Verification Testing for a 1 MVA 3-Phase Demonstration Transformer Using 2G-HTS Roebel Cable

Glasson, Neil; Staines, M.P.; Jiang, Zhenan; Allpress, Nathan

doi:10.1109/tasc.2012.2234919

Cited by 41 publications

(19 citation statements)

References 12 publications

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“…This article presents detailed modelling of fully superconducting transformers with more than one thousand turns or Roebel-cable strands in both the high-voltage (HV) and low-voltage (LV) windings. First, we model a 1 MVA 11 kV/415 V 3-phase transformer with a LV winding consisting of Roebel cable solenoid and a HV winding made of a stack of pancake coils (see figure 1 and tables 1 and 2) [23][24][25]. Special attention is given to the Roebel cable solenoid, which is also investigated as a stand-alone coil.…”

Section: Introductionmentioning

confidence: 99%

Ac loss modelling and measurement of superconducting transformers with coated-conductor Roebel-cable in low-voltage winding

Pardo

Staines

Jiang

et al. 2015

Supercond. Sci. Technol.

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Power transformers using high temperature superconductor (HTS) Re-BCO coated conductor and liquid nitrogen (LN) dielectric have many potential advantages over conventional transformers. The AC loss in the windings complicates the cryogenics and reduces the efficiency, and hence it needs to be predicted in its design, usually by numerical calculations. This article presents detailed modelling of superconducting transformers with Roebel cable in the low-voltage (LV) winding and a high-voltage (HV) winding with more than 1000 turns. First, we model a 1 MVA 11 kV/415 V 3-phase transformer. The Roebel cable solenoid forming the LV winding is also analyzed as stand-alone coil. Agreement between calculations and experiments of the 1 MVA transformer supports the model validity for a larger tentative 40 MVA 110 kV/11 kV 3-phase transformer design. We found that the AC loss in each winding is much lower when it is inserted in the transformer than as stand-alone coil. The AC loss in the 1 MVA and 40 MVA transformers is dominated by the LV and HV windings, respectively. Finally, the ratio of total loss over rated power of the 40 MVA transformer is reduced below 40 % of that of the 1 MVA transformer. In conclusion, the modelling tool in this work can reliably predict the AC loss in real power applications.

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Section: Introductionmentioning

confidence: 99%

Ac loss modelling and measurement of superconducting transformers with coated-conductor Roebel-cable in low-voltage winding

Pardo

Staines

Jiang

et al. 2015

Supercond. Sci. Technol.

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“…For the 1 MVA 3-phase transformer, in this article we focus on phase "1" [24]. The critical current of the Roebel cable for the LV winding at 77 K have been Figure 1: Top: 1 MVA 11 kV/415 V 3-phase transformer [23][24][25]; for clarity, the stage before installing iron cores, current leads and cryo-coolers is shown. Center: LV winding made of Roebel cable.…”

Section: Critical Current and Critical Current Densitymentioning

confidence: 99%

Ac loss modelling and measurement of superconducting transformers with coated-conductor Roebel-cable in low-voltage winding

Pardo¹,

Staines²,

Jiang³

et al. 2021

Preprint

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Power transformers using a high temperature superconductor (HTS) ReBCO coated conductor and liquid nitrogen dielectric have many potential advantages over conventional transformers. The ac loss in the windings complicates the cryogenics and reduces the efficiency, and hence it needs to be predicted in its design, usually by numerical calculations. This article presents detailed modelling of superconducting transformers with Roebel cable in the low-voltage (LV) winding and a high-voltage (HV) winding with more than 1000 turns. First, we model a 1 MVA 11 kV/415 V 3-phase transformer. The Roebel cable solenoid forming the LV winding is also analyzed as a stand-alone coil. Agreement between calculations and experiments of the 1 MVA transformer supports the model validity for a larger tentative 40 MVA 110 kV/11 kV 3-phase transformer design. We found that the ac loss in each winding is much lower when it is inserted in the transformer than as a stand-alone coil. The ac loss in the 1 and 40 MVA transformers is dominated by the LV and HV windings, respectively. Finally, the ratio of total loss over rated power of the 40 MVA transformer is reduced below 40% of that of the 1 MVA transformer. In conclusion, the modelling tool in this work can reliably predict the ac loss in real power applications. This is the Accepted Manuscript version of an article accepted for publication in 'Superconductor Science and Technology'. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/0953-2048/28/11/114008.

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“…In order to solve problem mentioned above, a solution proposed by Roebel is adapted [10]. It has been utilized in conventional windings for many decades.…”

Section: Hts Transformer Windingsmentioning

confidence: 99%

Superconducting Devices for Power Engineering

Janowski

Kondratowicz-Kucewicz

Wojtasiewicz

et al. 2016

Acta Phys. Pol. A

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The paper presents the current state of research on superconducting devices for the electrical power system, i.e. transformers, fault-current limiters, and energy storages. In particular, it describes scientific achievements of the Laboratory of Superconducting Technologies of Electrotechnical Institute. The development of distributed and renewable energy sources, as well as the increasing number of receivers with low power factor will rise interest in superconducting fault-current limiters and superconducting transformers rated below 1 MVA. Previous studies were focused on the largest power transformers and highest current superconducting fault-current limiters. ReBCO coated conductors allow to build efficient superconducting AC devices. Superconducting tape of a layered structure (second generation HTS tape) enables the construction of transformer rated up to a few MVA without the usage of parallel conductors. Relatively high resistance of the tape in normal state allows to build fault-current limiters and fault-current limiting transformers. Superconducting transformers and superconducting fault-current limiters can help to increase connected power of distribution stations and thereby accelerate development of renewable energy sources.

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Verification Testing for a 1 MVA 3-Phase Demonstration Transformer Using 2G-HTS Roebel Cable

Cited by 41 publications

References 12 publications

Ac loss modelling and measurement of superconducting transformers with coated-conductor Roebel-cable in low-voltage winding

Ac loss modelling and measurement of superconducting transformers with coated-conductor Roebel-cable in low-voltage winding

Ac loss modelling and measurement of superconducting transformers with coated-conductor Roebel-cable in low-voltage winding

Superconducting Devices for Power Engineering

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