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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.
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High-speed train overhead power lines: 25 kV at 50 Hz, but see the List of railway electrification systems and 25 kV at 60 Hz for exceptions. High-voltage electric power transmission lines: 110 kV and up (1.15 MV is the record; the highest active voltage is 1.10 MV [9]) Lightning: a maximum of around 150 MV. [10]
The circuit diagrams in this article follow the usual conventions in electronics; [1] lines represent conductors, filled small circles represent junctions of conductors, and open small circles represent terminals for connection to the outside world. In most cases, impedances are represented by rectangles.
Variable resistor – a protective device that has a high resistance at low voltage but momentarily switches to lower resistance on exposure to a high voltage. vector control A strategy for control of variable-speed motor drives. vector group The classification of the connections of a polyphase transformer. vehicle-to-grid
A variable-gain (VGA) or voltage-controlled amplifier (VCA) is an electronic amplifier that varies its gain depending on a control voltage (often abbreviated CV). VCAs have many applications, including audio level compression , synthesizers and amplitude modulation .
An ammeter (abbreviation of ampere meter) is an instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. For direct measurement, the ammeter is connected in series with the circuit in which the current is to be measured.
RIEDEL Communications GmbH & Co. KG (formerly Riedel Funk- und Intercomtechnik) is a German manufacturer of communications equipment and an equipment distributor. Riedel was founded in 1987 in Wuppertal, Germany by Thomas Riedel.
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