| Autor: |
Miyashita, Katsumi, Sato, Hiroyuki, Arika, Mitsuhiro, Takahashi, Ryukichi |
| Předmět: |
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| Zdroj: |
Electrical Engineering in Japan; Aug2006, Vol. 156 Issue 3, p24-31, 8p, 4 Black and White Photographs, 4 Diagrams, 3 Charts, 6 Graphs |
| Abstrakt: |
The NbTi superconducting strands and cables for the field winding of the 200-MW-class high-energy-density-type superconducting generator are developed. They are composed of Cu/Cu-10wt%Ni/Nb-46.5wt%Ti superconducting strands and the 10-kA (at 5 T)-class 9-strand compacted cables. The diameter of strands is 1.33 mm, and the 9-strand compacted cables are 2.4 mm thick and 6.0 mm wide. In order to produce high-current-density NbTi strands, we made strands under controlled aging heat treatments, the total and final strains, and the strains between heat treatments, by using large-scale extruder. Moreover, in order to produce high-stability and low-AC-loss NbTi strands and cables, the matrix ratio of strands and the cross sections of strands are optimized. The current density of NbTi filaments for the four-time-aging manufactured 1.33-mm-diameter strands was JC=3150 A/mm2 at 5 T, 1150 A/mm2 at 8 T. The critical current of the 9-strand compacted cable is 10.7 kA at 5 T. The AC losses of the final compacted cables are less than 100 kW/m3 at 5 T, 5 T/s, that is, decreased to less than half of the target of the AC loss value (< $\ 200 \hbox{ kW/m}^{3}$ at 5 T, 5 T/s). Compared with the strand (Cu ratio 1.77), the minimum quench energy (MQE) of the strand (Cu ratio>2) increased about 40% at the operation mode current of the superconducting generator. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 156(3): 24– 31, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20266 [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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