15% reduction in AC loss of a 3-phase 1 MVA HTS transformer by exploiting asymmetric conductor critical current

Zhenan Jiang, Wenjuan Song, Xiaoze Pei, Jin Fang, Rodney A Badcock, Stuart C Wimbush

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An asymmetric dependence of the critical current on the direction of an applied magnetic field in HTS coated conductors has a non-trivial influence on the AC loss of coil windings. We report the modelled influence of real conductor critical current asymmetry on the AC loss characteristics of a 1 MVA HTS transformer design previously demonstrated by the Robinson Research Institute as well as a stand-alone coil having the same geometrical and electrical parameters as the low voltage (high current) winding of the transformer. We compare two commercial HTS conductors with distinctive differences in their critical current asymmetry and show a maximum variation of 15% and 29% in the calculated AC loss of the transformer and the stand-alone coil winding, respectively, when the conductor orientation is varied in the top and bottom halves of the windings. AC loss simulation giving consideration to asymmetric conductor critical current before winding the transformer could lead to substantial AC loss reduction even using the same amount of conductor and the same transformer design.
Original languageEnglish
Article number025003
Pages (from-to)1-12
Number of pages12
JournalJournal of Physics Communications
Issue number2
Publication statusPublished - 4 Feb 2021

Bibliographical note

Funding Information:
This work was partially supported by the Chinese Ministry of Science and Technology through the National Key Research and Development Program of China under Grant No. 2016YFE0201200. This work was also partially supported by the New Zealand Ministry of Business, Innovation and Employment Contract No. RTVU1707.

Publisher Copyright:
© 2021 The Author(s).


  • Acloss
  • Asymmetric critical current
  • Hts transformer
  • Rebco coated conductors

ASJC Scopus subject areas

  • General Physics and Astronomy


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