Energy extraction system using dual-capacitor switching for quench protection of HTS magnet

Yojong Choi, Woo Seung Lee, Seunghyun Song, Haeryong Jeon, Hyoungku Kang, Tae Kuk Ko

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The superconducting magnets have a large inductance as well as high operating current. Therefore, mega-joule scale energy can be stored in the magnet. The energy stored in the magnet is sufficient to damage the magnet when a quench occurs. Quench heater and dump resistor can be used to protect the magnet. However, using quench heater to create quench resistors through heat transfer can be slower than instantly switching resistors. Also, electrical short, overheating and breakdown can occur due to quench heater. Moreover, the number of dump resistor should be limited to avoid large terminal voltage. Therefore, in this paper, we propose a quench protection method for extracting the energy stored in a magnet by charging and discharging energy through a capacitor switching without increasing resistance. The simulation results show that the proposed system has a faster current decay within the allowable voltage level.

Original languageEnglish
Pages (from-to)49-53
Number of pages5
JournalProgress in Superconductivity and Cryogenics (PSAC)
Issue number3
Publication statusPublished - 2017 Sept

Bibliographical note

Publisher Copyright:
© 2017, Korea Institute of Applied Superconductivity and Cryogenics. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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