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The AC loss in ReBCO coated conductors is large in situations when theconductors are subjected to a considerable magnetic field, like in rotatingmachines, transformers and high-field magnets. Roebel cables can reduce the ACloss in these cases. However, computer simulations are needed to interpret theexperiments, understand the loss mechanisms, reduce the AC loss by optimisingthe Roebel cable and design the cryogenic system. In this article, we simulateand discuss the AC loss due to an applied magnetic field making an arbitraryangle with the cable and taking into account a realistic anisotropic fielddependence of the critical current density. We study the AC loss in thesuperconductor parts for the limits of very high coupling currents andcompletely uncoupled strands. The simulations for the uncoupled case alsodescribe a double pancake coil with no transport current. For the simulations,we use two different numerical methods with complementary strengths. Thisserves as a mutual check of the correctness of the simulation results, whichagree to each other. Opposite than expected, we found that the AC loss does notonly depend on the perpendicular component of the applied magnetic field. Wealso found that the AC loss for applied fields with an orientation below 7degrees with the strands surface is reduced more than one order of magnitudecomparing to an untransposed cable. Therefore, we recommend to use Roebelcables for windings with important parallel components of the magnetic field,such as transformers and high-field magnets.

Angular dependenceof the magnetisation AC loss: coated conductors, Roebel cables and double pancake coils