Quench development in Bi-2212 bulk coils during quenches

Hye Rim Kim; Jungwook Sim; Inji Choi; Seong Woo Yim; Haigun Lee; Ok Bae Hyun

doi:10.1109/TASC.2007.898485

Quench development in Bi-2212 bulk coils during quenches

Hye Rim Kim, Jungwook Sim, Inji Choi, Seong Woo Yim, Haigun Lee, Ok Bae Hyun

Department of Materials Science and Engineering

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

1 Citation (Scopus)

Abstract

We investigated the quench development in resistive superconducting fault current limiters (SFCLs) based on Bi₂Sr₂CaCu ₂O₈ (Bi-2212) bulk coils. In order to protect them from hot spot formation, the bulk coils were either attached with a metal shunt layer or connected with a shunt coil in parallel. The bulk coils also had a plastic support for enhanced mechanical strength and insulation. The SFCLs were subjected to simulated AC fault currents for quench measurements. They were immersed in liquid nitrogen during the experiment for effective cooling. The resistance of the Bi-2212 bulk coil stayed low for a few milliseconds, until it increased rapidly. The increase was more rapid in the SFCL with a shunt coil than with a shunt layer. Once the quench was completed, the resistance increased at slower rates. The average temperature of the bulk coil reached about 230 K at 3 cycles after quench start at application voltage of 2.4 V_rms/cm with a shunt coil, and at 0.4 V_rms/cm with a shunt layer. The resistance development in Bi-2212 bulk coils could be quantitatively explained with the concept of transfer of heat generated during quenches to the liquid nitrogen as well as within the Bi-2212 bulk. The fault period was divided into three regions: flux-flow region, region prior-to quench completion, and region after quench completion. Resistance was calculated separately for each region and compared with data. The results agreed well with data.

Original language	English
Pages (from-to)	1875-1878
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	17
Issue number	2
DOIs	https://doi.org/10.1109/TASC.2007.898485
Publication status	Published - 2007 Jun

Keywords

Bi-2212 bulk
Heat transfer
Quench
Superconducting fault current limiter

ASJC Scopus subject areas

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

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10.1109/TASC.2007.898485

Cite this

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title = "Quench development in Bi-2212 bulk coils during quenches",

abstract = "We investigated the quench development in resistive superconducting fault current limiters (SFCLs) based on Bi2Sr2CaCu 2O8 (Bi-2212) bulk coils. In order to protect them from hot spot formation, the bulk coils were either attached with a metal shunt layer or connected with a shunt coil in parallel. The bulk coils also had a plastic support for enhanced mechanical strength and insulation. The SFCLs were subjected to simulated AC fault currents for quench measurements. They were immersed in liquid nitrogen during the experiment for effective cooling. The resistance of the Bi-2212 bulk coil stayed low for a few milliseconds, until it increased rapidly. The increase was more rapid in the SFCL with a shunt coil than with a shunt layer. Once the quench was completed, the resistance increased at slower rates. The average temperature of the bulk coil reached about 230 K at 3 cycles after quench start at application voltage of 2.4 Vrms/cm with a shunt coil, and at 0.4 Vrms/cm with a shunt layer. The resistance development in Bi-2212 bulk coils could be quantitatively explained with the concept of transfer of heat generated during quenches to the liquid nitrogen as well as within the Bi-2212 bulk. The fault period was divided into three regions: flux-flow region, region prior-to quench completion, and region after quench completion. Resistance was calculated separately for each region and compared with data. The results agreed well with data.",

keywords = "Bi-2212 bulk, Heat transfer, Quench, Superconducting fault current limiter",

author = "Kim, {Hye Rim} and Jungwook Sim and Inji Choi and Yim, {Seong Woo} and Haigun Lee and Hyun, {Ok Bae}",

note = "Funding Information: Manuscript received August 29, 2006. This work was supported by a grant from the Electric Power Industry Evaluation and Planning funded by the Ministry of Commerce, Industry, and Energy, Republic of Korea. H.-R. Kim, I. Choi, S.-W. Yim, and O.-B. Hyun are with the Korea Electric Power Research Institute, Daejeon 305-380, Korea (e-mail: hrkim@kepri.re.kr). J. Sim and H. Lee are with the Korea University, Seoul 136-178, Korea (e-mail: simwork@paran.com). Digital Object Identifier 10.1109/TASC.2007.898485",

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AU - Yim, Seong Woo

AU - Lee, Haigun

AU - Hyun, Ok Bae

N1 - Funding Information: Manuscript received August 29, 2006. This work was supported by a grant from the Electric Power Industry Evaluation and Planning funded by the Ministry of Commerce, Industry, and Energy, Republic of Korea. H.-R. Kim, I. Choi, S.-W. Yim, and O.-B. Hyun are with the Korea Electric Power Research Institute, Daejeon 305-380, Korea (e-mail: hrkim@kepri.re.kr). J. Sim and H. Lee are with the Korea University, Seoul 136-178, Korea (e-mail: simwork@paran.com). Digital Object Identifier 10.1109/TASC.2007.898485

PY - 2007/6

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N2 - We investigated the quench development in resistive superconducting fault current limiters (SFCLs) based on Bi2Sr2CaCu 2O8 (Bi-2212) bulk coils. In order to protect them from hot spot formation, the bulk coils were either attached with a metal shunt layer or connected with a shunt coil in parallel. The bulk coils also had a plastic support for enhanced mechanical strength and insulation. The SFCLs were subjected to simulated AC fault currents for quench measurements. They were immersed in liquid nitrogen during the experiment for effective cooling. The resistance of the Bi-2212 bulk coil stayed low for a few milliseconds, until it increased rapidly. The increase was more rapid in the SFCL with a shunt coil than with a shunt layer. Once the quench was completed, the resistance increased at slower rates. The average temperature of the bulk coil reached about 230 K at 3 cycles after quench start at application voltage of 2.4 Vrms/cm with a shunt coil, and at 0.4 Vrms/cm with a shunt layer. The resistance development in Bi-2212 bulk coils could be quantitatively explained with the concept of transfer of heat generated during quenches to the liquid nitrogen as well as within the Bi-2212 bulk. The fault period was divided into three regions: flux-flow region, region prior-to quench completion, and region after quench completion. Resistance was calculated separately for each region and compared with data. The results agreed well with data.

AB - We investigated the quench development in resistive superconducting fault current limiters (SFCLs) based on Bi2Sr2CaCu 2O8 (Bi-2212) bulk coils. In order to protect them from hot spot formation, the bulk coils were either attached with a metal shunt layer or connected with a shunt coil in parallel. The bulk coils also had a plastic support for enhanced mechanical strength and insulation. The SFCLs were subjected to simulated AC fault currents for quench measurements. They were immersed in liquid nitrogen during the experiment for effective cooling. The resistance of the Bi-2212 bulk coil stayed low for a few milliseconds, until it increased rapidly. The increase was more rapid in the SFCL with a shunt coil than with a shunt layer. Once the quench was completed, the resistance increased at slower rates. The average temperature of the bulk coil reached about 230 K at 3 cycles after quench start at application voltage of 2.4 Vrms/cm with a shunt coil, and at 0.4 Vrms/cm with a shunt layer. The resistance development in Bi-2212 bulk coils could be quantitatively explained with the concept of transfer of heat generated during quenches to the liquid nitrogen as well as within the Bi-2212 bulk. The fault period was divided into three regions: flux-flow region, region prior-to quench completion, and region after quench completion. Resistance was calculated separately for each region and compared with data. The results agreed well with data.

KW - Bi-2212 bulk

KW - Heat transfer

KW - Quench

KW - Superconducting fault current limiter

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Quench development in Bi-2212 bulk coils during quenches

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Keywords

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