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Development and Test of a Cooling System for a 154 kV Superconducting Fault Current Limiter
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 Title & Authors
Development and Test of a Cooling System for a 154 kV Superconducting Fault Current Limiter
Kim, Heesun; Han, Young Hee; Yang, Seong-Eun; Yu, Seung-Duck; Park, Byung Jun; Park, Kijun; Yoo, Jaeun; Kim, Hye-Rim; In, Sehwan; Hong, Yong Joo; Yeom, Hankil;
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The superconducting fault current limiter (SFCL) is an electric power device that limits the fault current immediately in a power grid. Korea Electric Power Corporation (KEPCO) has been developing a 154 kV, 2 kA SFCL since 2011 to protect power grids from increasing fault current and improve the stability and quality of electric power. This SFCL adopts 2G YBCO wires and operates at 71 K and 5 bars. In this paper, a cooling system for the 154 kV SFCL and its cooling test results are reported. This cooling system uses a Stirling-type cooler to make sub-cooled liquid nitrogen (), which cools the superconductor modules of the SFCL. The is circulated between the cooler and the cryostat that contains superconductor modules. The also plays the role of a high voltage insulator between the modules and the cryostat, so the pressure was maintained at 5 bars for high insulation performance. After installation in a test site, the cooling characteristics of the system were tested. In this operation test, some important data were measured such as temperature distribution in , pressure change, performance of the heat exchanger, and cooling capacity of the total system. Consequently, the results indicate that the cooling system operates well as designed.
superconducting fault current limiter;cooling system;test operation;liquid nitrogen;YBCO;
 Cited by
Protection Scheme of a 154-kV SFCL Test Transmission Line at the KEPCO Power Testing Center, IEEE Transactions on Applied Superconductivity, 2017, 27, 4, 1  crossref(new windwow)
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H.-R. Kim, S.-E. Yang, S.-D. Yu, H. Kim, W.-S. Kim, J. Park, O.-B Hyun, B.-M. Yang, J. Sim and Y.-G Kim, "Installation and testing of SFCLs", IEEE Trans. Appl. Supercond., vol. 22, No. 3, 2012.

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K. Nam, B. -Y. Seok, J. J. Byun and H. -M. Chang, "Suppression of bubbles in subcooled liquid nitrogen under heat impulse", Cryogenics 47, pp. 442-449, 2007 crossref(new window)