Improvement of transient stability of non-insulated AC multi-strand superconducting cables

For A.C. application, superconducting strands are bundled and twisted to make a cable with large current capacity, The quench characteristic of the cable depends on the contact thermal and electrical conductivities between strands, significantly. For improvement of the stability of non-insulated multi strand cables, it is necessary to decrease the local rise of temperature by the Joule heating in the current redistribution among strands, For this purpose, we have analytically investigated non-insulated strand cables in which the surface of each strand is covered with Cu-sheath, The transient stability of this cable is discussed analytically and experimentally.