NDLI: Properties of YBCO films at high current densities: fault current limiter implications

Content Provider	IEEE Xplore Digital Library
Author	Decroux, M. Antognazza, L. Musolino, N. de Chambrier, E. Reymond, S. Triscone, J.-M. Fischer, O. Paul, W. Chen, M.
Copyright Year	2002
Abstract	We have studied the properties of superconducting strip lines, based on epitaxial YBCO thin films, at high current densities. Experiments performed with short constant current pulses show that a quasi spontaneous highly dissipative state (HDS) appears at high current densities. By carefully measuring the temperature of the YBCO line, we found that its temperature is still below T/sub c/ when the HDS occurs, indicating that this state does not originate from a thermal runaway. Once initiated, this HDS starts to propagate with an initial velocity larger than 100 m/s, which is one order of magnitude higher than thermal velocities. We also applied constant voltage pulses to the YBCO line, therefore simulating a real short circuit. We found that the spatial extent of the HDS along the line, a few microseconds after the short circuit, depends linearly on the applied voltage. These results allow explanation of the fast switching properties observed in superconducting fault current limiters (SFCL) and the fact that the peak current is limited at, typically, 3 times the critical current.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2046
Ending Page	2049
Page Count	4
File Size	401698
File Format	PDF
ISSN	10518223
Volume Number	11
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Yttrium barium copper oxide Current density Fault currents Superconducting epitaxial layers Temperature Voltage Circuits Superconducting films Strips Superconducting thin films
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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