Study on Fault Current Limiting Characteristics of an SFCL Using Magnetic Coupling of Two Coils With Mechanical Switch Driven by Electromagnetic Repulsion Force

• Published in: IEEE transactions on applied superconductivity Vol. 24; no. 3; pp. 1 - 4
• Main Authors: Lim, Sung-Hun, Ahn, Hyeong-Joon, Park, Changkun
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Additives; Applied sciences; Circuit faults; Circuit properties; Coils; Connection and protection apparatus; Constraining; Contact; Electric, optical and optoelectronic circuits; Electrical engineering. Electrical power engineering; Electromagnetic repulsion force; Electronic circuits; Electronics; Exact sciences and technology; Faults; Iron; Joining; Limiting; magnetic coupling; mechanical switch; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; short-circuit test; Superconducting devices; Superconducting Fault Current Limiter (SFCL); Superconductivity; Switches; Switching, multiplexing, switched capacity circuits; Windings; Magnetic flux; Electromagnetism; Superconducting Fault Current Limiter (SFCL); Protective device; Electromagnetic force; Superconductor device; Fault current limiters; Damage prevention; Fault currents; Current limiter; short-circuit test; Short circuit; Magnetic coupling; Electromagnetic repulsion force; mechanical switch; Parallel connection; Selector switch; High temperature superconductor
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2013.2284853

In this paper, the superconducting fault current limiter (SFCL) using magnetic coupling of two coils with mechanical switch, which the extra driving coil to drive it unlike the previous hybrid SFCL was not required, was suggested. The operational principle of the suggested SFCL using magnetic coupling of two coils with the mechanical switch is basically the same as one without mechanical switch, except that the mechanical switch is driven by the electromagnetic repulsion force generated by the magnetic flux between two coils comprising the SFCL. With the operation of the mechanical switch, the fault current flowing through the SFCL using magnetic coupling of two coils can be commutated from the magnetically coupled two coils into the coil operated as the current limiting reactor (CLR) immediately after the fault occurs, which is contributed to the fault current limiting operation of this SFCL. To verify the operation of the suggested SFCL, the mechanical switch with electromagnetic contact comprised of the fixed and the moving parts, which were located just above open iron core wound by two parallel connected coils, was designed and fabricated. With the fabricated mechanical switch, the short-circuit tests of the SFCL with the suggested mechanical switch were carried out. Through the analysis on the results of the short-circuit tests, the current limiting characteristics of the suggested SFCL with the mechanical switch could be confirmed to be improved effectively with the reduction of the power burden of the high- TC superconducting (HTSC) element comprising the SFCL.