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Fabrication and fundamental characteristics of a superconducting air‐core autotransformer
Author(s) -
Ishigohka Takeshi,
Okada Naotaka,
Kamijo Hiroki,
Yamamoto Mitsuyoshi
Publication year - 1992
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391120406
Subject(s) - autotransformer , fabrication , core (optical fiber) , superconductivity , electrical engineering , materials science , engineering physics , mechanical engineering , engineering , physics , transformer , condensed matter physics , voltage , composite material , medicine , alternative medicine , distribution transformer , pathology
With the recent advent of high‐performance ac superconductors with very small ac loss and large current‐carrying capacity, the possibility of an air‐core superconducting transformer is being studied. Although the exciting current is very large, the air‐core transformer has the following merits: (1) no iron loss; (2) no insulation care of the core; (3) no harmonics, and no in rush current induced by iron saturation, etc. Thus, the authors fabricated and tested a small experimental transformer (2.5 kVA, 330/150 V). As easily predicted, the exciting current becomes very large. It occupies about 45 percent of the rated current. Meanwhile, the leakage reactance increase considerably. The %IX becomes about 28 percent. These experimental results show good agreement with the theoretical analysis based on an equivalent circuit.