Electrical Breakdown Characteristics of Superconducting Magnet System in Sub-Cooled Liquid Nitrogen

作者: Hyoungku Kang , Chanjoo Lee , Tae Kuk Ko , Bok-Yeol Seok

DOI: 10.1109/TASC.2007.898047

关键词:

摘要: Dielectric characteristics of gaseous helium (GHe) injected into the cooling system to make sub-cooled nitrogen condition with constant pressure is found be extraordinarily weak in dielectric strength by H. Mitsuii (1998). In high voltage superconducting machines using system, current lead part GHe environment could electrical points rather than magnet liquid (LN2). order enhance part, three methods are suggested this paper. The first one enclosing leads solid material and second exposing vacuum, last topping up materials such as Glass Bubbles (GB) which usually used heat insulator. addition, extinction time bubbles caused breakdown measured determine suitable system. It that bubble LN2 drastically enhanced over 1 bar.

参考文章(5)
Erwin M. Wouterson, Freddy Y.C. Boey, Xiao Hu, Shing-Chung Wong, Specific properties and fracture toughness of syntactic foam: Effect of foam microstructures Composites Science and Technology. ,vol. 65, pp. 1840- 1850 ,(2005) , 10.1016/J.COMPSCITECH.2005.03.012
D Evans, Turn, layer and ground insulation for superconducting magnets Physica C-superconductivity and Its Applications. ,vol. 354, pp. 136- 142 ,(2001) , 10.1016/S0921-4534(01)00135-6
Hyoungku Kang, Hyung Jin Kim, Duck Kweon Bae, Min Cheol Ahn, Ho-Myung Chang, Tae Kuk Ko, Sub-cooled nitrogen cryogenic cooling system for superconducting fault current limiter by using GM-cryocooler Cryogenics. ,vol. 45, pp. 65- 69 ,(2005) , 10.1016/J.CRYOGENICS.2004.07.007