Abstract
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.
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