Effect of Resistive Metal Cladding of HTS Tape on the Characteristic of No-Insulation Coil

This paper presents experimental and theoretical studies of the no-insulation (NI) winding method of second-generation high-temperature superconducting (HTS) wire. We compared two single pancake coils wound by two different HTS wires. One pancake coil is made of a normal HTS wire with an electroplat...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2016-06, Vol.26 (4), p.1-6
Main Authors: Kim, Jaemin, Yoon, Sangwon, Cheon, Kyekun, Shin, Kang Hwan, Hahn, Seungyoung, Kim, Dong Lak, Lee, SangGap, Lee, Hunju, Moon, Seung-Hyun
Format: Article
Language:English
Subjects:
Charging
charging delay
Circuits
Coiling
Coils (windings)
equivalent circuit model
Equivalent circuits
High-temperature superconductors
Nickel
No-insulation winding
overcurrent
Pancake coils
Stainless steels
Steel
Superconducting magnets
Superconductivity
Superconductors
turn-to-turn contact
Windings
Wire
Wires
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Summary:This paper presents experimental and theoretical studies of the no-insulation (NI) winding method of second-generation high-temperature superconducting (HTS) wire. We compared two single pancake coils wound by two different HTS wires. One pancake coil is made of a normal HTS wire with an electroplated copper stabilizer. The other pancake coil is made of the same HTS wire with the only difference in an additional outermost layer made of stainless steel. We employed an equivalent circuit model to evaluate our experimental results. We tested both coils by the same simple operating procedure consisting of two steps: first, ramping up of current from zero to holding current (IH) and second, keeping the IH at minimum 500 s. We also tested the stability of the coil wound by an HTS wire with an additional layer of stainless steel by applying a current exceeding a critical current of the coil. We observed a charging time of the metal-cladding HTS coil reduced to a quarter of copper-electroplated HTS coil.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2016.2541687