In this study, an inductance measurement method by electrical method are originally suggested for a 22.9 kV/50 MVA high temperature superconducting (HTS) cable with a conductor and a shield. Using this method, we experimentally evaluate selfinductances of the conductor and shield, respectively, and also their mutual inductance. To verify the measured data, the self and mutual inductances of the conductor and shield are calculated from finite element method. The main result shows the calculated inductances are in good agreement with measured ones. Therefore, the reliability of the inductance measurement method is confirmed.
This paper presents the characteristic tests and electromagnetic analysis of a single-phase high temperature superconducting (HTS) air core transformer prototype. Single pancake (SP) windings with GdBCO coated conductors were used in this transformer. The primary windings were six SPs connected in series and the secondary windings were three SPs connected in parallel. Fundamental, loss and critical current characteristics were obtained by no-load and load tests. A fieldcircuit coupled model built in COMSOL was used to analyze the electromagnetic characteristic of this transformer. The experiment results were in consistent with the simulation values. The numerical model was validated, and could be applied in engineering. Finally, the circulating currents with and without an iron core were calculated. The transformer with an iron core has a smaller circulating current than that of without an iron core.
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