FEM and laboratory tests of HTS transformer with improved utilization of superconducting wire

The paper describes results of FEM analysis and laboratory tests of HTS transformer with modified shape of windings. The shape of transformer windings, called as helical one, improves HTS wire utilisation due to magnetic flux decreasing. The transformer has 1:1 turn-to-turn ratio and amorphous magnetic core immersed in LN2. It operates at 50 Hz. Components of magnetic flux density, determined by 3D FEM analysis, are investigated in the paper. Also some aspects of laboratory tests are described.