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The generic term used by the International Union of Railways for the technology is overhead line. [1] It is known variously as overhead catenary, overhead contact line (OCL), overhead contact system (OCS), overhead equipment (OHE), overhead line equipment (OLE or OHLE), overhead lines (OHL), overhead wiring (OHW), traction wire, and trolley wire.
A catenary pole of the system. Catenary wires and contact wires are tensioned by individual tension balancers. The basic system unit is an elementary electrical section consisting of a segment of one or more parallel tracks, each with a contiguous contact (or catenary or trolley) wire for the locomotive pantograph and an electrically separate feed wire.
A chain hanging from points forms a catenary. The silk on a spider's web forming multiple elastic catenaries.. In physics and geometry, a catenary (US: / ˈ k æ t ən ɛr i / KAT-ən-err-ee, UK: / k ə ˈ t iː n ər i / kə-TEE-nər-ee) is the curve that an idealized hanging chain or cable assumes under its own weight when supported only at its ends in a uniform gravitational field.
Derelict catenary along the New Haven Railroad main line in Mount Vernon, New York. The segment south of Pelham now uses a third rail. The New Haven had no precedent to follow when designing its catenary system. Overhead catenary had previously been the domain of trolleys, except for a few three-phase railways in Europe. No prior experience ...
Overhead lines or overhead wires are used to transmit electrical energy to trams, trolleybuses or trains. Overhead line is designed on the principle of one or more overhead wires situated over rail tracks. Feeder stations at regular intervals along the overhead line supply power from the high-voltage grid.
Dual electrification is a system whereby a railway line is supplied power both via overhead catenary and a third rail. This is done to enable trains that use either system of power to share the same railway line, for example in the case of mainline and suburban trains (as used at Hamburg S-Bahn between 1940 and 1955). [1]
Having to circulate on the electrified networks of different railway administrations on which there were overhead contact lines with very different geometrical and mechanical characteristics (e.g., laying height, polygonation and material of the catenary, position of the supporting brackets in relation to the contact wire, maximum force that ...
These lines are mounted on the pylons of the overhead wire over the lines. The voltages used for traction current lines are 110 kV in Germany and Austria and 66 kV or 132 kV in Switzerland. Traction current lines are operated symmetrically against earth. In the case of 110 kV lines, for example, each conductor has a voltage of 55 kV against earth.