Ground-level power supply circuit, especially for a tramway

1. A ground-level power supply circuit for a transport vehicle comprising:

first and second mutually parallel vehicle running ways, each first and second running way including a power supply track, each power supply track including a series of conducting track segments separated by insulated joints;

a power supply line connectable to terminals of a power supply source, the power supply line being common to the power supply tracks; and

switching devices for independently and selectively connecting each power supply track segment to the common power supply line.

2. The power supply circuit according to claim 1 , wherein the common power supply line is arranged between the two power supply tracks.

3. The power supply circuit according to claim 1 , wherein the common power supply line includes a power supply cable and a current return cable.

4. The power supply circuit according to claim 3 , wherein the power supply cable and the current return cable each include electric cables encased in a sleeve.

5. The power supply circuit according to claim 1 , wherein the switching devices include a plurality of switches having two inputs and one output, each switch being located adjacent to one of the insulated joints of a track and being connected to a conducting segment of the track.

6. The power supply circuit according to claim 5 , wherein the insulated joints of the two tracks are located adjacently along the power supply line, and the switches located adjacent to the insulated joints of the two tracks are integrated into a connection assembly.

7. The power supply circuit according to claim 1 , wherein the switching devices include an assembly of switching modules, the switching modules each including two, two input-one output switches and being located only adjacent to one insulated joint out of two along a track, and each switching module being connected to the two conducting segments of the same supply track that are adjacent to that insulated joint.

8. The power supply circuit according to claim 7 , wherein the insulated joints of the two tracks are located adjacently along the power supply line, and the switching modules located adjacent to the insulated joints of the two tracks are integrated into a connection assembly.

9. The power supply circuit according to claim 1 , further comprising a power supply source permanently connected to the power supply line.

10. The power supply circuit according to claim 1 , wherein the transport vehicle is a tramway vehicle.