Performance of a 1-MVA HTS demonstration transformer

Schwenerly, S.W.; McConnell, B. W.; Demko, J. A.; Fadnek, A.; Hsu, Jong-Sen; List, F.A.; Walker, M. S.; Hazelton, D.W.; Murray, F.S.; Rice, J.A.; Trautwein, Christian; Shi, X.; Farrell, Richard A.; Bascuhan, J.; Hintz, R.E.; Mehta, S.P.; Aversa, N.; Ebert, J.A.; Bednar, Bedrich; Neder, D.J.; McIlheran, A.A.; Michel, Philippe; Nemce, J.J.; Pleva, E.F.; Swenton, A.C.; Swets, W.; Longsworth, R. C.; Johsnon, R.C.; Jones, R. H.; Nelson, J. K.; Degeneff, R.C.; Salon, S.J.

doi:10.1109/77.783387

Cited by 64 publications

(15 citation statements)

References 2 publications

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“…Once a better insulation material is found for transformers, a compact transformer can be installed on trailers for mobile applications in cases of emergency power recovery (Schwenterly et al 2002;Schwenterly et al 1999;Weber et al 2005). In addition a compact transformer would be preferable in substation locations with high real estate values.…”

Section: The Commercial Impact Of Enhanced Electrical Strength and Enmentioning

confidence: 99%

Industrial Applications Perspective of Nanodielectrics

Tuncer¹,

Sauers²

2009

Dielectric Polymer Nanocomposites

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The field of nanodielectrics has had a significant impact on voltage endurance characteristics of electrical insulation. Improved time-tobreakdown behavior, resulting in reduced aging of insulation, and enhanced thermal stability are of considerable importance in industrial applications. This chapter discusses several specific aspects of nanodielectrics and their role in the future of electrical insulation and dielectric sciences. IntroductionOne should not forget that power technology-high-voltage apparatus, transmission, and most electrical components-could not exist without satisfactory electrical insulation. It is a challenging task to design and optimize an electrical insulation system while energy demand, voltage levels, and operating temperatures are either increasing in conventional applications or decreasing to cryogenic temperatures in superconducting applications. In addition, these * Research sponsored by the U.S. Department of Energy-Office of Electricity Delivery and Energy Reliability, Superconductivity Program for Electric Power Systems under contract DEAC05-00OR22725 with Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC.2 electrical components and equipment sizes are becoming smaller and more compact than conventional devices, placing greater demands on the insulation. New insulation materials are expected to have better endurance and to have better reliability than their conventional counterparts. Recent developments in composite materials filled with nanometer-size particles (defined here as particles in which at least one dimension is in the range 1-100 nm) have shown some interesting results, creating a new research field in electrical insulation being referred to as nanodielectrics (Lewis 1994;Lewis 2006;Nelson and Fothergill 2004;Cao et al. 2004).A detailed description of dielectrics for high-voltage applications was provided in earlier work by Dakin (1978). In this chapter, our discussion will focus on recent developments in the field of nanodielectrics. Only solid insulation materials composed of nanoparticle-loaded polymers will be considered here. The chapter is organized as follows. Different aspects of the nanodielectrics will be considered starting with the background and challenges faced in synthesizing nanocomposites. Some of the significant advantages of the nanodielectrics and their impact on electrical insulation industry are then discussed in the context of dielectric breakdown and voltage endurance. Nanodielectric applications at high and low temperatures together with specific device/component applications are discussed as well.

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Section: The Commercial Impact Of Enhanced Electrical Strength and Enmentioning

confidence: 99%

Industrial Applications Perspective of Nanodielectrics

Tuncer¹,

Sauers²

2009

Dielectric Polymer Nanocomposites

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“…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]. Furthermore, Oxford Instrument Company (England) and Electrical Engineering Laboratory of Grenoble (France) together designed a single-phase HTS transformer with capacity 41 kVA and voltage 2.1 kV/0.4 kV that was supported by the European Ready Project.…”

Section: Introductionmentioning

confidence: 97%

“…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%

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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“…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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Performance of a 1-MVA HTS demonstration transformer

Cited by 64 publications

References 2 publications

Industrial Applications Perspective of Nanodielectrics

Industrial Applications Perspective of Nanodielectrics

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

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

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