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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.
The company's products include overhead electrical line and other outdoor switchgear for voltages up to 38 kV, indoor switchgear for voltages to 15 kV, containerised electrical substations, HV DC switchgear for currents up to 12 kA with voltages up to 1.8 kV and protection relays, as well as servicing, maintenance and repair services.
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.
Overhead wires in depots; all trains are equipped with pantographs Kunming: Kunming Metro: Line 4 only Qingdao: Qingdao Metro: Shanghai: Shanghai Metro: Lines 16 and 17 only. Overhead wires in depot of Line 16, all trains on Line 16 have pantographs for depot use. Shenzhen: Shenzhen Metro: Lines 3 and 6 only. Overhead wires in depot of Line 6 ...
Lowering the current reduces the ohmic losses and allows for less bulky, lighter overhead line equipment and more spacing between traction substations, while maintaining power capacity of the system. On the other hand, the higher voltage requires larger isolation gaps, requiring some elements of infrastructure to be larger.
Electric power transmission through interconnectors using high-voltage direct-current (HVDC) involves usually two converter stations and a transmission line. Generally overhead lines are used, but an important class of HVDC projects use submarine power cables. A back-to-back station has no transmission line and joins two separate AC grids at a ...
Since 1999, the line has been modernised and the overhead line equipment has been refurbished and renewed from Mark 1 / Mark 3A to UK1 range to allow an increase line speeds from 110 mph to 125 mph (with 140 mph capability in areas previously fitted with Automatically Tensioned Mark 1 equipment - subject to upgrading of the balance weight ...
The 2 × 25 kV autotransformer system is a split-phase electric power system which supplies 25 kV power to the trains, but transmits power at 50 kV to reduce energy losses. It should not be confused with the 50 kV system. In this system, the current is mainly carried between the overhead line and a feeder transmission line instead of the rail.
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