Quench behavior and protection in cryocooler-cooled YBCO pancake coil for SMES

Atsushi Ishiyama; Hiroshi Ueda; Yoshiaki Aoki; Koji Shikimachi; Naoki Hirano; Shigeo Nagaya

doi:10.1109/TASC.2010.2093491

Quench behavior and protection in cryocooler-cooled YBCO pancake coil for SMES

Atsushi Ishiyama, Hiroshi Ueda, Yoshiaki Aoki, Koji Shikimachi, Naoki Hirano, Shigeo Nagaya

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

23 Citations (Scopus)

Abstract

The thermal behavior of a high-temperature superconducting (HTS) coil is significantly different from that of lowtemperature superconducting (LTS) coil because it has a greater volumetric heat capacity at the temperature required for practical use. Therefore, the possibility of quench in HTS coils is much lower than that in LTS coils. In the application of the YBCO coil to Superconducting Magnetic Energy Storage (SMES) system, electrical charging and discharging are repeated; therefore, the superconducting characteristics of the YBCO coated conductor may deteriorate as a result of cyclic subjection to tensile strain. To enhance the reliability and safety of HTS coil, protection scheme assuming a quench is also required for HTS coil. In this study, we focus on the coil wound with YBCO laminated bundle (parallel) conductor supposing SMES application and investigate the characteristics of normal-zone propagation and the thermal behavior within the coil during a quench by using a newly developed computer code based on the finite element method and an equivalent circuit. And we also propose a quench detection method using observation of nonuniform current in YBCO laminated bundle conductor and discuss the validity of the detection method comparing with conventional quench-voltage detection.

Original language	English
Article number	5675702
Pages (from-to)	2398-2401
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	21
Issue number	3 PART 2
DOIs	https://doi.org/10.1109/TASC.2010.2093491
Publication status	Published - Jun 2011
Externally published	Yes

Keywords

Normal propagation
Protection
SMES
Stability

ASJC Scopus subject areas

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

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10.1109/TASC.2010.2093491

Cite this

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title = "Quench behavior and protection in cryocooler-cooled YBCO pancake coil for SMES",

abstract = "The thermal behavior of a high-temperature superconducting (HTS) coil is significantly different from that of lowtemperature superconducting (LTS) coil because it has a greater volumetric heat capacity at the temperature required for practical use. Therefore, the possibility of quench in HTS coils is much lower than that in LTS coils. In the application of the YBCO coil to Superconducting Magnetic Energy Storage (SMES) system, electrical charging and discharging are repeated; therefore, the superconducting characteristics of the YBCO coated conductor may deteriorate as a result of cyclic subjection to tensile strain. To enhance the reliability and safety of HTS coil, protection scheme assuming a quench is also required for HTS coil. In this study, we focus on the coil wound with YBCO laminated bundle (parallel) conductor supposing SMES application and investigate the characteristics of normal-zone propagation and the thermal behavior within the coil during a quench by using a newly developed computer code based on the finite element method and an equivalent circuit. And we also propose a quench detection method using observation of nonuniform current in YBCO laminated bundle conductor and discuss the validity of the detection method comparing with conventional quench-voltage detection.",

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note = "Funding Information: Y BCO coated conductors have rapidly been improving and their application to practical systems has begun. Japan{\textquoteright}s national project, “Technological Development of Yttrium-based Superconducting Power Equipment,” was started in 2008 and is supported by the New Energy and Industrial Technology Development Organization (NEDO).",

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AU - Ueda, Hiroshi

AU - Aoki, Yoshiaki

AU - Shikimachi, Koji

AU - Hirano, Naoki

AU - Nagaya, Shigeo

N1 - Funding Information: Y BCO coated conductors have rapidly been improving and their application to practical systems has begun. Japan’s national project, “Technological Development of Yttrium-based Superconducting Power Equipment,” was started in 2008 and is supported by the New Energy and Industrial Technology Development Organization (NEDO).

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N2 - The thermal behavior of a high-temperature superconducting (HTS) coil is significantly different from that of lowtemperature superconducting (LTS) coil because it has a greater volumetric heat capacity at the temperature required for practical use. Therefore, the possibility of quench in HTS coils is much lower than that in LTS coils. In the application of the YBCO coil to Superconducting Magnetic Energy Storage (SMES) system, electrical charging and discharging are repeated; therefore, the superconducting characteristics of the YBCO coated conductor may deteriorate as a result of cyclic subjection to tensile strain. To enhance the reliability and safety of HTS coil, protection scheme assuming a quench is also required for HTS coil. In this study, we focus on the coil wound with YBCO laminated bundle (parallel) conductor supposing SMES application and investigate the characteristics of normal-zone propagation and the thermal behavior within the coil during a quench by using a newly developed computer code based on the finite element method and an equivalent circuit. And we also propose a quench detection method using observation of nonuniform current in YBCO laminated bundle conductor and discuss the validity of the detection method comparing with conventional quench-voltage detection.

AB - The thermal behavior of a high-temperature superconducting (HTS) coil is significantly different from that of lowtemperature superconducting (LTS) coil because it has a greater volumetric heat capacity at the temperature required for practical use. Therefore, the possibility of quench in HTS coils is much lower than that in LTS coils. In the application of the YBCO coil to Superconducting Magnetic Energy Storage (SMES) system, electrical charging and discharging are repeated; therefore, the superconducting characteristics of the YBCO coated conductor may deteriorate as a result of cyclic subjection to tensile strain. To enhance the reliability and safety of HTS coil, protection scheme assuming a quench is also required for HTS coil. In this study, we focus on the coil wound with YBCO laminated bundle (parallel) conductor supposing SMES application and investigate the characteristics of normal-zone propagation and the thermal behavior within the coil during a quench by using a newly developed computer code based on the finite element method and an equivalent circuit. And we also propose a quench detection method using observation of nonuniform current in YBCO laminated bundle conductor and discuss the validity of the detection method comparing with conventional quench-voltage detection.

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KW - Stability

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Quench behavior and protection in cryocooler-cooled YBCO pancake coil for SMES

Abstract

Keywords

ASJC Scopus subject areas

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