This paper presents a study on design technique of superconducting fault current limiters (SFCLs) with a bypass reactor. The SFCL system consists of a non-inductive superconducting coil and a copper coil as a bypass reactor. Since typical resistive SFCL impedance is too high to adopt the existing grid protection scheme, a bypass reactor is required to adjust the impedance. The superconducting coil is a current-driven passive element; hence, connecting a bypass reactor in parallel affects the current sharing between the superconducting coil and the copper reactor. We proposed a design technique to estimate the generated impedance considering the current sharing. The technique is based on a SPICE simulation and thermal finite element analysis (FEA). By comparing to the test result with two kinds of bypass reactors, it is confirmed that the proposed method can simulate all currents and voltages properly. As a result, a case study was conducted on the design of the SFCL system, rated on 13.2 kV/2.5 kA was being considered as a new distribution grid in Korean metropolitan areas.
Bibliographical noteFunding Information:
Manuscript received September 13, 2011; accepted December 28, 2011. Date of publication February 23, 2012; date of current version May 24, 2012. This work was supported by the Mid-career Researcher Program under an NRF grant 2009-0085369 funded by the MEST. M. C. Ahn is with the Department of Electrical Engineering, Kunsan National University, Jeonbuk 573-701, Korea. K. S. Chang is with Hyundai Heavy Industries, Yongin 446-716, Korea. T. K. Ko is with the School of Electric and Electronic Engineering, Yonsei University, Seoul 120-749, Korea. J.-B. Song and H. Lee are with the Department of Materials Science and Engineering, Korea University, Seoul 136-713, Korea (e-mail: firstname.lastname@example.org. kr). Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2012.2182977
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering