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# Hz = frequency in hertz (alternating current (AC)) AC supplies are usually single-phase (1φ) except where marked three-phase (3φ). Conductors: overhead line or; conductor rail, usually a third rail to one side of the running rails. Conductor rail can be: top contact: oldest, least safe, most affected by ice, snow, rain and leaves.
The resistance of the rails used for the third phase or return is higher for AC than for DC due to "skin effect", but lower for the low frequency used than for industrial frequency. Losses are also increased, though not in the same proportion, as the impedance is largely reactive. [12] 3-phase pantograph on a Corcovado Rack Railway train in Brazil
In this system, the current is mainly carried between the overhead line and a feeder transmission line instead of the rail. The overhead line (3) and feeder (5) are on opposite phases so the voltage between them is 50 kV, while the voltage between the overhead line (3) and the running rails (4) remains at 25 kV. Periodic autotransformers (9 ...
Three-phase electric power (abbreviated 3ϕ [1]) is a common type of alternating current (AC) used in electricity generation, transmission, and distribution. [2] It is a type of polyphase system employing three wires (or four including an optional neutral return wire) and is the most common method used by electrical grids worldwide to transfer ...
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Nearly three out of 10 U.S. drugstores that were open during the previous decade had closed by 2021, new research shows. Black and Latino neighborhoods were most vulnerable to the retail pharmacy ...
When an electric motor, AC or DC, is first energized, the rotor is not moving, and a current equivalent to the stalled current will flow, reducing as the motor picks up speed and develops a back EMF to oppose the supply. AC induction motors behave as transformers with a shorted secondary until the rotor begins to move, while brushed motors ...
Candy canes are a peppermint treat long associated with Christmas. Learn their history, including why they were first made with red and white stripes.
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