An improved model of the current limiting devices such as the high-Tc superconducting fault current limiter (SFCL) and the reactor have been developed. The high-Tc SFCL mainly consists of the primary copper coil, the secondary high-Tc superconducting rings, and the damping coils, which are magnetically coupled through three-legged magnetic core. Because a portion of the magnetic flux above the saturation point generated by the fault current is cancelled by the damping coil, thereby the magnetic core is prevented from getting into the saturated state. The limiting current level and the saturation of the core could be controlled by the air-gap length of the central leg with the damping coil. A new design of the SFCL is found to increase the effective impedance by about 60 to 70%, compared to the SFCL design without the damping coils.
Bibliographical noteFunding Information:
The authors are would like to thank I. S. Song, S. S. Rhee, and Y. J. Yu of the First Law Offices of Korea for their support in obtaining a U.S. patent in connection with this work. The authors wish to express special thanks to C. J. Lee, J. B. Hong, and W. G. Chang for their collaboration. They also wish to thank the Ministry of Science and Technology (MOST), Korea, for the opportunity to pursue these studies.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering