Short-circuit current limitation by superconducting transformer

Limitation of thermal and dynamic effects of the passage of a short-circuit current can be obtained by limiting the short-circuit time and the value of the maximum initial short-circuit current - surge current. The paper presents the current state of research on superconducting transformers for the electrical power system, used for limiting the short-circuit current. The new 2G superconducting tapes with high resistivity in the normal state allow to build transformers with high short-circuit endurance. The short-circuit current limiting feature of the superconducting transformer, which is the most important benefit of replacing conventional windings by superconducting ones, provides protection and significantly reduces the wear and tear of circuit breakers and other substation power equipment. Properly designed and built superconducting transformer reduces first peak of short-circuit current - surge current, in time shorter that 5 ms, what secures the transformer from dynamic and thermal failure.