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Ko, Seok-Cheol,Han, Tae-Hee,Lim, Sung-Hun The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.6
In this study, a superconducting fault current limiter (SFCL) having two magnetic paths was proposed, and its current limiting characteristics were analyzed. For the SFCL to effectively perform the current limiting operation, it must be designed considering the magnetic saturation of the E-I core. Further, the influence of the magnetic flux on its peak current limiting characteristics was investigated. In addition, the magnetic flux curves of the SFCL obtained from the fault current limiting experiments were analyzed, and the subtractive polarity winding case was observed to not only further reduce the saturation potential of the core but also perform the peak current limiting functions well when compared with the additive polarity winding case.
Ko, Seok-Cheol,Kim, Young-Pil,Lim, Sung-Hun The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.1
In this work, the current limiting and recovery characteristics of a flux-lock type superconducting fault current limiter (SFCL) with series connection of two coils were effectively improved by adding a third winding into the conventional flux-lock type SFCL with series connection of two coils. To confirm the contribution of the third winding to the current limiting and recovery characteristics of this type of the SFCL, short-circuit testing was carried out with consideration of the third winding, and the effect of the third winding on the current limiting and recovery characteristics was examined by comparative analysis of the amplitude of the limited fault current and the power burden of the high-TC superconducting (HTSC) element comprising the SFCL. Through the analysis of both the limiting impedance and the operational current as the main design parameter of the SFCL, the improved current limiting and recovery characteristics of the flux-lock type SFCL using the third winding could be verified.
Seok-Cheol Ko,Tae-Hee Han,Sung-Hun Lim 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.6
In this study, a superconducting fault current limiter (SFCL) having two magnetic paths was proposed, and its current limiting characteristics were analyzed. For the SFCL to effectively perform the current limiting operation, it must be designed considering the magnetic saturation of the E-I core. Further, the influence of the magnetic flux on its peak current limiting characteristics was investigated. In addition, the magnetic flux curves of the SFCL obtained from the fault current limiting experiments were analyzed, and the subtractive polarity winding case was observed to not only further reduce the saturation potential of the core but also perform the peak current limiting functions well when compared with the additive polarity winding case.
Seok-Cheol Ko,Sung-Hun Lim IEEE 2016 IEEE transactions on applied superconductivity Vol.26 No.4
<P>The advantage of the flux-lock-type superconducting fault current limiter (SFCL) is that the operational current of the SFCL can be easily adjusted by the winding ratio and the winding direction between two windings. Furthermore, the peak fault current limiting operation according to the transient initial fault current was reported to be performed by adding the third winding and another superconducting element into the flux-lock-type SFCL with either one or two magnetic paths. In this paper, the magnetizing characteristics of the modified flux-lock-type SFCL, due to its peak fault current limiting operation, which another superconducting element and the third winding were added into the E-I iron core structure with two magnetic paths, were analyzed. To analyze the dependence of its magnetizing characteristics on the peak fault current limiting operation of the SFCL, the peak fault current limiting tests of the SFCL due to the fault angle were carried out. With the measured voltage and the current values, the flux linkage and the magnetization current derived from the equivalent magnetization circuit were calculated and compared, at each fault angle, together with the magnetizing power related with the accumulated magnetic energy in the iron core during the fault period.</P>
Seok-Cheol Ko,Young-Pil Kim,Sung-Hun Lim 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.1
In this work, the current limiting and recovery characteristics of a flux-lock type superconducting fault current limiter (SFCL) with series connection of two coils were effectively improved by adding a third winding into the conventional flux-lock type SFCL with series connection of two coils. To confirm the contribution of the third winding to the current limiting and recovery characteristics of this type of the SFCL, short-circuit testing was carried out with consideration of the third winding, and the effect of the third winding on the current limiting and recovery characteristics was examined by comparative analysis of the amplitude of the limited fault current and the power burden of the high-TC superconducting (HTSC) element comprising the SFCL. Through the analysis of both the limiting impedance and the operational current as the main design parameter of the SFCL, the improved current limiting and recovery characteristics of the flux-lock type SFCL using the third winding could be verified.