Test of a 1 kA superconducting fault current limiter for DC applications

A low voltage fault current limiter (FCL) having a nominal current of 1 kA has been set up using switching elements based on YBCO thin films fabricated by reactive thermal co-evaporation. The films showed critical current densities exceeding 1 MA/cm/sup 2/ @ 77 K. After patterning and contacting the...

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Veröffentlicht in:	IEEE transactions on applied superconductivity 2005-06, Vol.15 (2), p.1986-1989
Hauptverfasser:	Kraemer, H.-P., Schmidt, W., Utz, B., Wacker, B., Neumueller, H.-W., Ahlf, G., Hartig, R.
Format:	Artikel
Sprache:	eng
Schlagworte:	APPLICATIONS Applied sciences Assembly Circuit properties Connection and protection apparatus COPPER OXIDE Critical current density CURRENT DENSITY Current limiters Electric, optical and optoelectronic circuits Electrical engineering. Electrical power engineering Electronic circuits Electronics Exact sciences and technology Fault current limiter Fault current limiters Faults LIQUID NITROGEN Low voltage Nitrogen Patterning Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices short circuit current stand-alone power systems Superconducting devices Superconducting films Superconducting thin films Superconducting transmission lines SUPERCONDUCTIVITY SUPERCONDUCTORS Switching Switching, multiplexing, switched capacity circuits Testing Testing, measurement, noise and reliability THIN FILMS YBCO superconductors YBCO thin films Yttrium barium copper oxide YTTRIUM OXIDE
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Beschreibung
Zusammenfassung:	A low voltage fault current limiter (FCL) having a nominal current of 1 kA has been set up using switching elements based on YBCO thin films fabricated by reactive thermal co-evaporation. The films showed critical current densities exceeding 1 MA/cm/sup 2/ @ 77 K. After patterning and contacting the films, the elements have been assembled in a closed cryostat for operation in a liquid nitrogen bath. The FCL model was successfully tested using prospective fault currents from 25 kA to 150 kA. The electric data show a peak current of 2.7 kA within 1 ms and a limitation to approximately nominal current within 5 ms. Due to this fast response of the YBCO switching elements, FCL coupled grids can be instantaneously decoupled during a fault, leaving the faultless part of the grid practically unimpaired.
ISSN:	1051-8223 1558-2515
DOI:	10.1109/TASC.2005.849433