![]() ![]() Superconducting transformers also have some advantages over traditional iron-core transformers: they are more efficient, can include a current limiting capability, and can be designed more compactly. They have already been considered in a variety of applications requiring high power and high efficiency, such as power grids, wind power, ships, and airplanes, amongst others. Superconducting machines, such as motors and generators, are generally more efficient and compact than their conventional counterparts for the same power output. They can also be used to power large-scale instruments such as accelerators, reducing power losses and improving overall system performance. In this context, superconducting cables could replace conventional cables as a means to transmit electricity over long distances with lower losses. They have gained traction as they also present negligible losses in AC, therefore allowing for the construction of better-performing power devices that can provide uninterrupted transmission of electrical energy. High-temperature superconductors (HTS) are slowly replacing conventional conductors in specific power applications demanding high power density. ![]() Based on a case study representing a portion of the Parisian railway network, it was found that the insertion of a superconducting cable can result in a reduction of electrical losses by 60% compared to conventional cable as well as an 8.6% reduction in the total electrical consumption of the traction network. This FE model was coupled with a lumped-parameter circuit model of the railway network, which is particularly suited for transient simulations considering train motion. A commercial finite element (FE) software, COMSOL Multiphysics, was used to carry out a detailed FE model that accounts for the non-linearity of the electrical resistivity ρ ( J, B, θ) of the superconducting cable. In the present work, the electromagnetic response of two HTS cables topologies, unipolar and bipolar, was analyzed, and their impact on a direct current (DC) railway network under load was assessed. ![]() This feature is advantageous in order to transmit more electrical energy at a lesser footprint than conventional cable, therefore avoiding costly modifications of the existing infrastructures. Amongst the possible technological choices, high temperature superconductor (HTS) cables have been evaluated, since they offer greater energy density at lower electrical losses than conventional cables. These projects aim to reduce line losses and decrease voltage drops on the railway network. To tackle this challenge, the SNCF has implemented several electrification projects. The Société Nationale des Chemins de fer Français (SNCF) is facing a significant challenge to meet the growth in rail traffic while maintaining continuous service, particularly in densely populated areas such as Paris. ![]()
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