This paper analyses the current distribution in noinsulation (NI) coils in a layer-wound configuration. The investigation aims at comparing the electrical characteristic of two coils wound from the same BSCCO tape, with or without electrical insulation between turns. Both coils are characterized by a very similar geometry, with the same number of turns and layers. Both coils, cooled in liquid nitrogen bath, are charged until the tape critical current is exceeded. To interpret the measurements and analyze the current distribution within the winding, a lumped-parameter equivalent electrical circuit is developed and solved numerically in a time-varying regime. The model results are compared with the signals acquired through voltage taps soldered at the same locations in both coils. Finally, the model is applied to investigate the impact of the transverse contact resistance and to estimate the most stressed locations of the coil during charging, in terms of power produced by Joule effect.

Electrical characteristics of HTS coils with and with-out insulation in a layer-wound configuration

Andrea Musso
Primo
Membro del Collaboration Group
;
Pier Luigi Ribani
Membro del Collaboration Group
;
Marco Breschi
Ultimo
Membro del Collaboration Group
2021

Abstract

This paper analyses the current distribution in noinsulation (NI) coils in a layer-wound configuration. The investigation aims at comparing the electrical characteristic of two coils wound from the same BSCCO tape, with or without electrical insulation between turns. Both coils are characterized by a very similar geometry, with the same number of turns and layers. Both coils, cooled in liquid nitrogen bath, are charged until the tape critical current is exceeded. To interpret the measurements and analyze the current distribution within the winding, a lumped-parameter equivalent electrical circuit is developed and solved numerically in a time-varying regime. The model results are compared with the signals acquired through voltage taps soldered at the same locations in both coils. Finally, the model is applied to investigate the impact of the transverse contact resistance and to estimate the most stressed locations of the coil during charging, in terms of power produced by Joule effect.
Andrea Musso , Giuliano Angeli , Massimo Ascade, Marco Bocchi, Pier Luigi Ribani , Valerio Rossi, Angelo Valzasina, Marco Breschi
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/817001
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