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Cooling systems for HTS transformers : impact of cost, overload, and fault current performance expectations

Staines, Mike; Asrami, Mohammad Yazdani; Glasson, Neil; Allpress, Nathan; Jolliffe, Liam; Pardo, Enric


In a future commercial marketplace HTS transformers will compete with oil-immersed copper transformers - highly developed, efficient and reliable. Although HTS can offer reduced weight, lower load losses, and perhaps current limiting capability, to have any chance of commercial competitiveness the total cost of ownership (TCO) taking into account purchase price, installation and lifetime operating costs, must be lower than the conventional alternative. In addition the HTS transformer in operation must meet regulatory and network operator expectations not easy to satisfy with high current density HTS wire and cryogenic operation. The cooling system for e.g. a 40 MVA 3-phase HTS transformer needs to provide for a total thermal load at 66 K of around 3 kW, dominated by current lead and AC loss. The TCO perspective shows that one of the commercially available cryocoolers options is clearly best for closed-circuit cooling systems in this application. A 3-phase vacuum-insulated glass-epoxy composite cryostat for an HTS transformer with warm iron core is perhaps the single most expensive component of the cryogenic system. A hybrid cryostat, with vacuum insulation around the cores and foam insulation around the transformer tank can provide adequate thermal performance at a fraction of the cost. ... mehr

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DOI: 10.5445/IR/1000075561
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Vortrag
Publikationsjahr 2017
Sprache Englisch
Identifikator urn:nbn:de:swb:90-755619
KITopen-ID: 1000075561
HGF-Programm 37.06.02 (POF III, LK 01) New Power Network Technology
Veranstaltung 2nd International Workshop on Cooling Systems for HTS Applications (IWC-HTS), Karlsruhe, Germany, 13th - 15th September 2017
Bemerkung zur Veröffentlichung Author affiliation: Robinson Research Institute, New Zealand
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