Power supply of high-speed lines in Italy by 2 AC 50/25 kV 50 Hz

Italian high-speed and high-capacity lines are supplied by 2 AC 50/25kV 50Hz. The power is fed in from the national 380kV grid through a railway-owned 150kV grid which supplies the railway substations. The substations transform the three-phase AC power into the single-phase supply of the overhead contact lines. The power supply requires control systems and auxiliary supply of the various safety-relevant components. Special attention was given to the design of the system separation sections between AC and DC lines. There, several components were installed to avoid interference between both supply systems.