R and D of superconductors for 70MW class generators

Journal Article · Mon Jul 01 04:00:00 EDT 1996 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.511345· OSTI ID:287643

Chiba, Hiroki; Uno, Naoki; Ichikawa, Tatsumi ^[1]; Meguro, S; Takahashi, K; Saitou, T; Sakai, S; Akita, S

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1. Engineering Research Association for Superconductive Generation Equipment and Materials, Osaka (Japan)

Super-GM has been developing 70MW class superconducting generators (model machines) for 200MW class pilot generator. Three types of NbTi conductors were developed for each of three model machines. Regarding to the high stability type conductors, residual resistance value of 6.5{micro}{Omega}/m was achieved by adopting Al stabilizer. Regarding to the high current density type, Ic of 13.8kA at 5T was realized by reducing void fraction in conductors and maintaining high residual resistivity ratio. For the low AC loss type, high Jc and low AC loss (8.1kW/m{sup 3}) have been succeeded by applying strand insulation and two stage cabling. To confirm superconducting characteristics concerning long-term reliability, Ic and AC loss of each conductors were measured under 10,000 times repeated compressive force of 30MPa that is supposed in daily start and stop operation of generator for 30 years. In parallel to the R and D of NbTi conductors, R and D of Nb{sub 3}Sn conductors were also conducted for enhancement of critical current density and critical magnetic field.

• OSTI ID: 287643
• Report Number(s): CONF-950691--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 4Pt1 Vol. 32; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
ALUMINIUM
CRITICAL CURRENT
CRITICAL FIELD
ENERGY LOSSES
NIOBIUM ALLOYS
RESEARCH PROGRAMS
STABILIZATION
SUPERCONDUCTING GENERATORS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TIN ALLOYS
TITANIUM ALLOYS