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The waveform of 230 V and 50 Hz compared with 120 V and 60 Hz. The utility frequency, (power) line frequency (American English) or mains frequency (British English) is the nominal frequency of the oscillations of alternating current (AC) in a wide area synchronous grid transmitted from a power station to the end-user.
Frequency and voltage supplied to most premises by country ... Conversion of 50 Hz distribution to 60 Hz is ongoing. ... 50 Hz Type I was the main standard until the ...
The voltage and frequency of electric power differs between regions. In much of the world, a voltage (nominally) of 230 volts and frequency of 50 Hz is used. In North America, the most common combination is 120 V and a frequency of 60 Hz. Other combinations exist, for example, 230 V at 60 Hz.
Aircraft often use 400 Hz power internally, so 50 Hz or 60 Hz to 400 Hz frequency conversion is needed for use in the ground power unit used to power the airplane while it is on the ground. Conversely, internal 400 Hz internal power may be converted to 50 Hz or 60 Hz for convenience power outlets available to passengers during flight.
The centralized system is supplied by special power plants that generate 110 kV (or 132 kV in the Swiss system) AC at 16.7 Hz and by rotary converters or AC/AC converters that are supplied from the national power grid (e.g. 110 kV, 50 Hz), they convert it to 55-0-55 kV (or 66-0-66 kV) AC at 16.7 Hz.
In countries where 60 Hz is the normal grid power frequency, 25 kV at 60 Hz is used for the railway electrification. In Canada on the Deux-Montagnes line of the Montreal Metropolitan transportation Agency. In Japan on the Tokaido, Sanyo and Kyushu Shinkansen lines (using 1,435 mm or 4 ft 8 + 1 ⁄ 2 in gauge). In South Korea on the Korail network.
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