Abstract: Disclosed is an a.c. electric railway power distribution system comprising an a.c. busbar having at least first and second a.c. busbar sections electrically isolated by a non-energized busbar. Each of a.c. busbar sections is capable of having at least one electric train electrically connected thereto as the train moves along a railway track. A first single phase a.c. power supply is operably connected to the first a.c. busbar section and a second single phase a.c. power supply is operably connected to the second a.c. busbar section. An a.c. to d.c. electronic power converter is provided having an input operably connected to the first a.c. busbar section, and having an output operably connected to a d.c. busbar. A d.c. to a.c. electronic power converter is also provided having an input operably connected to the d.c. busbar and having an output operably connected to the second a.c. busbar section.

Abstract: An electronic system comprises a three-phase transformer, a power conversion circuit, and a control circuit. The three-phase transformer has primary windings and first, second and third secondary windings. The primary windings are connected to three-phase power supply and the first secondary winding is connected in phase with a single-phase load, such as an electric railway. The second and third secondary windings are connected to the single-phase load by the power conversion circuit. The power conversion circuit includes an a.c. to d.c. converter, a d.c. to a.c. converter, and a single-phase transformer. The d.c. to a.c. converter is adapted to convert out of phase power from the second and third windings, into a d.c. voltage signal. The d.c. to a.c. converter is connected to a.c. to d.c. converter and is adapted to convert the d.c. voltage signal into a single-phase a.c. voltage signal. The single-phase transformer has a primary winding which is connected to the d.c. to a.c.