Partenaires et organisations internationales
(Anglais)
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Imperial College (UK), Universite de Geneve (CH), Universitat Goettingen (D), Institut National Polytechnique de Grenoble (F), Universidad Complutense Madrid (E), EA Technololgy (UK), Perelli CAVI SpA (I), National Grid Company (UK), Asea Brown Boveri (CH), Solvay Barium Strontium GmbH (D), Centre National de la Recherche Scientifque (F), Schneider (F)
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Résumé des résultats (Abstract)
(Anglais)
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The objective of this project is to demonstrate an up-scaleable process for fabricating the so-called 'Second generation' conductor based on Y-123 superconductor. This class of conductor, considered as a prime desideratum for many power applications at 77K, should exhibit high engineering critical current density at 77 K and yet be based on a robust and cost effective production process.
The role of ABB is (1) to determine the I-V characteristics of HTS conductors as they are developed, (2) to contribute to the design of new conductor architecture for minimised AC losses, and (3) to assess the technical and economical benefits of the developed conductors.
In the first year, Y-123 coated conductor was evaluated, which preliminarily showed clear advantageous application potential of over Bi-2223 wires. Also this period saw the start of the build-up of the simulation tools for AC losses calculation.
In the second year, it is further concluded that (a) the final cost of Bi-2223 conductor (currently estimated at 300 USD/kAm) is still some 10 times higher than accepted by application. On the other hand, the cost of YBCO film could reach 10 USD/kAm if low cost process could be developed. This is one of the main considerations for the SUPERTEXT to focus deposition process on LPE and Spray Pyrolysis, placing the project well in line with World-wide activity on developing cost effective fabrication process for coated conductor. (b) Currently available Bi2223 based tapes and wires do not meet the technical requirement. (c) the high field tolerance (esp. for transformer) will allow a compact design and make novel design possible.
Also, test facilities for pulsed characterisation of j-E characteristics of HTS have been established (current upto 7000 A and voltage up to 1000 V with rise time <1 ms).
In the last year, a simulation tool for AC-losses for has been developed, based on the concept created during the second year. Such a tool, although still to be fine tuned, is able to simulate AC-losses of conductors with different geometries. It is believed that such a tool will allow us to establish the design rules for minimised AC-losses. It well accepted that AC-losses have to be satisfactorily resolved before any viable commercial applications of HTS become possible. Any reduction in AC-losses will reduce the cooling cost of HTS device, thus increasing its competiveness..
Finally, full assessment has been carried out both on HTS conductor development and power application (Fault current limiter and Transforms).
Worldwide activities focus on developing low cost Y-123 based coated conductor. The cost still has to be reduced by 2 order of magnitude. The project partners have made substantial contribution to Liquid Phase Epitaxy growth and Spray Pyrolysis, both processes being actively pursued as strong candidates.
Power transformer based on HTS is promising for power transmission and distribution but application faces very stringent materials requirement, e.g. low AC-losses (0.25 mW/Am @ 100 mT //), FCL functions, and low cost (10 USD/kAm).
Superconducting Fault Current Limiter will become important for power quality and interconnection of electric grids. It enables design of new power system and is particularly suited for applications with high prospective fault current. Apart from low cost (e.g. 10 USD/kAm), and low AC-losses, robust component is still to be developved for repeated high power application.
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