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Thermal and electrical properties of thermal-grease-insulated REBCO superconducting coils with respect to winding tension

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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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Authors and Affiliations

  1. Department of Materials Science & Engineering, Korea University, Seoul, 02841, Republic of Korea

    Jung-Bin Song, Yoon Hyuck Choi, Dong Gyu Yang, Young-Gyun Kim, Seong-Gyeom Kim & Haigun Lee

  2. Division of Materials Science, Korea Basic Science Institute, Daejeon, 34133, Republic of Korea

    Yeon Suk Choi

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  1. Jung-Bin Song
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  2. Yoon Hyuck Choi
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  3. Dong Gyu Yang
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  4. Young-Gyun Kim
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  5. Seong-Gyeom Kim
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  6. Yeon Suk Choi
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  7. Haigun Lee
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Correspondence to Haigun Lee.

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Song, JB., Choi, Y.H., Yang, D.G. et al. Thermal and electrical properties of thermal-grease-insulated REBCO superconducting coils with respect to winding tension. Met. Mater. Int. 23, 1050–1055 (2017). https://doi.org/10.1007/s12540-017-7022-0

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  • DOI: https://doi.org/10.1007/s12540-017-7022-0

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