A non-inductive coil is an essential element of a resistive superconducting fault current limiter (FCL). A bifilar pancake type non-inductive coil, which is most common type, has two drawbacks; difficulty of paralleling tapes and a high risk of electrical breakdown at the terminal part. Although the bifilar type is simple as an element, large-scale FCL needs quite a number of series and parallel connections between elements. To make a non-inductive coil using conventional inductive elementary coils, we propose a novel structure of the coil. It looks like a toroid but entire inductance is near zero. This coil can overcome the drawbacks of conventional bifilar coil. In this paper, we confirm the new concept by numerical analyses. A few kinds of new models are compared, and then we concluded the proposed toroidal shape one is most suitable. This new structure coil can help implement of a hybrid FCL which is to generate the magnetic field at only fault.
Bibliographical noteFunding Information:
Manuscript received August 03, 2010; accepted November 11, 2010. Date of publication December 23, 2010; date of current version May 27, 2011. This work was supported by Mid-career Researcher Program through NRF Grant funded by the MEST (2009-0085369). M. C. Ahn is with the Department of Electrical Engineering, Kunsan National University, Gunsan, Jeonbuk, Korea. J. Y. Jang and T. K. Ko are with the School of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea. H. Lee is with the Department of Materials Science and Engineering, Korea University, Seoul, Korea (e-mail: firstname.lastname@example.org). 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.2010.2093590 Fig. 1. Non-inductive coil structures; (a) bifilar pancake, (b) series solenoid, and (c) parallel solenoid.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering