Cooling Unit for the 500 kV Saturated Iron Core Fault Current Limiter

The high temperature superconducting dc bias winding of the single-phase 500 kV saturated iron core is designed to be cooled with liquid nitrogen down to a temperature of 72 K. To achieve this temperature level, the coolant has to be vaporized below atmospheric pressure. An open cryogenic system was...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2019-08, Vol.29 (5), p.1-5
Main Authors: Li, Chao, Zhang, Pingxiang, Wang, Dayou, Song, Meng, Ma, Tao, Ma, Peng, Ge, Zhengfu
Format: Article
Language:English
Subjects:
Bias
Bismuth strontium calcium copper oxide
Coils (windings)
Conduction heating
Cooling
Cryogenic cooling
Cryogenic equipment
Current limiters
Enthalpy
Heat
Heat loss
Heat transfer
High temperature
Insulation
Iron
Liquid nitrogen
Nitrogen
saturated iron core fault current limiter
subcooled liquid nitrogen
Superconducting magnets
Vacuum pumps
Winding
Windings
Yttrium barium copper oxide
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Summary:The high temperature superconducting dc bias winding of the single-phase 500 kV saturated iron core is designed to be cooled with liquid nitrogen down to a temperature of 72 K. To achieve this temperature level, the coolant has to be vaporized below atmospheric pressure. An open cryogenic system was designed and fabricated, which composed of a cryostat, heat insulation pipelines, a liquid nitrogen tank, a control circuit, and a vacuum pump. Since the dc bias winding is composed of two YBCO windings and one Bi-2223 coil, three pairs of current leads are assembled on the cryostat. A control system is used to maintain the liquid nitrogen level and the operation temperature by regulating the pumping rate. According to the testing results, the steady-state heat loss including the cryostat, the conduction heat loss of current lead is about 135 W, and the total heat loss including the Joule heat loss is about 187 W at 77 K.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2019.2897714