TY - JOUR
T1 - AC losses in a conduction-cooled LTS pulse coil with stored energy of 1 MJ for UPS-SMES as protection from momentary voltage drops
AU - Kawagoe, A.
AU - Tsukuda, S.
AU - Sumiyoshi, F.
AU - Mito, T.
AU - Chikaraishi, H.
AU - Baba, T.
AU - Yokota, M.
AU - Ogawa, H.
AU - Hemmi, T.
AU - Abe, R.
AU - Nakamura, A.
AU - Okumura, K.
AU - Kuge, A.
AU - Iwakuma, M.
N1 - Funding Information:
Manuscript received August 28, 2007. This work was supported in part by NIFS under NIFS05ULAA102, by a Grant from NEDO, and by the Grant-in aid for Scientific Research 16206028. A. Kawagoe, S. Tsukuda, and F. Sumiyoshi are with Kagoshima University, 1-21-40 Kagoshima, 890-0065, Japan (e-mail: [email protected]. jp). T. Mito, H. Chikaraishi, T. Baba, M. Yokota, and H. Ogawa are with the National Institute for Fusion Science, Toki, Gifu, 509-5292, Japan. H. Hemmi is with Japan Atomic Energy Agency, Naka, Ibaragi, 311-0193, Japan. R. Abe and A. Nakamura are with Shibuya Kogyo Co., Ltd., Mameda-hon-machi, Kanazawa, 920-8681, Japan. K. Okumura and A. Kuge are with the Technova Inc., Chiyoda-ku, Tokyo 100-0011, Japan. M. Iwakuma is with Kyusyu University, Higashi-ku, Fukuoka 812-8581, Japan. Digital Object Identifier 10.1109/TASC.2008.921301
PY - 2008/6
Y1 - 2008/6
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/45149102465
UR - https://www.scopus.com/pages/publications/45149102465#tab=citedBy
U2 - 10.1109/TASC.2008.921301
DO - 10.1109/TASC.2008.921301
M3 - Article
AN - SCOPUS:45149102465
SN - 1051-8223
VL - 18
SP - 783
EP - 786
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 2
M1 - 4497938
ER -