Development and test of a 100 kVA superconducting transformer operated at 77 K

High-temperature superconducting (HTS) transformers are very promising cand idates for application in electrical power engineering. Their main advantag es are reduced size, weight, better efficiency and reduced potential fire a nd environmental hazards. We have designed, constructed and tested a 100 kV A HTS power transformer operated at 77 K. The nominal primary and secondary currents (voltages) are 18 A (5.6 kV) and 92 A (1.1 kV), respectively. No- load tears, short-circuit tests and load tests proved repeatedly that the t ransformer has the rated capacity. NTS winding losses of 20.6 W and iron lo sses of 403 W were measured.