In general case of DC reactor type superconducting fault current limiter (SFCL), a fault current gradually increases during the fault. It takes above 5 cycles to cut off the fault in the existing power system installed the conventional circuit breakers (CBs). Therefore, the fault current increases during the fault even if the SFCL is installed. This paper proposes a technique for decaying the fault current with the function of the fault detection and control of power converter of the SFCL. Using the proposed method, the fault current can decay after 1-2 cycles when the fault occurs. To analyze this technique, three-phase 6.6 kV/200 A SFCL was fabricated. The SFCL has just one DC reactor, an AC to DC power converter which has thyristors as the rectifying device, and a three-phase transformer, which is called magnetic core reactor (MCR). The short-circuit tests of this SFCL were performed successfully. Comparing the result using the proposed technique with the typical result, the fault current is decreased effectively by the proposed technique. This result shows that this SFCL using the fault detection and control of power converter can be applied to the existing power system which has conventional CBs.
Bibliographical noteFunding Information:
Manuscript received October 5, 2004. This research was supported by a grant from the Center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program funded by the Ministry of Science and Technology, Republic of Korea. M. C. Ahn, H. Kang, D. K. Bae, D. K. Park, and T. K. Ko are with the Department of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea (e-mail: email@example.com). Y. S. Yoon is with the Department of Electrical Engineering, Ansan College of Technology, Ansan, Korea (e-mail: firstname.lastname@example.org). S. J. Lee is with the Department of Electrical Engineering, Uiduk University, Kyungju, Korea (e-mail: email@example.com). Digital Object Identifier 10.1109/TASC.2005.849462
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering