Performance test of the cryogenic cooling system for the superconducting fault current limiter

[摘要] A Superconducting Fault Current Limiter is an electric power device which limits the fault current immediately in a power grid. The SFCL must be cooled to below the critical temperature of high temperature superconductor modules. In general, they are submerged in sub-cooled liquid nitrogen for their stable thermal characteristics. To cool and maintain the target temperature and pressure of the sub-cooled liquid nitrogen, the cryogenic cooling system should be designed well with a cryocooler and coolant circulation devices. The pressure of the cryostat for the SFCL should be pressurized to suppress the generation of nitrogen bubbles in quench mode of the SFCL. In this study, we tested the performance of the cooling system for the prototype 154 kV SFCL, which consist of a Stirling cryocooler, a subcooling cryostat, a pressure builder and a main cryostat for the SFCL module, to verify the design of the cooling system and the electric performance of the SFCL. The normal operation condition of the main cryostat is 71 K and 500 kPa. This paper presents tests results of the overall cooling system.

[发布机构] Korea Institute of Machinery and Materials, Daejeon; 305-343, Korea, Republic of^1;KEPCO Research Institute, Daejeon; 305-760, Korea, Republic of^2

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] Critical temperatures;Cryogenic cooling system;Normal operations;Performance tests;Stirling cryocoolers;Sub-cooled liquid nitrogen;Target temperature;Thermal characteristics