Summary of a 1 MJ Conduction-Cooled LTS Pulse Coil Developed for 1 MW, 1 s UPS-SMES

The development study of a 1 MJ conduction-cooled low temperature superconducting (LTS) pulse coil used for a 1 MW, 1 s UPS-SMES is summarized. We have developed a conduction-cooled LTS pulse coil as a key technology for the UPS-SMES. The AC loss reduction and the high stability are required for the...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2009-06, Vol.19 (3), p.1999-2003
Main Authors: Mito, T., Chikaraishi, H., Kawagoe, A., Maekawa, R., Abe, R., Baba, T., Okumura, K., Kuge, A., Iwakuma, M., Sumiyoshi, F.
Format: Article
Language:English
Subjects:
Air conditioning
Applied sciences
Coiling
Coils (windings)
Conduction cooled
Conductors
Conductors (devices)
Cooling
Copper
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electromagnets
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Energy accumulation
Exact sciences and technology
LTS
Niobium compounds
Power electronics, power supplies
pulse coil
Stability
Strands
Superconducting coils
Temperature
Testing
Titanium compounds
UPS-SMES
Various equipment and components
Winding
Wire
Wires
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Summary:The development study of a 1 MJ conduction-cooled low temperature superconducting (LTS) pulse coil used for a 1 MW, 1 s UPS-SMES is summarized. We have developed a conduction-cooled LTS pulse coil as a key technology for the UPS-SMES. The AC loss reduction and the high stability are required for the SC conductor for a LTS pulse coil because of a limited cooling capacity of 4 K cryocooler. The conductor of a NbTi/Cu compacted strand cable extruded with an aluminum was designed to have the anisotropic AC loss properties to minimize the coupling loss. The coil was wound, utilizing a specially developed automatic winding machine which enables an innovative twist-winding method. The Dyneema FRP (DFRP) spacers and the Litz wires (braided wires of insulated copper strands) were inserted in each layer in order to enhance the heat transfer in the coil windings. The coil was installed in the test cryostat and was connected to three GM cryocoolers, which have a total cooling capacity of 4.5 W at 4 K and 240 W at 50 K. The coil was cooled conductively without liquid helium by attaching the end of the Litz wires directly to the cold heads of the cryocoolers. The cooling and excitation test of the 1 MJ coil has been done successfully. The test results validated the high performance of the conduction-cooled LTS pulse coil, because the high thermal diffusivity resulted in the rapid temperature stabilization in the coil.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2009.2018480