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theses.hal.science

Strengthening electric rail traction is a major lever for reducing greenhouse gas emissions in the transport sector. Although the basic design of electric traction substations has changed little over the past five decades, their components have steadily improved. To maintain this progress, the adoption of high temperature superconducting devices is a promising option, offering high current densities, compactness, and low electrical losses. Within the framework of the SuperRail project, this thesis investigates the feasibility of a superconducting DC traction substation.Four research directions were pursued. First, double racetrack REBCO superconducting coils were designed, manufactured, and characterized, showing robustness and suitability for transformer applications. Second, three prototypes of partially superconducting transformers were developed, combining a copper primary winding operating at room temperature with a REBCO secondary winding cooled by liquid nitrogen. The final prototype, rated at the kVA scale, demonstrated stable and reproducible performance. Third, this transformer was connected with a cryogenic diode rectifier and superconducting cables to form a kW scale superconducting DC traction substation prototype. Experimental tests confirmed the operational feasibility of the concept. Finally, a techno-economic analysis was conducted to determine the conditions under which a superconducting DC traction substation could become economically competitive with conventional technology.The main contributions of this thesis are: (i) the experimental development of partially superconducting transformers, (ii) the coupled operation of a superconducting transformer and a cryogenic rectifier, (iii) the first demonstration of the superconducting DC traction substation concept, and (iv) a life-cycle cost analysis incorporating technological uncertainties.

journals.openedition.org

Ce Dossier s’attache aux humanités numériques et au sens en lien avec des corpus textuels. Les Échanges prolongent la discussion sur la narratologie et en ouvrent une nouvelle sur les valeurs. Les...

wikidata.org

pandemic caused by SARS-CoV-2 (2019–2023)

jusst.org

CHECK UGC CARE GROUP – II, DIRECT LINK Multidisciplinary Journal ISSN: 1007-6735 Fast Publication Process Response time: Within 24 hours 100% Online Availability Global Open Access Availability Double Blind Review SUBMIT PAPER About Journal Jusst Journal (Journal of University of Shanghai for Science and Technology) is a Monthly Peer Reviewed Multidisciplinary Journal. JUSST Journal is An […]

ijmsc.org

IJMSC Insights offers a closer look at the latest research and the people behind it from the community of the International Journal of Multiple Sclerosis Care (IJMSC) and the Consortium of Multiple Sclerosis Centers (CMSC).

journal.pulmonology.ru

научный рецензируемый медицинский журнал "журнал"

revistacientificaesmic.com

estudios militares y estratégicos