Electrical Characteristics of HTS Coils With and Without Insulation in a Layer-Wound Configuration

This paper analyses the current distribution in no-insulation (NI) coils a layer-wound configuration. The investigation aims at comparing electrical characteristic of two wound from same BSCCO tape, with or without insulation between turns. Both are characterized by very similar geometry, number turns and layers. coils, cooled liquid nitrogen bath, charged until tape critical is exceeded. To interpret measurements analyze within winding, lumped-parameter equivalent circuit developed solved numerically time-varying regime. model results compared signals acquired through voltage taps soldered locations both coils. Finally, applied to investigate impact transverse contact resistance estimate most stressed coil during charging, terms power produced Joule effect.