The short-circuit test results of 6.9 kV/2.3 kV 400 kVA-class YBCO model transformer with fault current limiting function

A. Tomioka, T. Bohno, S. Kakami, M. Isozaki, K. Watanabe, K. Toyama, S. Sugiyama, M. Konno, Y. Gosho, H. Okamoto, H. Hayashi, T. Tsutsumi, Masataka Iwakuma, T. Saito, K. Tanabe, Y. Shiohara

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Abstract

We are developing an elemental technology for 66/6.9 kV 20 MVA-class superconducting power transformer with fault current limiting function. In order to obtain the characteristics of YBCO conductor when the AC over current supplied to the conductor, the model coils were manufactured with YBCO tapes and tested. Based on these results, we manufactured the 6.9 kV/2.3 kV 400 kVA-class YBCO model transformer with fault current limiting function and performed short-circuit test. At the 0.25 s after short-circuit, the short-circuit current of primary winding was limited to about 174 A for a prospective current of 559 A. It was consistent with the design. The I-V characteristics of the winding did not change before and after the test. We consider the model transformer to be able to withstand AC over-current with the function of current limiting. The results suggest the possibility to design YBCO superconducting transformers with fault current limiting function for practical power grid.

Original languageEnglish
Pages (from-to)239-241
Number of pages3
JournalPhysica C: Superconductivity and its applications
Volume484
DOIs
Publication statusPublished - Jan 15 2013

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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