Fabrication and test of superconducting air-core autotransformer

Author

Okada, N. ; Kamijo, H. ; Ishigohka, T. ; Yamamoto, M.

Author_Institution

Siekei Univ., Tokyo, Japan

Volume

28

Issue

1

fYear

1992

fDate

1/1/1992 12:00:00 AM

Firstpage

430

Lastpage

433

Abstract

An experimental superconducting air-core autotransformer (SCACAT) with a rating of 2.5 kVA was fabricated. The configuration of the autotransformer is adopted because it is appropriate for air-core transformers to mitigate the increase of the impedance. The rated voltage and current are 300/150 V and 14/17 A, respectively. The current ratio does not coincide with the inverse of the voltage ratio because of the presence of the large exciting current. No-load, short circuit, and load tests were carried out. The experimental results indicate that, as expected, the exciting current becomes very large. It occupies about 45% of the rated current. In addition, the leakage impedance increases considerably; it becomes about 0.28 pu

Keywords

autotransformers; short-circuit currents; superconducting devices; transformer testing; 2.5 kVA; current ratio; exciting current; leakage impedance; load tests; no load test; rated current; rated voltage; short circuit test; superconducting air-core autotransformer; voltage ratio; Circuit testing; Fabrication; Impedance; Iron; Magnetic cores; Power systems; Shunt (electrical); Superconducting cables; Superconducting filaments and wires; Transformer cores;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.119903

Filename

119903