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

Content Provider	IEEE Xplore Digital Library
Author	Funaki, K. Iwakuma, M. Takeo, M. Yamafuji, K. Suchiro, J. Hara, M. Konno, M. Kasagawa, Y. Itoh, I. Nose, S. Ueyama, M. Hayashi, K. Sato, K.
Copyright Year	2002
Abstract	The authors have designed and fabricated a 500 kVA-class oxide superconducting power transformer operated in sub-cooled nitrogen. The primary and secondary windings are three- and six-strand parallel conductors of Bi-2223 Ag-sheathed multifilamentary tapes, respectively. In the parallel conductors, the strands are transposed several times for uniform current distribution among them. A transformer, cooled by liquid nitrogen of 77 K, was steadily operated with a 500 kVA secondary inductive load. The efficiency in full operation at 77 K was 99.1 %, even with the refrigeration penalty of liquid nitrogen, 20, for the thermal load to the coolant. They installed the transformer in a continuous flow system of sub-cooled nitrogen as a fundamental step for compact superconducting transformers operating in sub-cooled nitrogen with a single-stage refrigerator. Short-circuit tests of the transformer were also performed in a region of temperature below 70 K. The transformer was operated with no quenching up to a level of critical current at 66 K, that is equivalent to 800 kVA. The efficiency estimated was improved to 99.3 % in the sub-cooled nitrogen.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	824
Ending Page	827
Page Count	4
File Size	504965
File Format	PDF
ISSN	10518223
Volume Number	7
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Testing Power transformers Nitrogen Multifilamentary superconductors Superconducting films Conductors Refrigeration Current distribution Thermal loading Coolants
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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