Preliminary tests of a 500 kVA-class oxide superconducting transformer cooled by subcooled nitrogen

Funaki, K.; Iwakuma, Masataka; Takeo, M.; Yamafuji, Kaoru; Suchiro, J.; Hara, Masanori; Konno, M.; Kasagawa, Yusuke; Itoh, I.; Nose, S.; Ueyama, M.; Hayashi, Kazuhiko; Sato, K.

doi:10.1109/77.614630

Cited by 49 publications

(3 citation statements)

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“…After the transformations, the resistances of the superconductor layer can be represented by Equation ( 3 In order to formulate a computer model of one-phase transformer HTS 21 MVA 70/10.5 kV, a calculative project was elaborated for the geometric and electric parameters, based on the methodology depicted in [21][22][23][24][25][26][27][28][29]. These parameters are shown in Figure 5 and Table 3 [14,18].…”

Section: Pspice Model Of Hts Transformermentioning

confidence: 99%

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Influence of the HTS Winding Tape on Limiting the Transient Currents in Superconducting Transformers

Surdacki

Woźniak

2022

Energies

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The article presents an extended computer model of a HTS (high temperature superconducting) 21 MVA 70/10.5 kV transformer with severalfold compound windings, based on a verified PSpice model of 10 kVA transformer with single windings. Two superconducting tapes: SCS12050 (with a copper stabiliser layer) and SF12050 (without a stabiliser) were used in the windings. The circuit model of the transformer developed in the PSpice environment considers Rhyner’s power law and the Jiles–Atherton description of the magnetic hysteresis loop. Two types of transient states were analysed: switching on a superconducting transformer to the network and an emergency short-circuit of the secondary winding. For the first five unidirectional current pulses generated when connecting an unloaded transformer to the network, the values of the pulse duration (γ angle), the temperature increase in the primary winding as well as the mean and effective values of the switch-on current were calculated. The waveforms of currents, voltages, changes in resistance and temperature during the operation short-circuit were compared for the windings with both types of HTS 2G (high temperature superconductor second generation) tapes. The conducted analysis allowed us to determine the influence of electrical and thermal parameters of the tapes in question on the effective limitation of current in transient states and the possibility of their use in the construction of superconducting transformer windings.

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Section: Pspice Model Of Hts Transformermentioning

confidence: 99%

“…However, circuit modelling using PSpice provides satisfactory results and is faster compared to FEM analysis [17,18]. There are also some papers describing the models, design, and construction of HTS transformers of both small and considerable power [21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Influence of the HTS Winding Tape on Limiting the Transient Currents in Superconducting Transformers

Surdacki

Woźniak

2022

Energies

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“…The windings of most superconducting transformer prototypes have been built with Bi-2223 tapes [3][4][5][6]. Because the HTS material has an anisotropic molecular structure, the direction of the external magnetic field can affect the amount of AC losses.…”

Section: Introductionmentioning

confidence: 99%

A new approach for AC loss reduction in HTS transformer using auxiliary windings, case study: 25 kA HTS current injection transformer

Heydari

Faghihi

Aligholizadeh

2007

Supercond. Sci. Technol.

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AC loss is one of the important parameters in HTS (high temperature superconducting) AC devices. Among the HTS AC power devices, the transformer is an essential part in the electrical power system. The AC losses in an HTS tape depend on the magnetic field. One of the techniques usually adopted to mitigate the unwanted magnetic field is using a system of coils that produce a magnetic field opposite to the incident one, reducing the total magnetic field. In this paper adding two auxiliary windings to the HTS transformer to produce this opposite magnetic field is proposed. The proper use of these auxiliary windings could reduce the leakage flux and, therefore, the AC loss. A mathematical model is used to describe the behaviour of a transformer operating with auxiliary windings, based on the theory of electromagnetic coupled circuits. The influence of the auxiliary windings on the leakage field is studied by the finite element method (FEM) and the AC loss of an HTS transformer was calculated. Also, the simulation results show that employing auxiliary windings will improve the HTS transformer efficiency.

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Superconducting Transformers

Kalsi

1999

Wiley Encyclopedia of Electrical and Electronics Engineering

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Preliminary tests of a 500 kVA-class oxide superconducting transformer cooled by subcooled nitrogen

Cited by 49 publications

References 0 publications

Influence of the HTS Winding Tape on Limiting the Transient Currents in Superconducting Transformers

Influence of the HTS Winding Tape on Limiting the Transient Currents in Superconducting Transformers

A new approach for AC loss reduction in HTS transformer using auxiliary windings, case study: 25 kA HTS current injection transformer

Superconducting Transformers

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