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Description
High-temperature superconductor (HTS) cables have a broad prospect in power transmission applications due to their low loss and high current capacity. The stacked-tape cable is a type of HTS cables wound with parallel-stacked tapes, which shows enhanced thermal stability due to electrical and thermal contacts between tapes. During local quench, the transport current is redistributed among stacked tapes through tape-to-tape electrical contacts and terminal joint resistances. It leads to complicated quench behaviors, which have not been studied so far. This study investigates the quench behaviors of stacked-tape cables. An electro-thermal coupled model is developed, integrating a lumped-parameter equivalent circuit model of HTS stacked-tape cables with a finite-element heat transfer module. The current redistribution and heat propagation in stacked-tape cables during local quenches are analyzed. The influences of terminal joint resistances and contact resistivities on quench behaviors and thermal stability of stacked-tape cables are studied based on the minimum quench energy (MQE). Results of this study would provide valuable insights into the stable operation of HTS cables in power transmission applications.
