NDLI: Development of Low-AC-Loss Bi-2223 Superconducting Multifilamentary Wires

Content Provider	IEEE Xplore Digital Library
Author	Funaki, K. Sasasige, Y. Yanagida, H. Yamasaki, S. Iwakuma, M. Ayai, N. Ishida, T. Fukumoto, Y. Kamijo, H.
Copyright Year	2002
Abstract	We have been designing and developing advanced Ag-sheathed Bi-2223 multifilamentary wires for the future applications to superconducting transformers of electric rolling stocks. Trial wires were twisted without remarkable degradation in the transport property for suppressing AC losses in a perpendicular magnetic field configuration. The AC losses were measured by a saddle-shaped pickup coil in a wide range of frequency up to a commercial frequency. The experimental results show that the AC loss per cycle has linear frequency dependence in a region of the practical amplitude of AC magnetic field for the transformers, where the excess loss may come from an electromagnetic coupling between the filaments. The hysteresis loss evaluated as a low frequency limit of the AC loss was also reduced with the decrease in the twist pitch, which may be considered as a similar effect to the so-called ldquotwist effectrdquo observed in in-situ Nb₃Sn wires.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	3053
Ending Page	3056
Page Count	4
File Size	332262
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	Multifilamentary superconductors Superconducting filaments and wires Magnetic field measurement Superconducting coils Transformers Degradation Magnetic properties Frequency measurement Loss measurement Frequency dependence twist pitch AC loss Bi-2223 wire hysteresis loss transformer of rolling stock
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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