Design and testing of a pair of current leads using bismuth compound superconductor

The thermal behavior of current leads using an oxide superconductor for the low-temperature portion has been studied. Numerical calculations predict a reduction of the necessary coolant flow rate and refrigerator input power. A pair of current leads has been manufactured where the low-temperature po...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1993-03, Vol.3 (1), p.400-403
Main Authors: Ueda, K., Bohno, T., Takita, K., Mukae, K., Uede, T., Itoh, I., Mimura, M., Uno, N., Tanaka, T.
Format: Article
Language:English
Subjects:
Applied sciences
Bars
Bismuth
Ceramic materials
Coolants
Cooling
Copper
Copper oxides
Cryogenics
Electric connection. Cables. Wiring
Electrical engineering. Electrical power engineering
Exact sciences and technology
Helium
High temperature superconductors
Lead compounds
Manufacturing
Refrigeration
Superconducting cables
Testing
Various equipment and components
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Summary:The thermal behavior of current leads using an oxide superconductor for the low-temperature portion has been studied. Numerical calculations predict a reduction of the necessary coolant flow rate and refrigerator input power. A pair of current leads has been manufactured where the low-temperature portion consists of six sintered Bi compound cylindrical bars and the high-temperature portion consists of a Cu wire bundle. The lead, cooled by gaseous helium along its entire length, is 0.9 m long and designed to carry 1 kA. The leads have been tested in the same arrangement as practical applications. The helium flow rate necessary to hold thermal equilibrium was about 80% of that for conventional copper leads. The calculation shows that power consumption of the refrigerator needed to cool high-temperature superconductor current leads with an optimum cooling scheme will be about one-third of that for conventional current leads.< >
ISSN:1051-8223
1558-2515
DOI:10.1109/77.233729