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Experimental and numerical methods for the characterization of Superconducting YBCO-based tapes and components

pubblicazioni - Poster

Experimental and numerical methods for the characterization of Superconducting YBCO-based tapes and components

Questo articolo espone le attività sia sperimentali che modellistiche volte alla determinazione delle caratteristiche V(I,T) in nastri superconduttori ad alta temperatura (HTS) di seconda generazione (2G) del tipo Coated Conductors (CCs) in YBCO. Entrambe le metodologie (sperimentale e modellistica) sono impiegate per l’indagine del comportamento dei HTS-CCs in ogni condizione di funzionamento: stato superconduttivo, flux-creep, flux-flow e stato normale. Questo aspetto è particolarmente importante per la simulazione del comportamento dei dispositivi limitatori della corrente di corto-circuito a superconduttore (SFCL) durante eventi di gusto o di sovraccarico, perché, durante la fase di limitazione del dispositivo, il nastro HTS-CC attraversa tutte le condizioni di funzionamento.

First Generation (1G) BSCCO High Temperature Superconductors (HTS) tapes are suitable for many applications, but they often imply significant amount of tape. This leads engineers to choose in some cases Second Generation (2G) YBCO HTS Coated Conductors (HTS-CCs), which can reduce the tape length due to their electromagnetic characteristics. This paper reports on both experimental and modelling activities aimed to identify V(I,T) characteristics of commercial HTS-CCs. Both methodologies are applied to investigate the HTS-CCs behaviour across every typical regime: superconducting state, flux-creep, flux-flow and normal state. In order to thoroughly represent the tape behaviour, parameterized analytical formulations of V(I,T) characteristics have been assumed and then validated through fitting methodologies. Numerical calculation of the electric field as a function of the temperature and of the current density in the HTS-CCs is fundamental for the quality of models used to design devices based on HTS-CCs. In fact it allows improving the dedicated-software calculation accuracy. This is particularly important for the simulation of Superconducting Fault Current Limiters (SFCL) behaviour against short-circuits and/or overloads events, because during the SFCL limitation performance HTS-CCs pass through all the possible regimes. If quite simple in the case of high prospective currents, different regimes and their combinations play a more important role in case of overload or low short-circuit currents.

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