DocumentCode :
1144837
Title :
AC Losses in a Conduction-Cooled LTS Pulse Coil With Stored Energy of 1 MJ for UPS-SMES as Protection From Momentary Voltage Drops
Author :
Kawagoe, A. ; Tsukuda, S. ; Sumiyoshi, F. ; Mito, T. ; Chikaraishi, H. ; Baba, T. ; Yokota, M. ; Ogawa, H. ; Hemmi, T. ; Abe, R. ; Nakamura, A. ; Okumura, K. ; Kuge, A. ; Iwakuma, M.
Author_Institution :
Kagoshima Univ., Kagoshima
Volume :
18
Issue :
2
fYear :
2008
fDate :
6/1/2008 12:00:00 AM
Firstpage :
783
Lastpage :
786
Abstract :
AC losses in the conduction-cooled low temperature superconducting (LTS) pulse coil with stored energy of 1 MJ are estimated. The 1 MJ coil is a superconducting pulse coil for 1 MW, 1 sec UPS-SMES. UPS-SMES is an uninterruptible power supply (UPS) with superconducting magnetic energy storage (SMES) for protection of production lines of an industrial plant or large-scale experimental devices such as a fusion device, from a momentary voltage drop and an instant power failure. The winding conductor for the 1 MJ coil is a NbTi/Cu Rutherford cable, which is extruded with aluminum. The 1 MJ coil was wound by a new twist winding method. A 1 MJ coil was fabricated and cooling and excitation tests were carried out. In this paper, two methods to estimate ac losses in conduction-cooled LTS coils are proposed. One method estimates ac losses in the coil under steady-state conditions. The other method estimates ac losses in the coil under transient-state conditions. For estimation of ac losses in the 1 MJ coil, measurement of temperature in the coil during tests and thermal analysis using the two-dimensional finite element method are compared. These procedures clarified that the 1 MJ coil has low losses.
Keywords :
electric potential; finite element analysis; protection; superconducting coils; superconducting magnet energy storage; uninterruptible power supplies; AC losses; UPS-SMES; conduction-cooled LTS pulse coil; energy 1 MJ; fusion device; industrial plant; instant power failure; low temperature superconducting; momentary voltage drops; power 1 MW; production lines protection; superconducting magnetic energy storage; temperature measurement; thermal analysis; twist winding method; two-dimensional finite element method; uninterruptible power supply; AC loss; NbTi; SMES; conduction-cooled; pulse coil;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2008.921301
Filename :
4497938
Link To Document :
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