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research article

Heat transfer monitoring between quenched high-temperature superconducting coated conductors and liquid nitrogen

Rubeli, Thomas
•
Colangelo, Daniele  
•
Dutoit, Bertrand  
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2015
Progress in Superconductivity and Cryogenics

High-temperature superconducting coated conductors (HTS-CCs) are good candidates for resistive superconducting fault current limiter (RSFCL) applications. However, the high current density they can carry and their low thermal diffusivity expose them to the risk of thermal instability. In order to find the best compromise between stability and cost, it is important to study the heat transfer between HTS-CCs and the liquid nitrogen (LN2) bath. This paper presents an experimental method to monitor in real-time the temperature of a quenched HTS-CC during a current pulse. The current and the associated voltage are measured, giving a precise knowledge of the amount of energy dissipated in the tape. These values are compared with an adiabatic numerical thermal model which takes into account heat capacity temperature dependence of the stabilizer and substrate. The result is a precise estimation of the heat transfer to the liquid nitrogen bath at each time step. Measurements were taken on a bare tape and have been repeated using increasing Kapton® insulation layers. The different heat exchange regimes can be clearly identified. This experimental method enables us to characterize the recooling process after a quench. Finally, suggestions are done to reduce the temperature increase of the tape, at a rated current and given limitation time, using different thermal insulation thicknesses.

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Type
research article
DOI
10.9714/psac.2015.17.1.010
Author(s)
Rubeli, Thomas
Colangelo, Daniele  
Dutoit, Bertrand  
Vojenčiak, Michal
Date Issued

2015

Published in
Progress in Superconductivity and Cryogenics
Volume

17

Issue

1

Start page

10

End page

13

Subjects

Resistive superconducting fault current limiter

•

high-temperature superconducting coated conductors

•

heat-transfer

•

thermal stability

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SUPRA  
Available on Infoscience
April 13, 2015
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/113006
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