DocumentCode :
1067470
Title :
The Design to Downsize a Conduction-Cooled LTS Pulse Coil for UPS-SMES as Protection From Momentary Voltage Drops
Author :
Kawagoe, Akifumi ; Tsukuda, Shinji ; Sumiyoshi, Fumio ; Mito, Toshiyuki ; Chikaraishi, Hirotaka ; Hemmi, Tsutomu ; Baba, Tomosumi ; Yokota, Mitsuhiro ; Morita, Yoshitaka ; Ogawa, Hideki ; Abe, Ryo ; Nakamura, Akira ; Okumura, Kagao ; Kuge, Atsuko ; Iwakum
Author_Institution :
Kagoshima Univ., Kagoshima
Volume :
17
Issue :
2
fYear :
2007
fDate :
6/1/2007 12:00:00 AM
Firstpage :
1963
Lastpage :
1966
Abstract :
The stability margin of a conduction-cooled LTS pulse coil with stored energy of 1 MJ, which is used for UPS-SMES as protection from momentary voltage drops, is estimated from thermal analyses using the two-dimensional finite elementary method. How much the 1 MJ coil is able to be downsized is discussed. The winding conductor of this coil is a NbTi/Cu Rutherford cable, which is extruded with aluminum. Dyneema FRP and Litz wires are used as the spacers of this coil. In the design of this 1 MJ coil, the effects of spacers were neglected. In order to estimate the stability margin, thermal analyses was carried out by taking into account the thermal effects of spacers, for the coil during overload operation. And it was checked whether the maximum temperature The results showed that the 1 MJ coil has a large stability margin of 8 times the rated ac loss. In addition, new coils with a stability margin of about two times were designed. Possibilities for reducing the size and the cost of a 1 MJ LTS pulse coil are also shown.
Keywords :
copper; niobium alloys; superconducting cables; superconducting coils; superconducting magnet energy storage; superconducting materials; titanium alloys; type II superconductors; uninterruptible power supplies; windings; 2D finite elementary method; Dyneema FRP wires; Litz wires; NbTiCu; Rutherford cable; UPS-SMES; conduction-cooled LTS pulse coil; momentary voltage drop protection; overload operation; stability margin; stored energy; superconducting magnetic energy storage; thermal analysis; uninterruptible power supply; winding conductor; Coils; Conductors; Finite element methods; Niobium compounds; Protection; Stability analysis; Thermal conductivity; Thermal stability; Titanium compounds; Voltage; Conduction cooling; LTS; SMES; pulse coil;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2007.898394
Filename :
4277498
Link To Document :
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