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Transformers do not change the frequency of electricity; in many regions with 100–120 V, electricity is supplied at 60 Hz, and 210–240 V regions tend to use 50 Hz. This may affect operation of devices which depend on mains frequency (some audio turntables and mains-only electric clocks, etc., although modern equipment is less likely to ...
50 Hz Type I was the main standard until the 1990s, and still appears in old installations. Uzbekistan: C, E, F 220 V 380 V 50 Hz Vanuatu: C, G, I AS/NZS 3112 230 V 400 V 50 Hz Venezuela: A, B 120 V 208 V 240 V 115/220 V 220/440 V 230/460 V [76] 60 Hz Vietnam: A, B, C, F TCVN 6188-1 220 V 380 V 50 Hz
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 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.
1.1 Three-phase 50 Hz. 1.2 Voltage conversion schedule. ... Table 5 is systematically different, as the highest voltage for equipment is the characteristic value ...
Some lines in the United States have been electrified at 12.5 kV 60 Hz or converted from 11 kV 25 Hz to 12.5 kV 60 Hz. Use of 60 Hz allows direct supply from the 60 Hz utility grid yet does not require the larger wire clearance for 25 kV 60 Hz or require dual-voltage capability for trains also operating on 11 kV 25 Hz lines. Examples are:
The windings are arranged such that the currents are at the same frequency but with the peaks and troughs of their wave forms offset to provide three complementary currents with a phase separation of one-third cycle (120° or 2π ⁄ 3 radians). The generator frequency is typically 50 or 60 Hz, depending on the country.