Over critical-current behaviour of Bi-2223 tapes [for fault current limiters]
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY(1999)
Abstract
The authors have tested the response of Bi-2223 tapes in over-critical current conditions with a view to exploring this material's prospects for fault current limiter applications. Silver and silver-alloy clad multifilamentary tapes have been put in series with a transformer and a resistor. Currents exceeding I/sub c/ were allowed to flow through the samples when the resistor was short-circuited. AC peak currents up to 100 I/sub c/ (about 2000 A) have thus been applied to the samples for up to 50 ms. The authors measured the samples' resistivity and electric field as a function of the applied current. Samples had a resistivity of 0.6 /spl mu/ohmcm for peak currents up to several tens I/sub c/ and no sample degradation was observed. However, a resistivity of nearly 10 /spl mu/ohmcm was measured for peak currents over 2000 A and samples were damaged by heating effects. The electric field was 2.2 V/m for a current of 400 A. Therefore, controlling a 400 A fault current (about 20 I/sub c/) would require 0.45 km of tape for a 1 kV fault current limiter.
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Key words
bismuth compounds,calcium compounds,copper compounds,electric field measurement,electrical resistivity,fault current limiters,high-temperature superconductors,multifilamentary superconductors,strontium compounds,superconducting devices,superconducting tapes,0.45 km,0.6 muohmcm,1 kV,10 muohmcm,2000 A,400 A,50 ms,AC peak currents,Bi-2223 tapes,BiSr/sub 2/Ca/sub 2/Cu/sub 2/O/sub 3/,HTSC,applied current,electric field measurement,multifilamentary tapes,over-critical current conditions,resistivity measurement,superconducting fault current limiters,
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