Influence of Flux Diverter on Magnetic Field Distribution for HTS Transformer Windings

High-temperature superconducting (HTS) transformers employ highly efficient HTS windings to replace the conventional windings. However, the magnetic field in an HTS transformer affects the transformer's HTS winding performances. The relationship between HTS tape characteristics and the magnetic field has been studied. The HTS windings critical current can be increased with the perpendicular magnetic field decreasing. A concept of unbalanced degree is introduced in this paper. The unbalanced degree of critical current distributions at the ends of windings decreases with the perpendicular magnetic field and the unbalanced degree of perpendicular magnetic field distributions decreasing. For the effects of flux diverter, the unbalanced degrees of perpendicular magnetic field and critical current distributions are analyzed and optimized.