TY - JOUR
T1 - Stability evaluation of a conduction-cooled prototype LTS pulse coil for UPS-SMES
AU - Kawagoe, Akifumi
AU - Sumiyoshi, Fumio
AU - Mito, Toshiyuki
AU - Chikaraishi, Hirotaka
AU - Maekawa, Ryuji
AU - Seo, Kazutaka
AU - Baba, Tomosumi
AU - Henmi, Tsutomu
AU - Okumura, Kagao
AU - Iwakuma, Masataka
AU - Hayashi, Kazuo
AU - Abe, Ryo
PY - 2005/6
Y1 - 2005/6
N2 - The stability of a prototype conduction-cooled LTS pulse coil for UPS-SMES of 100 kJ was evaluated. This coil has been developed as a first step of a project to develop a 1 MW, 1 UPS-SMES to protect semiconductor chip production equipment and nuclear fusion experimental devices, etc, from momentary voltage drop and power failure. The winding conductor is an NbTi/Cu Rutherford cable, which is extruded with aluminum. This conductor has both low AC losses and high stability under specified orientation of changing transverse magnetic fields. The 100 kJ-coil are wound by the new winding method. In order to improve the heat conduction properties in the coil, Dyneema FRP and Litz wires are used as spacers. Litz wires were connected with the cryocooler as cooling paths. On the pulse operation, the operating current is reduced from 1000 A to 707 A in 1 s. In this paper, the thermal properties of the 100 kJ-coil are calculated by finite element method under pulse operation. In order to estimate the stability, a calibration experiment was carried out. Results indicated that our prototype LTS pulse coil has high stability to enable to allow over 10 times as large heat as AC losses.
AB - The stability of a prototype conduction-cooled LTS pulse coil for UPS-SMES of 100 kJ was evaluated. This coil has been developed as a first step of a project to develop a 1 MW, 1 UPS-SMES to protect semiconductor chip production equipment and nuclear fusion experimental devices, etc, from momentary voltage drop and power failure. The winding conductor is an NbTi/Cu Rutherford cable, which is extruded with aluminum. This conductor has both low AC losses and high stability under specified orientation of changing transverse magnetic fields. The 100 kJ-coil are wound by the new winding method. In order to improve the heat conduction properties in the coil, Dyneema FRP and Litz wires are used as spacers. Litz wires were connected with the cryocooler as cooling paths. On the pulse operation, the operating current is reduced from 1000 A to 707 A in 1 s. In this paper, the thermal properties of the 100 kJ-coil are calculated by finite element method under pulse operation. In order to estimate the stability, a calibration experiment was carried out. Results indicated that our prototype LTS pulse coil has high stability to enable to allow over 10 times as large heat as AC losses.
KW - Conduction cooling
KW - LTS
KW - SMES
KW - Stability
UR - http://www.scopus.com/inward/record.url?scp=22044452021&partnerID=8YFLogxK
U2 - 10.1109/TASC.2005.849325
DO - 10.1109/TASC.2005.849325
M3 - Article
AN - SCOPUS:22044452021
SN - 1051-8223
VL - 15
SP - 1891
EP - 1894
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 2 PART II
ER -