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A three-wire three-phase circuit is usually more economical than an equivalent two-wire single-phase circuit at the same line-to-ground voltage because it uses less conductor material to transmit a given amount of electrical power. [3] Three-phase power is mainly used directly to power large induction motors, other electric motors and other ...
Transposition is the periodic swapping of positions of the conductors of a transmission line, in order to reduce crosstalk and otherwise improve transmission. In telecommunications this applies to balanced pairs whilst in power transmission lines three conductors are periodically transposed.
FMC or Flex is used where EMT or other non-flexible conduit is impractical or for short runs, known as "whips", to lights or other devices. For power circuits, the color-coding uses the same colors as residential construction, and adds the additional wires used for three-phase systems.
Blue Line (Line 1 and Line 3) only North Korea: Pyongyang: Pyongyang Metro: based on fleet of cars from Beijing and Germany South Korea: Yongin: Everline: Portugal: Lisbon: Lisbon Metro: Sweden: Stockholm: Stockholm Metro: Nominal voltage 650 V, subway 3 (blue line) 750 V. Subway 1 and 2 will change in the long term to 750 V. United Kingdom ...
The amount of power that can be sent over a transmission line varies with the length of the line. The heating of short line conductors due to line losses sets a thermal limit. If too much current is drawn, conductors may sag too close to the ground, or conductors and equipment may overheat.
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The plotted line represents the variation of instantaneous voltage (or current) with respect to time. This cycle repeats with a frequency that depends on the power system. In electrical engineering, three-phase electric power systems have at least three conductors carrying alternating voltages that are offset in time by one-third of the period ...
Accenture plans to return at least $8.3 billion in cash to shareholders through buybacks and dividends in the next fiscal year. It has already returned about $6.7 billion to shareholders through ...