Volt-ampere rating of air-core superconducting power transformers

Kataoka, T.; Yamaguchi, Hiroshi; Sato, Yukihiko; Hayashi, Satoshi; Morimoto, H.

doi:10.1109/20.281240

Cited by 15 publications

(3 citation statements)

References 2 publications

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“…The conversion factor , which is used to convert the secondary side value to the primary side, is defined by . This conversion factor is very useful for analysing the influence of the magnetic coupling factor and the magnetizing current on the transformer characteristics, and the validity 1051-8223/04$20.00 © 2004 IEEE of the equivalent circuit has been confirmed by the previous investigations [5], [6]. Note that this equivalent circuit can also be used for other fault current limiters such as the magnetic shield type [4].…”

Section: Theoretical Characteristicsmentioning

confidence: 93%

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Characteristics Analysis of Transformer Type Superconducting Fault Current Limiter

Yamaguchi

Kataoka

Yaguchi

et al. 2004

IEEE Trans. Appl. Supercond.

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The transformer type superconducting fault current limiter, which is made up of a series transformer and a superconducting current limiting device, has many advantages such as the design flexibility of the current limiting device. However, the design strategy for determining the superconducting current limiting device ratings and the transformer ratings is unclear because the relations between the current limiting characteristics and these ratings are not analyzed enough.In this paper, the relations between the current limiting characteristics and these ratings are analyzed theoretically. The experimental results of the transformer type superconducting fault current limiter are also shown.

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Section: Theoretical Characteristicsmentioning

confidence: 93%

“…The ratings of the transformer are determined by the same method as that used for the air-core transformer [5]. This method is obtained by expanding the rating definition in order to evaluate the effect of the magnetic coupling factor and the magnetizing current precisely.…”

Section: Experimental Current Limitermentioning

confidence: 99%

Characteristics Analysis of Transformer Type Superconducting Fault Current Limiter

Yamaguchi

Kataoka

Yaguchi

et al. 2004

IEEE Trans. Appl. Supercond.

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“…It is important to establish the equivalent circuit of a specific power device. In Kataoka et al (1993), Yamaguchi et al (1992), Yamaguchi et al proposed an equivalent circuit for HTS-ACT and studied its loss characteristics. In fact, even though possible in principle, HTS-ACT is not technically and economically feasible because of the large number of conductors (and related alternate current [AC] losses) that would be needed to keep the magnetization current within an acceptable value (Morandi et al , 2008).…”

Section: Introductionmentioning

confidence: 99%

Modeling and verification of the equivalent circuit for high temperature superconducting partial-core transformer with ReBCO-coated conductors

Zhang

et al. 2018

COMPEL

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Purpose The purpose of this study is to propose a modeling method of the equivalent circuit for a new type of high-temperature superconducting partial-core transformer (HTS-PCT) made of ReBCO-coated conductors. Design/methodology/approach The modeling process is based on the “Steinmetz” equivalent circuit. The impedance components in the circuit are obtained by the calculations of the core losses and AC losses of the HTS windings by using theoretical methods. An iterative computation is also used to decide the equivalent resistances of the AC losses of the primary and secondary HTS windings. The reactance components in the circuit are calculated from the energy stored in the magnetic fields by finite element method. The validation of the modeling method is verified by experimental results Findings The modeling method of the equivalent circuit of HTS-PCT is valid, and an equivalent circuit for HTS-PCT is presented. Practical implications The equivalent circuit of HTS-PCT could be obtained by the suggested modeling method. Then, it is easy to analyze the characteristics of the HTS-PCT by its equivalent circuit. Moreover, the modeling method could also be useful for the design of a specific HTS-PCT. Originality/value The study proposes a modeling method of the HTS-PCT made of the second-generation HTS tapes, i.e. ReBCO-coated conductors.

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Magnetic field analysis of air-core superconducting transformer

et al. 1995

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In the applications of the superconducting wires to the a c power fleld, the magnetic fleld analysis is very important in order t o investigate their power loss and stability. In this paper, a calculation method of magnetic fleld in the air-core transformer, which is one type of the superconducting transformer, is introduced. Then, based on this method, the magnetic field acting on the transformer winding is analyzed. Results of analysis And that the magnetic fleld of the air-core superconducting transformer does not distribute uniformly and that the magnetic flefd under load has a rotating component.

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Volt-ampere rating of air-core superconducting power transformers

Cited by 15 publications

References 2 publications

Characteristics Analysis of Transformer Type Superconducting Fault Current Limiter

Characteristics Analysis of Transformer Type Superconducting Fault Current Limiter

Modeling and verification of the equivalent circuit for high temperature superconducting partial-core transformer with ReBCO-coated conductors

Magnetic field analysis of air-core superconducting transformer

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