CHARACTERISTICS OF A 40KVA 3-PHASE SUPERCONDUCTING TRANSFORMER AND ITS PARALLEL OPERATION WITH A CONVENTIONAL TRANSFORMER

A 40 k VA three phase superconducting transformer has been developed and tested. From the test results, excellent voltage regulation of 0.3% with a pure resistive load was obtained. As a usage in a power system, parallel operation with a conventional transformer using copper windings has been carried out, Although a superconducting transformer cannot continue to operate in case of quenching, the proposed parallel system can overcome came the drawback and give us an additional value of fault current limiting function.