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    Switching and Decoupling Effects in a Single-Phase Transformer Using Extra DC Current
    (IEEE-Inst Electrical Electronics Engineers Inc, 2016) Gecer, S.; Ertekin, E.; Yanmaz, E.; Kosa, J.; Safran, S.; Ozguzel, R.; Kilicarslan, E. S.
    A single-phase current-limiting transformer has been developed based on flux transfer. The transformer consists of two independent iron cores, one primary coil, two separate secondary coils, and superconducting windings/loops. Two iron cores are in a mechanical contact and clamped. Superconducting windings/loops act as coupling/decoupling mechanism between two iron cores. The transformer has been made operational via a switchgear of the applied dc current for a potential use in the current limitation when the transition between the superconducting and normal (quench) states can be triggered. DC and ac currents can be applied simultaneously in fault and no-fault conditions to mimic the realistic cases of use. With decoupling ac energy transfer, we propose that conventional switching off may be replaced with the approach described.
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    Test of 6-kVA Three-Phase Flux Transfer-Type Current-Limiting Transformer
    (Springer, 2017) Ertekin, E.; Gecer, S.; Yanmaz, E.; Safran, S.; Kosa, J.; Kilicarslan, E. S.; Kilic, A.
    A 6-kVA three-phase model of the flux transfer-type current-limiting transformer was developed and tested. In this device, the winding loops of YBCO superconducting tapes couple magnetically two independent iron cores: the primary-side iron core and the secondary-side iron core. The former and the latter are equipped with copper primary and secondary windings, respectively. Because the magnetic fluxes linked to the superconducting winding loops must be kept constant, the magnetic flux is transferred by the superconducting YBCO loops between the two iron cores in order to couple magnetically the primary and secondary coils. While the YBCO loops are superconducting, 100 % of the magnetic flux is transferred and the device shows the similar function as usual transformers. Once the YBCO loops become normal by a fault current in any of the windings, the power transfer between two iron cores is limited and the current in the secondary winding is limited naturally on a result of decoupling the iron cores.