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Experimental studies of the quench behaviour of MgB<inf>2</inf> superconducting wires for fault current limiter applications

Ye, L and Majoros, M and Campbell, AM and Coombs, T and Astill, D and Harrison, S and Husband, M and Rindfleisch, M and Tomsic, M (2007) Experimental studies of the quench behaviour of MgB<inf>2</inf> superconducting wires for fault current limiter applications. Superconductor Science and Technology, 20. pp. 621-628. ISSN 0953-2048

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Abstract

Various MgB 2 wires with different sheath materials provided by Hyper Tech Research Inc., have been tested in the superconducting fault current limiter (SFCL) desktop tester at 24-26K in a self-field. Samples 1 and 2 are similarly fabricated monofilamentary MgB 2 wires with a sheath of CuNi, except that sample 2 is doped with SiC and Mg addition. Sample 3 is a CuNi sheathed multifilamentary wire with Cu stabilization and Mg addition. All the samples with Nb barriers have the same diameter of 0.83mm and superconducting fractions ranging from 15% to 27% of the total cross section. They were heat-treated at temperatures of 700 °C for a hold time of 20-40min. Current limiting properties of MgB 2 wires subjected to pulse overcurrents have been experimentally investigated in an AC environment in the self-field at 50Hz. The quench currents extracted from the pulse measurements were in a range of 200-328A for different sa mples, corresponding to an average engineering critical current density (J e ) of around 4.8 × 10 4 Acm -2 at 25K in the self-field, based on the 1νVcm -1 criterion. This work is intended to compare the quench behaviour in the Nb-barrier monofilamentary and multifilamentary MgB 2 wires with CuNi and Cu/CuNi sheaths. The experimental results can be applied to the design of fault current limiter applications based on MgB 2 wires. © IOP Publishing Ltd.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:10
Last Modified: 03 Aug 2017 03:01
DOI: