Impact of impressed current unbalance on n-index

Three subsize NbTi cable-in-conduit conductors have been tested in SULTAN test facility. The conductors are identical in the cable layout but they are different in transverse resistance: either SnAg strand coating without wraps, or Ni strand coating without wraps or Ni strand coating with the stainless steel wrapping of the last but one cable stage. Variation of initial current unbalance at the termination is provided by the demountable conductor termination. The effect of the transverse resistance on ability to redistribute the artificially unbalanced current (variation of the V-I characteristics and their n-index) has been investigated for various extents of the current unbalance: either 100%, or 75% or 50% of the strands are connected to the termination.