Current cycling test on HTSC for Westinghouse current leads

Current cycling test on HTSC for Westinghouse current leads

To evaluate the reliability of high temperature superconducting current leads for repetitive current ramping operations such as in a magnetic separator, a ceramic high temperature superconductor with its copper terminals was subjected to current cycling tests in liquid nitrogen. The superconductor,...

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Veröffentlicht in:IEEE transactions on applied superconductivity 1995-06, Vol.5 (2), p.782-784
Hauptverfasser: Selvaggi, J.A., Wu, J.L., Bock, J.
Format: Artikel
Sprache:eng
Schlagworte:
Ceramics
Contact resistance
Copper
High temperature superconductors
Magnetic liquids
Magnetic separation
Nitrogen
Particle separators
Superconducting magnets
Testing
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Wu, J.L.
Bock, J.
description To evaluate the reliability of high temperature superconducting current leads for repetitive current ramping operations such as in a magnetic separator, a ceramic high temperature superconductor with its copper terminals was subjected to current cycling tests in liquid nitrogen. The superconductor, a cylindrical rod of BSCCO-2212 fabricated by a melt cast process, has an initial J/sub c/ (B=O) of 970 A/cm/sup 2/ at 77 K and a total contact joint resistance for both terminals of 2 /spl mu//spl Omega/ in the current range of 100 to 500 A. Due to power supply limitation, the cycling current magnitude was set at 50 A. The cycling rate was 1 cycle per minute, 30 seconds on 30 seconds off. After approximately 80000 cycles and 250000 cycles, measurements of J/sub c/ and contact joint resistance were repeated. No degradation in either J/sub c/ or contact joint resistance was detected. The testing and the test results are discussed in detail.< >
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The superconductor, a cylindrical rod of BSCCO-2212 fabricated by a melt cast process, has an initial J/sub c/ (B=O) of 970 A/cm/sup 2/ at 77 K and a total contact joint resistance for both terminals of 2 /spl mu//spl Omega/ in the current range of 100 to 500 A. Due to power supply limitation, the cycling current magnitude was set at 50 A. The cycling rate was 1 cycle per minute, 30 seconds on 30 seconds off. After approximately 80000 cycles and 250000 cycles, measurements of J/sub c/ and contact joint resistance were repeated. No degradation in either J/sub c/ or contact joint resistance was detected. 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subjects Ceramics
Contact resistance
Copper
High temperature superconductors
Magnetic liquids
Magnetic separation
Nitrogen
Particle separators
Superconducting magnets
Testing
title Current cycling test on HTSC for Westinghouse current leads
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