Two-stage cryocooling design for hybrid superconducting fault current limiter

Ho Myung Chang, Gyong Hyon Lee, Jungwook Sim, Kwon Bae Park, Il Sung Oh, Jung Bin Song, Haigun Lee

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


New concept of two-stage cryogenic cooling system for full-scale hybrid superconducting fault current limiter (SFCL) is proposed and designed with an objective to significantly reduce the capital and operational costs. Even though we have developed and successfully tested a cryocooling system for 300 A level, it is not easy to scale up the same technology to 3φ/22.9 kV/2.5 kA level, mainly because of the heavy cost of GM or Stirling cycle coolers to cover the increased thermal load. It is proposed in this study to employ a large capacity of JT cooler for heat intercept at an intermediate location of current leads. The JT coolers with mixed refrigerant are very reliable and commercially available at an inexpensive price. Detailed cryogenic design of cryostat and heat intercept components is carried out in consideration of thermal characteristics of cryocoolers and electrical insulation. It may be concluded that the two-stage cooling with a JT cooler at 130 K and a GM cooler at 77 K is feasible in practice, and can significantly reduce the capital cost and power consumption.

Original languageEnglish
Article number5422883
Pages (from-to)2047-2050
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2010 Jun


  • Cooling
  • Cryogenics
  • Fault current limiters
  • High-temperature superconductors

ASJC Scopus subject areas

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


Dive into the research topics of 'Two-stage cryocooling design for hybrid superconducting fault current limiter'. Together they form a unique fingerprint.

Cite this