Models are proposed for two major components of the coupling eddy currents,
induced in RTD-HTSC power transmission cables by a time varying transverse
magnetic field. Mie consider multi-layer, multi-tape cable designs in whic
h the winding direction alternates with each layer. By assuming unsaturated
operation in the tapes we calculate resistive losses for a wide range of p
ossible inter-tape contact resistances. Specific results are given for two
hypothetical tape models corresponding to multi-filamentary OPIT (Oxyde-Pow
der In Tube) and thin film IBAD (Ion Beam Assisted Deposition) elaboration
processes. Conclusions are made on the constraints that the results may tak
e place on the future designs: particularly, on the decision whether or not
to insulate the winding layers.