Ricerc@Sapienza

The paper describes and analyzes the electrical system of a long tunnel placed along the 'Naples-Bari' High-Speed railway line. In particular, a critical situation, due to a blackout event has been investigated. A generator set must guarantee the service continuity to supply safety and signaling system, emergency lighting and auxiliary equipment of electrical substations. A shunt reactor has been installed to compensate the reactive power produced by the long feeding cable and to respect the capability curve of the generator.

The paper reports an analysis of emergency power supply, by a generator set, for safety systems installed in long railway tunnels. The generator set guarantees the service continuity, during a blackout event, to supply signaling systems, telecommunications, emergency lighting and auxiliary equipment for electrical substations, including the relative cooling systems. The main issues analyzed were the flowing of reactive power due to the cables length used and the transient energization during the start-up phase.