NDLI: Properties of an Experimental Coil Wound With YBCO Coated Conductor Carrying an AC Current With Frequencies up to 864 Hz

Content Provider	IEEE Xplore Digital Library
Author	Polak, M. Barnes, P.N. Kvitkovic, J. Levin, G.A. Mozola, P. Usak, P.
Copyright Year	2002
Abstract	To study the properties of coils made out of the second generation superconducting wire, we designed, manufactured and tested an experimental double pancake coil wound with 4.2 meters of a 4 mm wide, copper stabilized YBCO coated conductor. The critical current of a short sample was 53 A at 77 K in self-field. The critical current of the single pancake coil based on the 1 V/cm criterion for the average electric field was approximately 30 A. The critical current of the complete double pancake was about 23 A. Using micro Hall probes, we measured the radial magnetic field component at the edges of the coil. The results clearly indicated the strong influence of the magnetization currents on the magnitude and distribution of the radial field component. AC losses in the coil were measured at frequencies of 54 Hz, 108 Hz, 216 Hz, 432 Hz and 864 Hz. At the critical current (16.2 A) and frequency 432 Hz the coil losses were 0.9 W. The magnetic measurements showed that the tape in the winding is exposed to a very inhomogeneous magnetic field. The experimental results of the field distribution in the winding were compared with the existing theoretical models.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1240
Ending Page	1244
Page Count	5
File Size	206581
File Format	PDF
ISSN	10518223
Volume Number	18
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wounds Yttrium barium copper oxide Conductors Frequency Superconducting coils Critical current Magnetic field measurement Current measurement AC generators Superconducting filaments and wires magnetic fields AC superconducting coils heating losses
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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