Abstract
This study investigates the thermal and electrical characteristics of a silicon-based grease insulation (GI) GdBCO coil with respect to the winding tension through charge, sudden discharge, and over-current tests. Charge and sudden discharge test results demonstrate that the charging/discharging delay time increases as the winding tension increases; this is because the characteristic resistance of the coil decreases due to the reduced contact resistance. The over-current test results confirm that the thermal/electrical stabilities of the GI coil are considerably enhanced with an increased winding tension resulting from improved thermal contact and the decrease in the electrical contact resistance between the turn-to-turn layers of the coil. Thus, as the winding tension increases, the charging/discharging rates decrease whereas the thermal/electrical stabilities improve. Overall, selecting the appropriate winding tension for a GI coil is critical for achieving thermal/electrical stabilities, as well as ameliorating the charging/discharging delay phenomenon generally observed in a no-insulation coil.
Original language | English |
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Pages (from-to) | 1050-1055 |
Number of pages | 6 |
Journal | Metals and Materials International |
Volume | 23 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2017 Sept 1 |
Bibliographical note
Funding Information:This work was supported by the Korea Basic Science Institute under Grant D37614.
Publisher Copyright:
© 2017, The Korean Institute of Metals and Materials and Springer Science+Business Media B.V.
Keywords
- electrical properties
- grease insulation
- superconductors
- thermal conductivity
- winding tension
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry