Single and Three-Phase AC Losses in HTS Superconducting Power Transmission Line Prototype Cables
AC losses in two, one-meter-long lengths of HTS prototype multi-strand conductors (PMC’s) are measured with a temperature-difference calorimeter. Both single-phase and three-phase losses are examined with ac currents up to 1000 A rms. The calorimeter, designed specifically for these measurements, has a precision of 1 mW. PMC #1 has two helically-wound, non-insulated layers of HTS tape (19 tapes per layer), each layer wrapped with opposite pitch. PMC #2 is identical except for insulation between the layers. The measured ac losses show no significant effect of interlayer insulation and depend on about the third power of the current -- a result in agreement with the Bean-Norris model adapted to the double-helix configuration. The three-phase losses are a factor of two higher that those exhibited by a single isolated conductor, indicating a significant interaction between phases.
KeywordsCritical Current Axial Magnetic Field Electric Power Research Institute Interlayer Insulation Conductor Spacing
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