Magnetizing Characteristics of Transformer Type SFCL With Additional Secondary Winding Due to Its Winding Direction

In this paper, the magnetizing characteristics of the transformer type superconducting fault current limiter (SFCL) with the additional secondary winding due to its winding direction were analyzed together with its peak fault current limiting operation. To analyze the dependence of its magnetizing characteristics on the winding direction of the additional secondary winding, the peak fault current limiting tests of the SFCL were carried out for two winding directions, which were expressed as additive polarity winding and subtractive polarity winding. The flux linkage and the magnetization current, which were related with the saturation of the iron core comprising the transformer type SFCL, were calculated from the measured voltage and the current values. The magnetizing powers during the fault period in case of the additive polarity winding were observed to be more increased compared with the subtractive polarity winding.