Protection and quench detection of YBCO coils results with small test coil assemblies

Frederic Trillaud; Ing Chea Ang; Woo Seok Kim; Haigun G. Lee; Yukikazu Iwasa; John P. Voccio

doi:10.1109/TASC.2007.899953

Protection and quench detection of YBCO coils results with small test coil assemblies

Frederic Trillaud^*, Ing Chea Ang, Woo Seok Kim, Haigun G. Lee, Yukikazu Iwasa, John P. Voccio

^*Corresponding author for this work

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

23 Citations (Scopus)

Abstract

This paper presents the results of an experimental and theoretical study of the stability and protection of small test coil assemblies wound with second-generation (2G) High-Temperature Superconducting (HTS) wires. The study, conducted as a part of the efforts to improve the design and applicability of YBCO wire technology to real-life power devices, such as magnets, focused on two specific issues: 1) internal voltage developed within the winding resulting from a spatially nonuniform normal zone in a coil that is effectively short-circuited across its terminals; and 2) detection of a localized "hot spot" with Acoustic Emission (AE) signals to complement the usual resistive voltage technique. Each test coil assembly, a stack of four single YBCO pancakes electrically connected in series and shunted by a "persistent- mode" switch, simulated a power-supply driven magnet a moment after a quench zone appeared within the winding. A heater was incorporated into each pancake coil to drive 25% (one pancake), 50%, 75%, or 100% (four pancakes) of the test coil assembly. Measured internal voltages arising from different quench sizes and distributions are compared with the results of the simulation. "Hot-spot" induced AE signals are also presented on a single coil to determine if AE signals may be useful to facilitate the early detection of a normal zone in HTS windings.

Original language	English
Pages (from-to)	2450-2453
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	17
Issue number	2
DOIs	https://doi.org/10.1109/TASC.2007.899953
Publication status	Published - 2007 Jun

Bibliographical note

Funding Information:
Manuscript received August 29, 2006. Funding support was provided by Wright Patterson Air Force Base under the Phase II SBIR program entitled “Superconducting Developments for Compact Power and Energy Systems” (contract number FA8650-05-M-2626). The work was carried out at the Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology (FBML/MIT).

Keywords

HTS magnet
Internal voltage
Quench detection
Quench protection
YBCO wires

ASJC Scopus subject areas

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

Access to Document

10.1109/TASC.2007.899953

Cite this

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title = "Protection and quench detection of YBCO coils results with small test coil assemblies",

abstract = "This paper presents the results of an experimental and theoretical study of the stability and protection of small test coil assemblies wound with second-generation (2G) High-Temperature Superconducting (HTS) wires. The study, conducted as a part of the efforts to improve the design and applicability of YBCO wire technology to real-life power devices, such as magnets, focused on two specific issues: 1) internal voltage developed within the winding resulting from a spatially nonuniform normal zone in a coil that is effectively short-circuited across its terminals; and 2) detection of a localized {"}hot spot{"} with Acoustic Emission (AE) signals to complement the usual resistive voltage technique. Each test coil assembly, a stack of four single YBCO pancakes electrically connected in series and shunted by a {"}persistent- mode{"} switch, simulated a power-supply driven magnet a moment after a quench zone appeared within the winding. A heater was incorporated into each pancake coil to drive 25\% (one pancake), 50\%, 75\%, or 100\% (four pancakes) of the test coil assembly. Measured internal voltages arising from different quench sizes and distributions are compared with the results of the simulation. {"}Hot-spot{"} induced AE signals are also presented on a single coil to determine if AE signals may be useful to facilitate the early detection of a normal zone in HTS windings.",

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author = "Frederic Trillaud and Ang, \{Ing Chea\} and Kim, \{Woo Seok\} and Lee, \{Haigun G.\} and Yukikazu Iwasa and Voccio, \{John P.\}",

note = "Funding Information: Manuscript received August 29, 2006. Funding support was provided by Wright Patterson Air Force Base under the Phase II SBIR program entitled “Superconducting Developments for Compact Power and Energy Systems” (contract number FA8650-05-M-2626). The work was carried out at the Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology (FBML/MIT).",

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AU - Voccio, John P.

N1 - Funding Information: Manuscript received August 29, 2006. Funding support was provided by Wright Patterson Air Force Base under the Phase II SBIR program entitled “Superconducting Developments for Compact Power and Energy Systems” (contract number FA8650-05-M-2626). The work was carried out at the Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology (FBML/MIT).

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N2 - This paper presents the results of an experimental and theoretical study of the stability and protection of small test coil assemblies wound with second-generation (2G) High-Temperature Superconducting (HTS) wires. The study, conducted as a part of the efforts to improve the design and applicability of YBCO wire technology to real-life power devices, such as magnets, focused on two specific issues: 1) internal voltage developed within the winding resulting from a spatially nonuniform normal zone in a coil that is effectively short-circuited across its terminals; and 2) detection of a localized "hot spot" with Acoustic Emission (AE) signals to complement the usual resistive voltage technique. Each test coil assembly, a stack of four single YBCO pancakes electrically connected in series and shunted by a "persistent- mode" switch, simulated a power-supply driven magnet a moment after a quench zone appeared within the winding. A heater was incorporated into each pancake coil to drive 25% (one pancake), 50%, 75%, or 100% (four pancakes) of the test coil assembly. Measured internal voltages arising from different quench sizes and distributions are compared with the results of the simulation. "Hot-spot" induced AE signals are also presented on a single coil to determine if AE signals may be useful to facilitate the early detection of a normal zone in HTS windings.

AB - This paper presents the results of an experimental and theoretical study of the stability and protection of small test coil assemblies wound with second-generation (2G) High-Temperature Superconducting (HTS) wires. The study, conducted as a part of the efforts to improve the design and applicability of YBCO wire technology to real-life power devices, such as magnets, focused on two specific issues: 1) internal voltage developed within the winding resulting from a spatially nonuniform normal zone in a coil that is effectively short-circuited across its terminals; and 2) detection of a localized "hot spot" with Acoustic Emission (AE) signals to complement the usual resistive voltage technique. Each test coil assembly, a stack of four single YBCO pancakes electrically connected in series and shunted by a "persistent- mode" switch, simulated a power-supply driven magnet a moment after a quench zone appeared within the winding. A heater was incorporated into each pancake coil to drive 25% (one pancake), 50%, 75%, or 100% (four pancakes) of the test coil assembly. Measured internal voltages arising from different quench sizes and distributions are compared with the results of the simulation. "Hot-spot" induced AE signals are also presented on a single coil to determine if AE signals may be useful to facilitate the early detection of a normal zone in HTS windings.

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Protection and quench detection of YBCO coils results with small test coil assemblies

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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