Thermal and electrical properties of thermal-grease-insulated REBCO superconducting coils with respect to winding tension
- Authors
- Song, Jung-Bin; Choi, Yoon Hyuck; Yang, Dong Gyu; Kim, Young-Gyun; Kim, Seong-Gyeom; Choi, Yeon Suk; Lee, Haigun
- Issue Date
- 9월-2017
- Publisher
- KOREAN INST METALS MATERIALS
- Keywords
- superconductors; electrical properties; thermal conductivity; grease insulation; winding tension
- Citation
- METALS AND MATERIALS INTERNATIONAL, v.23, no.5, pp.1050 - 1055
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- METALS AND MATERIALS INTERNATIONAL
- Volume
- 23
- Number
- 5
- Start Page
- 1050
- End Page
- 1055
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/82483
- DOI
- 10.1007/s12540-017-7022-0
- ISSN
- 1598-9623
- 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.
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