Effects of impregnating materials on thermal and electrical stabilities of the hts racetrack pancake coils without turn-to-turn insulation

Hyun Jin Shin, Kwang Lok Kim, Yoon Hyuck Choi, Oh Jun Kwon, Seungyong Hahn, Yukikazu Iwasa, Haigun Lee

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

A high temperature superconducting (HTS) coil without turn-to-turn insulation is proposed for the field coil of a wind turbine. In the case of the field coil, epoxy impregnation is generally necessary to protect the coil from mechanical disturbances by time-varying magnetic fields and rotational vibrations to provide high mechanical integrity. This study examined the thermal and electrical stabilities of non-insulated GdBCO racetrack pancake coils impregnated with CTD-521, Stycast 2850 FT, and paraffin through cool down, over-current, and repetitive cooling tests. Among the three epoxy impregnated coils, the Stycast 2850 FT-impregnated coil exhibited the best thermal and electrical stabilities during over-current testing. In repetitive cooling conditions, the CTD-521-impregnated coil exhibited less degradation of its superconducting property due to the well-matching of the thermal contraction between the GdBCO racetrack pancake coil and the epoxy.

Original languageEnglish
Article number7700404
JournalIEEE Transactions on Applied Superconductivity
Volume23
Issue number3
DOIs
Publication statusPublished - 2013 Feb 8

Fingerprint

impregnating
insulation
Insulation
thermal stability
coils
Cooling
charge transfer devices
field coils
Impregnation
Paraffin
Wind turbines
Paraffins
Magnetic fields
Degradation
cooling
Testing
wind turbines
paraffins
Hot Temperature
integrity

Keywords

  • Coil impregnation
  • CTD-521
  • GdBCO racetrack coil
  • paraffin
  • Stycast 2850 FT

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Effects of impregnating materials on thermal and electrical stabilities of the hts racetrack pancake coils without turn-to-turn insulation. / Shin, Hyun Jin; Kim, Kwang Lok; Choi, Yoon Hyuck; Kwon, Oh Jun; Hahn, Seungyong; Iwasa, Yukikazu; Lee, Haigun.

In: IEEE Transactions on Applied Superconductivity, Vol. 23, No. 3, 7700404, 08.02.2013.

Research output: Contribution to journalArticle

Shin, Hyun Jin ; Kim, Kwang Lok ; Choi, Yoon Hyuck ; Kwon, Oh Jun ; Hahn, Seungyong ; Iwasa, Yukikazu ; Lee, Haigun. / Effects of impregnating materials on thermal and electrical stabilities of the hts racetrack pancake coils without turn-to-turn insulation. In: IEEE Transactions on Applied Superconductivity. 2013 ; Vol. 23, No. 3.
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