Protection System for Superconducting Magnetic Energy Storage (SMES)
A unique cryogenic system is needed to dump 106 to 107 litres of 1.8 K helium from a superconducting magnetic energy storage (SMES) unit in 5 to 20 seconds after the detection of an internal fault. The dump system includes quick-acting closures suitable for superfluid helium, refrigerated storage to receive and hold liquid helium without flashing losses, and a gas supply to maintain a positive pressure in the cryostat. The protection system transfers stored electromagnetic energy at low voltage into thermal energy absorbed by internal metallic axial structure. A rapid helium dump helps obtain more uniform final temperatures in the axial structure and conductor turns. Recommendations for specific hardware development are discussed.
KeywordsReservoir Pressure Refrigerate Storage Superfluid Helium Heat Leak Superconducting Magnetic Energy Storage
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