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http://dx.doi.org/10.9714/psac.2017.19.3.049

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

Choi, Yojong (Yonsei University)
Lee, Woo Seung (JH ENGINEERING CO., LTD.)
Song, Seunghyun (Yonsei University)
Jeon, Haeryong (Yonsei University)
Kang, Hyoungku (Korea National University of Transportation)
Ko, Tae Kuk (Yonsei University)
Publication Information
Progress in Superconductivity and Cryogenics / v.19, no.3, 2017 , pp. 49-53 More about this Journal
Abstract
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.
Keywords
capacitor switching method; energy extraction; fast current decay; protection circuit; quench protection;
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