Critical current and AC loss measurements of superconductors developed for the Super-GM project under cyclic mechanically loaded condition

Akita, S.; Torri, S.; Kasahara, H.; Uyeda, K.; Ikeno, Y.; Ogawa, Tomoya; Yamaguchi, Kazuyuki; Nakanishi, Kazuo; Nakamura, Shirou; Meguro, S.; Ban, Masashi; Takahashi, Kenichi; Sakai, S.

doi:10.1109/77.233687

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…The A.C.loss has measured by the testing facility at AKAGI Testing Center of Central Research Institute of Electric Power Industry (CRIEPI), which was jointly developed by Super-GM and CRlEPI [3]. This facility can allow us to measure A.C.loss of conductor under circumstances which simulate actual rotor conditions.…”

Section: B a C Loss Measurementmentioning

confidence: 99%

Development of a double stranded cable superconductor for 70 MW class superconducting generator with quick response type

Takigami

Nakanishi

Nakamura

et al. 1995

IEEE Trans. Appl. Supercond.

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Abstruc+We have been developing a 70 M W class model generator aiming at a 200 MW class pilot machine. The superconductor developed for field winding of generator has a configuration of double stranded cable, composed of NbTi, Cu and CuNi. The strand is insulated by formvar and seven strands make a 1st stage cable. Eleven 1st stage cables make a 2nd stage cable, and are compacted to rectangular cross section. The inter -strand resistance and A.C.loss of superconductors are measured under the conditions of compressive mechanical force up to 19.6 MPa to simulate the centrifugal force of the generator rotor winding. From those results, we consider the relation between inter -strand resistance and inter -strand coupling loss. Based on those results, ,we are designing the superconductors for the 70 MW class model generator with quick response, taking the insulation of the strand into account.

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Section: B a C Loss Measurementmentioning

confidence: 99%

Development of a double stranded cable superconductor for 70 MW class superconducting generator with quick response type

Takigami

Nakanishi

Nakamura

et al. 1995

IEEE Trans. Appl. Supercond.

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Critical currents of Nb/sub 3/Sn superconductors for generators under cyclic mechanical load

et al. 1994

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R&D of superconductors for 70 MW class generators

Chibe¹,

Uno²,

Ichikawa³

et al. 1996

IEEE Trans. Magn.

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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 6.5pQ/m was achieved by adopting AI stabilizer.Regarding to the high current density type, IC of 13.81~4 at 5T was realized by reducing void fraction in conductors and maintaining high residual resistivity ratio. For the low AC loss type, high J c and low AC loss (8.1kW/m3) 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&D of NbTi conductors, R&D of Nb3Sn conductors were also conducted for enhancement of critical current density and critical magnetic field.

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Critical current and AC loss measurements of superconductors developed for the Super-GM project under cyclic mechanically loaded condition

Cited by 4 publications

References 5 publications

Development of a double stranded cable superconductor for 70 MW class superconducting generator with quick response type

Development of a double stranded cable superconductor for 70 MW class superconducting generator with quick response type

Critical currents of Nb/sub 3/Sn superconductors for generators under cyclic mechanical load

R&D of superconductors for 70 MW class generators

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