Development of high-temperature superconducting transformers for railway applications

Schlosser, R.E.; Schmidt, H.; Leghissa, M.; Meinert, M.

doi:10.1109/tasc.2003.813118

Cited by 55 publications

(15 citation statements)

References 8 publications

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“…In Europe, a considerable step ahead marked the development of an HTS mobile transformer demonstrator for railway applications see, for example, Schlosser et. al 47 . whose aim was to develop and evaluate the future feasibility of HTS traction transformers for 16.7–50 Hz operation and that, however, used Bi‐2223 HTS tapes.…”

Section: Applications Of Ybacuo/rebacuo‐coated Conductorsmentioning

confidence: 99%

YBaCuO and REBaCuO HTS for Applications

Freyhardt

2007

Int J Applied Ceramic Tech

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The discovery of electrical conductors that carry loss‐less currents at liquid nitrogen temperatures and above, high‐temperature superconductors (HTS), inspired the imaginations of scientists and engineers in an unprecedented way. It culminated in a broad search for an understanding of their basic phenomena and properties, but also for new classes of the HTS. The availability of these materials created novel ideas of their use for effective and economical generation, transport, and use of electric energy. YBaCuO and related REBaCuO HTS compounds still belong to the most attractive workhorses. This contribution intends to illustrate the efforts to manufacture from these HTS bulk monoliths, wires, tapes, or conductors, which would be needed for novel components and devices for electrical and power engineering, devices that offer not only an effective use of energy but also broad environmental benefits and, furthermore, help to safe resources. The research and developments discussed are mainly focused on efforts in Europe.

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Section: Applications Of Ybacuo/rebacuo‐coated Conductorsmentioning

confidence: 99%

YBaCuO and REBaCuO HTS for Applications

Freyhardt

2007

Int J Applied Ceramic Tech

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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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“…Compared with a conventional locomotive transformer, HTS transformer weight and volume were reduced by 45% and 40% respectively. Efficiency improved from 92%-95% to 99%, while about 30% of energy consumed in the whole driving system can be saved [11,12]. In May 1998, American Electric Company collaborated with IGC and Oak Ridge National Laboratory completed a single-phase HTS transformer with capacity 1 MVA and voltage 13.8 kV/6.9 kV [5].…”

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 high-temperature superconducting transformers for railway applications

Cited by 55 publications

References 8 publications

YBaCuO and REBaCuO HTS for Applications

YBaCuO and REBaCuO HTS for Applications

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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