Thermal behavior of a solid nitrogen impregnated high-temperature superconducting pancake test coil under transient heating

This paper presents experimental and analytical results on a solid nitrogen impregnated high-temperature superconducting (HTS) test coil under transient heating. The test coil is a 1-layer, 10-turn single-pancake wound with Bi2223/Ag composite tape, 9-mm wide and 0.5-mm thick, with an average windin...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2001-03, Vol.11 (1), p.1852-1855
Main Authors: Isogami, H., Haid, B.J., Iwasa, Y.
Format: Article
Language:English
Subjects:
Applied sciences
Coils (windings)
COMPOSITES
CURRENT
Devices
Electrical engineering. Electrical power engineering
ELECTRONIC PRODUCTS
Exact sciences and technology
HEATING
High temperature superconductors
IMPREGNATION
Materials
NITROGEN
Operating temperature
Overcurrent
Solid nitrogen
Solids
SPECIFIC HEAT
Superconducting coils
Superconducting films
Superconducting magnets
SUPERCONDUCTIVITY
SUPERCONDUCTORS
Temperature distribution
Testing
Transient analysis
Transient heating
WINDING
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Summary:This paper presents experimental and analytical results on a solid nitrogen impregnated high-temperature superconducting (HTS) test coil under transient heating. The test coil is a 1-layer, 10-turn single-pancake wound with Bi2223/Ag composite tape, 9-mm wide and 0.5-mm thick, with an average winding diameter of 105 mm. The solid nitrogen impregnating the 0.38-mm turn-to-turn radial gaps in the winding enhances the winding's overall heat capacity significantly in the operating temperature range 30-40 K and thereby limits the test coil's temperature rise when it is subjected to overcurrent pulses. The presence of solid nitrogen within the winding improves stability against fault-mode overcurrent pulses for HTS magnets used in electric power devices.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.920209