This work describes the activity concerning the studies and modeling for the analysis of the operation and the possibilities of integration of superconducting cables in AC and DC electrical networks. The activities have been developed based on the following themes:

• Update of the bibliographic analysis on superconducting cables for power transport and related numerical models. The bibliographic analysis presented here is aimed at updating the knowledge on the state of the art regarding the construction, testing and numerical modeling of high critical temperature superconducting cables (HTS-SC cables) for power transport.
• Development activities for the definition of single-phase non-steady-state fluid dynamic modeling methods that allow for a simulation, in such conditions, of the thermo-fluid dynamic behavior of cryogenic fluids inside superconducting cable cryostats. These fluids are conveyed in forced convection inside the cryostats and studying their behavior is essential to evaluate the effectiveness of the superconducting cable refrigeration, and therefore the stability of its electromagnetic behavior and the reliability and safety of the cable itself installed in the network. In previous research activities, models of the thermo-fluid dynamic operation of steady-state superconducting cables have been developed. This report describes in detail methods for the extension, development and numerical solution of such models in the field of transient (non-steady) situations that could occur during the operation of the cable.
• Analysis and comparison of correlations on friction factors of cryostat ducts In particular, in this report the main correlations available on friction factors of cryogenic fluids in forced convection inside tubular ducts, annular ducts and for the configuration of a cable inside a duct (Cable in Conduit Conductors or CICC), have been selected, analyzed, implemented and compared with each other. Several numerical simulations in steady state have been performed to parametrically evaluate the impact of the value and variation of the friction factor on all the thermo-fluid-dynamic quantities of the refrigerant fluid in its flow in the duct