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

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

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)1050-1055
Number of pages6
JournalMetals and Materials International
Volume23
Issue number5
DOIs
Publication statusPublished - 2017 Sep 1

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

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