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Unlike low temperature superconducting cables, there is so far no perfectsolution for REBCO coated conductors to form a fully transposed high currentcable. Every REBCO cable concept must import a stack of tapes to achieve anoperating current as high as tens of kiloamperes. The stacked REBCO tapes, nomatter whether they are twisted or not, however, have a nature ofnon-transposing and therefore could result in current unbalance. In thismanuscript, the current unbalance and the related electrical characteristics ofa cable made of 40 stacked REBCO tapes are studied with an electrical circuitsimulation. The differences in splice resistances and tape inductances that areboth related to the non-transposed structure of a REBCO stack are considered.Results show that for a 40 cm long termination, a proper method to keep thecontact resistivity between each tape and the copper termination around 1e-8ohmm is crucial to totally avoid current unbalance lowering the cableperformance. Surprisingly, the inter-tape current transfer is found to be ableto further exacerbate local high current though it does make the overalldistribution more balanced. The inductance difference induced current unbalanceis only important if local defects exist at long REBCO tapes, which on theother hand can be cured by good inter-tape current transfer. For afast-charging rate of 1 kA/s, the inter-tape contact resistivity should also below to a level of 1e-8 ohmm to ensure a short current transfer length of around1 m.

The current unbalance in stacked REBCO tapes -- simulations based on a circuit grid model