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DOI: 10.5445/IR/1000075558

Liquid Nitrogen operated Cooling Systems for Superconducting Power Lines

Herzog, Friedhelm; Kutz, Thomas; Stemmle, Mark; Kugel, Torsten

Abstract:
HTS power cables or high current bus bar systems can be cooled by circulating subcooled liquid nitrogen through the cryostats in which they are integrated. The heat impact which has to be removed is mainly caused by heat transfer through thermal insulations and by the circulation pumps. To minimize the required cooling energy it is necessary to optimize pressure drop and surface area of cable cryostats and operate the circulation pumps with low dissipation. The circulating liquid nitrogen is cooled in a vacuum subcooler which uses liquid nitrogen as refrigerant. Vacuum pumps allow an operation pressure of 150 mbar to achieve a vaporisation temperature of 64 K (13 K below the atmospheric boiling point of nitrogen). This is advantageous because the ampacity of superconductors is dependant on the difference between their transition- and operation temperature. Lower temperatures are not practical, because at 63 K nitrogen becomes solid. Messer has developed a cooling system with an adequate vacuum subcooler, a liquid nitrogen circulation system and a storage vessel for the German AmpaCity project of Innogy SE (formerly RWE Deutschland A ... mehr


Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Vortrag
Jahr 2017
Sprache Englisch
Identifikator URN: urn:nbn:de:swb:90-755582
KITopen ID: 1000075558
HGF-Programm 37.06.02; LK 01
Erschienen in 2nd International Workshop on Cooling Systems for HTS Applications (IWC-HTS), Karlsruhe, Germany, 13th - 15th September 2017
Bemerkung zur Veröffentlichung Author affiliation: Messer Group GmbH
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