Study on the Effect of Metal Protection Rings in No-Insulation HTS Coils

Seok Beom Kim; Takahiro Tatsuta; Daisuke Nishikawa; Kohei Miyamoto; Hiroshi Ueda

doi:10.1109/TASC.2020.2976066

Study on the Effect of Metal Protection Rings in No-Insulation HTS Coils

Seok Beom Kim, Takahiro Tatsuta, Daisuke Nishikawa, Kohei Miyamoto, Hiroshi Ueda

Research output: Contribution to journal › Article › peer-review

Abstract

In this study, we propose the installation of multiple metal protection rings on the outermost turn of no-insulation (NI) coils to improve thermal, mechanical, and electrical stability. The current bypass characteristics in the transverse direction within an NI test coil wound with 10 turns of GdBCO wire and wrapped with 8 turns of Cu tape around the outermost layer were experimentally investigated for various amounts of heating by a heater and various heater positions. To confirm the electrical effectiveness of the metal protection rings, 8-turn Cu tape was used as the rings. A bypass current from the outermost part of the test coils to the Cu tape was observed. The local temperature increase due to thermal disturbance was suppressed.

Original language	English
Article number	9007687
Journal	IEEE Transactions on Applied Superconductivity
Volume	30
Issue number	4
DOIs	https://doi.org/10.1109/TASC.2020.2976066
Publication status	Published - Jun 2020

Keywords

No-insulation HTS coil
current bypass
electromagnetic force
metal protection ring
thermal stress

ASJC Scopus subject areas

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

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abstract = "In this study, we propose the installation of multiple metal protection rings on the outermost turn of no-insulation (NI) coils to improve thermal, mechanical, and electrical stability. The current bypass characteristics in the transverse direction within an NI test coil wound with 10 turns of GdBCO wire and wrapped with 8 turns of Cu tape around the outermost layer were experimentally investigated for various amounts of heating by a heater and various heater positions. To confirm the electrical effectiveness of the metal protection rings, 8-turn Cu tape was used as the rings. A bypass current from the outermost part of the test coils to the Cu tape was observed. The local temperature increase due to thermal disturbance was suppressed.",

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AU - Miyamoto, Kohei

AU - Ueda, Hiroshi

PY - 2020/6

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AB - In this study, we propose the installation of multiple metal protection rings on the outermost turn of no-insulation (NI) coils to improve thermal, mechanical, and electrical stability. The current bypass characteristics in the transverse direction within an NI test coil wound with 10 turns of GdBCO wire and wrapped with 8 turns of Cu tape around the outermost layer were experimentally investigated for various amounts of heating by a heater and various heater positions. To confirm the electrical effectiveness of the metal protection rings, 8-turn Cu tape was used as the rings. A bypass current from the outermost part of the test coils to the Cu tape was observed. The local temperature increase due to thermal disturbance was suppressed.

KW - No-insulation HTS coil

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KW - electromagnetic force

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KW - thermal stress

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Study on the Effect of Metal Protection Rings in No-Insulation HTS Coils

Abstract

Keywords

ASJC Scopus subject areas

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