Development of a 500 kVA-class oxide-superconducting power transformer operated at liquid-nitrogen temperature

Funaki, K.; Iwakuma, Masataka; Komori, Kazuhiro; Takeo, M.; Suehiro, Junya; Hara, Masanori; Yamafuji, Kaoru; Konno, Masayuki; Kasagawa, Yusuke; Okubo, Kenji; Yasukawa, Y.; Nose, S.; Ueyama, M.; Hayashi, Kazuhiko; Sato, K.

doi:10.1016/s0011-2275(97)00134-3

Cited by 77 publications

(28 citation statements)

References 5 publications

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“…The parameter is determined by the properties of the workpiece, so the remaining option is to lower . Using HTS in the coil windings emerges as an interesting approach, especially viewed in the light of the construction of a 500 kVA HTS power transformer operating with an overall efficiency of 99.3% (cooling penalty factor included) [4]. Loss reduction is considered a major driving force for developing HTS transformers, but as indicated above, the potential for efficiency improvements is far greater in some induction heaters.…”

Section: Induction Heating Of Extrusion Billetsmentioning

confidence: 99%

Design, building and testing of a 10 kW superconducting induction heater

Runde

Magnusson

2003

IEEE Trans. Appl. Supercond.

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Conventional 50 60 Hz induction heaters for aluminum billets have very large losses. By replacing the copper windings with windings of high-temperature superconducting (HTS) tapes, there is a substantial potential for efficiency improvements, especially if low ac loss HTS tapes become available. To examine the feasibility of using HTS in induction heaters, a first, small-scale working model has been designed and built. The induction coil is made of 24 double pancake coils of Bi-2223/Ag tapes. In the initial test, a workpiece of aluminum situated in the warm bore of the coil was heated up to 300 C.

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Section: Induction Heating Of Extrusion Billetsmentioning

confidence: 99%

Design, building and testing of a 10 kW superconducting induction heater

Runde

Magnusson

2003

IEEE Trans. Appl. Supercond.

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“…Also, HTS devices are important components in future smart grids, and more and more attention is internationally paid to them. At present, many HTS apparatuses, such as cable, transformer, fault current limiter (FCL), superconducting magnetic storage (SMES), are demonstrated in live-grid [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], among which the HTS cable has operated for long term in power grid [16].…”

Section: Introductionmentioning

confidence: 99%

Progress in inhomogeneity of critical current and index n value measurements on HTS tapes using contact-free method

Wang

Guan

Zhang

et al. 2010

Sci. China Technol. Sci.

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The development of high temperature superconducting (HTS) tapes has recently made great progress, and Bi-based tapes (1 G) and YBCO coated conductor (2 G) are commercially fabricated with practical length. Application of HTS in electric power apparatuses made important achievement, various superconducting devices were demonstrated in grid, laying solid foundation for their commercialization. However, since their intrinsic microscopic defects such as weak-link, granularity, small second phase likely exist, critical current and index n value of the HTS tapes in practical length are impossible homogeneous, which have significant influences on safety, stability and efficiency of the HTS apparatuses. Therefore, critical current and index n value are two important parameters describing inhomogeneity of HTS tapes, thus two important indices for evaluating quality of practical long HTS tapes. This paper focuses on main progresses in inhomogeneity of critical current and index n value measurements on HTS tapes using contact-free methods. The statistical analytical methods evaluating the inhomogeneity of critical current and index n value are suggested. They can provide essential references for design and operation of HTS apparatuses.critical current, contact-free measurement, high temperature superconducting (HTS) tapes, index n value Citation:Wang Y S, Guan X J, Zhang H Y, et al. Progress in inhomogeneity of critical current and index n value measurements on HTS tapes using contact-free method.

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“…In recent years, practical HTS tapes have been realized commercially and made great progress in electrical power application [1]. Applications such as HTS cables [2,3], transformers [4][5][6], fault current limiters (FCL) [7,8], generators and motors [9], and superconducting magnetic energy systems (SMESs) [10], etc. were successively tested in a live grid.…”

Section: Introductionmentioning

confidence: 99%

“…The transformer operated at 77 K, with capacity 500 kVA, voltage 6.6 kV/3.3 kV and current 76 A/152 A. Moreover, a capacity of 800 kVA was achieved when operating in 66 K temperature [4]. ABB of Switzerland and AMSC of America first developed a three-phase distribution HTS transformer with capacity 630 kVA, voltage 18.72 kV/ 0.42 kV and current 11.2 A/866 A, which had successfully operated in a live grid of Geneva for one year in 1997 [6].…”

Section: Introductionmentioning

confidence: 99%

Development and test in grid of 630 kVA three-phase high temperature superconducting transformer

Wang

Zhao

Han

et al. 2008

Front. Electr. Electron. Eng. China

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A 630-kVA 10.5 kV/0.4 kV three-phase high temperature superconducting (HTS) power transformer was successfully developed and tested in a live grid. The windings were wound by hermetic stainless steelreinforced multi-filamentary Bi2223/Ag tapes. The structures of primary windings are solenoid with insulation and cooling path among layers, and those of secondary windings consist of double-pancakes connected in parallel. Toroidal cryostat is made from electrical insulating glass fiber reinforced plastics (GFRP) materials with room temperature bore for commercial amorphous alloy core with five limbs. Windings are laid in the toroidal cryostat so that the amorphous core operates at room temperature. An insulation technology of double-half wrapping up the Bi2223/Ag tape with Kapton film is used by a winding machine developed by the authors. Fundamental characteristics of the transformer are obtained by standard short-circuit and no-load tests, and it is shown that the transformer meets operating requirements in a live grid.

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Development of a 500 kVA-class oxide-superconducting power transformer operated at liquid-nitrogen temperature

Cited by 77 publications

References 5 publications

Design, building and testing of a 10 kW superconducting induction heater

Design, building and testing of a 10 kW superconducting induction heater

Progress in inhomogeneity of critical current and index n value measurements on HTS tapes using contact-free method

Development and test in grid of 630 kVA three-phase high temperature superconducting transformer

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