Current cycling test on HTSC for Westinghouse current leads

Author

Selvaggi, J.A. ; Wu, J.L. ; Bock, J.

Author_Institution

Eriez Magnetics, Erie, PA, USA

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

782

Lastpage

784

Abstract

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.<>

Keywords

bismuth compounds; cable testing; contact resistance; critical current density (superconductivity); electric resistance measurement; electron device manufacture; high-temperature superconductors; reliability; strontium compounds; superconducting cables; superconducting device testing; 100 to 500 A; 2 muohm; 50 A; 77 K; BiSrCaCuO; BiSrCaCuO 2212 phase; Westinghouse current leads; ceramic high temperature superconductor; contact joint resistance; copper terminals; current cycling tests; cycling current magnitude; cylindrical rod; high temperature superconducting current leads; liquid nitrogen; magnetic separator; melt cast process; power supply limitation; reliability evaluation; repetitive current ramping operations; Ceramics; Contact resistance; Copper; High temperature superconductors; Magnetic liquids; Magnetic separation; Nitrogen; Particle separators; Superconducting magnets; Testing;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402664

Filename

402664