Influence of HTS tape parameters on limiting the inrush current in superconducting transformers

The paper presents a computer model of superconducting tapes, SCS12050 with a copper stabiliser layer and SF12050 without a stabiliser, taking into account their electrical and thermal parameters. The obtained waveforms of cooling and heating power, temperature and currents flowing in individual layers of both types of tape were compared. A computer model of this device developed in the PSpice environment was used to calculate the inrush current of a 21 MVA, 70/10.5 kV HTS superconducting HTS transformer. The first three unidirectional current pulses generated during connecting an unloaded transformer to the network were analysed. The values of the pulse duration (& gamma; angle), the temperature increase of the primary winding as well as the mean and effective values of the inrush current for the first three pulses in the windings with both types of HTS 2G tape were calculated. The conducted analysis allowed to determine the influence of the parameters of the tapes under consideration on the effective limitation of the transformer inrush current to the supply network and the possibility of their use in the construction of superconducting transformer windings.