Short-circuit Impedance Analysis of High Temperature Superconducting Transformers considering Flux Diverters and Superconducting Characteristics

Short-circuit impedance is an essential parameter in designing process of high temperature superconducting (HTS) transformers. This paper analyses short-circuit impedance of HTS transformers with flux diverters (FDs) based on magnetic field energy method. In this paper, superconductor windings of a transformer are modeled and FDs are applied to both ends of windings for short-circuit impedance and AC loss analysis. The results of this work prove that FDs play an important role on improving short-circuit impedance of HST to some extent as well as reducing AC loss.