Thermal and Electrical Properties of Thermal-Grease-Insulated REBCO Superconducting Coils With Respect to Winding Tension
- 주제(키워드) superconductors , electrical properties , thermal conductivity , grease insulation , winding tension
- 발행기관 대한금속·재료학회
- 발행년도 2017
- 총서유형 Journal
- DOI http://dx.doi.org/10.1007/s12540-017-7022-0
- KCI ID ART002258643
- 본문언어 영어
초록/요약
This study investigates the thermal and electrical characteristics of a silicon-based grease insulation (GI) GdBCOcoil with respect to the winding tension through charge, sudden discharge, and over-current tests. Charge and suddendischarge test results demonstrate that the charging/discharging delay time increases as the winding tensionincreases; 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 enhancedwith an increased winding tension resulting from improved thermal contact and the decrease in the electrical contactresistance between the turn-to-turn layers of the coil. Thus, as the winding tension increases, the charging/dischargingrates decrease whereas the thermal/electrical stabilities improve. Overall, selecting the appropriate windingtension for a GI coil is critical for achieving thermal/electrical stabilities, as well as ameliorating the charging/dischargingdelay phenomenon generally observed in a no-insulation coil.
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