지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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With increasing demand of power, the equipment of power system is enlarging and the absolute capacity is going up. As a result, when a fault occurs, the fault current is consistently increasing. Therefore, I suggested some solution for limiting the fault current more efficiently. This study shows the characteristics of superconducting limiting elements and normal conducting elements combined with a transformer. We performed a short-circuit test about the fault current by using SCR switching control system operated from a CT. When short circuit accidents happened in the secondary side of a transformer, fault currents flowed and a SCR switching control system was operated. It resulted in a decrease of the fault current in the limited elements of third winding connected in parallel. For this test, we used YBCO thin films and normal conducting elements as the limited elements. Within a cycle, a superconducting fault current limiter with YBCO thin films reduced more than 90% of fault current because the resistance of superconducting elements sustainedly grew. On the other hand, the limiter with normal conductors limited as much as a set value because its resistance characteristic was linear. Consequently, in case of the limiter with superconductor, limiting range of the circuit was wide but the range of protective detection was undefined. In contrast, as for the limiter with normal conductors, limiting range and protection duty were appropriate.
목차
Abstract
1. Introduction
2. Maintain
3. Conclusion
Reference
참고문헌 (6)
참고문헌 신청
1. [학술지(정기간행물)] - H. S. Choi / 2002 / Switching properties of hybrid type superconducting fault current limiter using YBCO stripes / IEEE Trans. Appl. Supercond 12 : 1833 ~ 1838
2. [학술지(정기간행물)] - H. S. Choi / 2007 / Operating Performance of the Flux-Lock and the Transformer Type Superconducting Fault Current Limiter Using the YBCO Thin Films / IEEE Trans. Appl, Superconduc 17 : 1823 ~ 1826
3. [학술지(정기간행물)] - K. H. Ha / 2012 / Operational Behaviors of Flux-Coupling Type SFCL Using Integrated Three Phase Transformer Under Transient State / IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 22 (3) : 5601604 ~ 5601604
4. [학술지(정기간행물)] - J. S. Kim / 2010 / Study on Protective coordination of a Flux-Lock Type SFCL with Over-Current Relay / IEEE Trans. Appl. Supercond 20 (3) : 1159 ~ 1163
5. [학술지(정기간행물)] - O. B. Hyun / 2009 / Reliability Enhancement of the Fast Switch in a Hybrid Superconducting Fault Current Limiter by Using Power Electronic Switches / IEEE Trans. Appl. Supercond. 19 (3) : 1843 ~ 1846
2. [학술지(정기간행물)] - H. S. Choi / 2007 / Operating Performance of the Flux-Lock and the Transformer Type Superconducting Fault Current Limiter Using the YBCO Thin Films / IEEE Trans. Appl, Superconduc 17 : 1823 ~ 1826
3. [학술지(정기간행물)] - K. H. Ha / 2012 / Operational Behaviors of Flux-Coupling Type SFCL Using Integrated Three Phase Transformer Under Transient State / IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 22 (3) : 5601604 ~ 5601604
4. [학술지(정기간행물)] - J. S. Kim / 2010 / Study on Protective coordination of a Flux-Lock Type SFCL with Over-Current Relay / IEEE Trans. Appl. Supercond 20 (3) : 1159 ~ 1163
5. [학술지(정기간행물)] - O. B. Hyun / 2009 / Reliability Enhancement of the Fast Switch in a Hybrid Superconducting Fault Current Limiter by Using Power Electronic Switches / IEEE Trans. Appl. Supercond. 19 (3) : 1843 ~ 1846
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UCI(KEPA) : I410-ECN-0101-2014-500-002463667