Recovery Behaviors of the Transformer-Type SFCL With or Without Neutral Lines

• Published in: IEEE transactions on applied superconductivity Vol. 19; no. 3; pp. 1793 - 1796
• Main Authors: CHOI, Hyo-Sang, LEE, Ju-Hyoung, CHO, Yong-Sun, PARK, Hyoung-Min
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Behavior; Capacity increase; Circuit faults; Coils (windings); Connection and protection apparatus; Electric potential; Electrical engineering. Electrical power engineering; Electromagnets; Electronics; Exact sciences and technology; Fault current limiters; Fault currents; Impedance; Iron; neutral line; Power demand; Power system faults; Power system stability; quench behavior; Quenching; Recovering; Recovery time; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Superconducting coils; Superconducting devices; Superconductivity; Transformer cores; transformer-type SFCL; Transformers and inductors; Various equipment and components; Voltage; Electric transformer; quench behavior; Primary winding; Protective device; Unbalanced conditions; Superconductor device; Recovery time; Fault current limiters; Damage prevention; Quenching; transformer-type SFCL; Capacity increase; Neutral line; Machine windings; Recovery (properties)
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2009.2018051

This study was to analyze the recovery characteristics for the superconducting element in the transformer-type superconducting fault current limiter (SFCL) consisted of iron core, elements in primary and secondary windings. The superconducting element was connected to the secondary windings of a transformer-type SFCL in series. In order to increase the power capacity of the SFCL, the number of the superconducting elements should be increased and the recovery time of each superconducting element should be also shortened. When the number of superconducting elements in secondary winding was increased, the recovery time of the superconducting elements according to the voltage increase in the transformer-type SFCL grew longer because of unbalanced quenching of the superconducting elements. However, as for the transformer-type SFCL that has neutral lines connected between the secondary winding and the superconducting elements, the recovery time grew shorter due to the enhancement of quenching behavior. The transformer-type SFCL with the neutral lines was more profitable for the capacity increase of the SFCL.