection of Cryocooler-Cooled YBCO Pancake Coil for SMES

Study on Thermal Stability of Conduction-Cooled HTS Coil

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