NDLI: Degradation Characteristics of YBCO-Coated Conductors Subjected to Overcurrent Pulse

Content Provider	IEEE Xplore Digital Library
Author	Ishiyama, A. Nishio, Y. Ueda, H. Kashima, N. Mori, M. Watanabe, T. Nagaya, S. Yagi, M. Mukoyama, S. Machi, T. Shiohara, Y.
Copyright Year	2002
Abstract	YBCO tapes are expected to be used in future high temperature superconducting (HTS) applications because of their good J _c characteristics at high temperatures and in high applied magnetic fields. In applications to electric power devices such as transmission cables, transformers, and fault current limiters, the HTS conductors will be subjected to short-circuit fault currents that are 10 to 30 times the normal operating current. These overcurrents are greater than the critical current, and degrade or burn-out the HTS conductors. Therefore, it is important to clarify the mechanism of the degradation caused by such overcurrent pulses. We carried out preliminary experiments on damage caused by overcurrent pulse drive, focusing on the temperature limitation without suffering degradation for overcurrent pulse operation. A 10-mm-wide YBCO tape was cut into 2-mm-wide sample tapes by a laser beam, and the sample tapes were soldered on silver-deposited 100-mum-thick copper plates. Overcurrent tests were carried out on these sample tapes and I_c degradation was investigated. In addition the contact interface between YBCO and the Ag layer or buffer layer before and after the overcurrent drives has been investigated in order to clarify the correlation between the degradation and delamination of sample tapes.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	3483
Ending Page	3486
Page Count	4
File Size	851603
File Format	PDF
ISSN	10518223
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Degradation Conductors High temperature superconductors Yttrium barium copper oxide Superconducting cables Laser beam cutting Pulse transformers Superconducting films Magnetic fields Fault current limiters YBCO tape overcurrent pulse temperature limitation
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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