Research on resistive superconducting fault current limiters (SFCLs) using coated conductor(CC) has now been advanced from development to commercialization stage. It is necessary to investigate the recovery characteristics of SFCL for effective application to power system. In Korea, if the SFCL is directly inserted to distribution power grid, it must be recovered in 0.5 s after fault. Since temperature sensor is not accurate in liquid nitrogen bathe and temperature of CC, after falling down below 92 K, is impossible to be measured by electrical method, it is difficult to measure the temperature of SFCL during the recovery of YBCO CC. In this paper, an experimental method was proposed to determine the recovery of resistive SFCLs. Under over-current for 0.1 s, maximum temperature of high temperature superconductor (HTS) wire increased to 300 K; after a few seconds, recovery time was measured by increasing DC current. With these experiments, thermal relaxation time required for the temperature of CC to decrease to 77 K was analyzed.
Bibliographical noteFunding Information:
Manuscript received August 29, 2007. This work 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. S.-E. Yang, D.-K. Park, K.-S. Chang, J.-W. Park and T.-K. Ko are with the Electrical and Electronic Engineering Department, Yonsei University, Seoul 120-749, Korea (e-mail: email@example.com). M.-C. Ahn is with FBML/MIT, Cambridge, MA 02139 USA (e-mail: firstname.lastname@example.org). B.-Y. Seok is with the Electro-Mechanical Research Institute, Hyundai Heavy Industries Co., Ltd., Yongin, Korea (e-mail: email@example.com). H.-M. Chang is with the Cryogenic Engineering Laboratory, Hongik 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.2008.920803
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering