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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.
Often airplanes use 400 Hz power so a 50 Hz or 60 Hz to 400 Hz frequency converter is needed for use in the ground power unit used to power the airplane while it is on the ground. Airlines might also utilize the converters to provide in-air wall current to passengers for use with laptops and the like.
60 Hz Guernsey: G 230 V 400 V 50 Hz Guinea: C, F, K 220 V 380 V 50 Hz Guinea-Bissau: C, E, F 220 V 380 V 50 Hz Guyana: A, B, D, G 110 V 220 V [33] 190 V 60 Hz 50 Hz [33] Conversion of 50 Hz distribution to 60 Hz is ongoing. [34] Haiti: A, B 110 V 220/380 V 110/220 V 60 Hz Honduras: A, B 110 V 208 V 230 V 240 V 460 V 480 V 60 Hz
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 ...
CCVs are used for driving mine hoists, rolling mill main motors, [4] ball mills for ore processing, cement kilns, ship propulsion systems, [5] slip power recovery wound-rotor induction motors (i.e., Scherbius drives) and aircraft 400 Hz power generation. [6] The variable-frequency output of a cycloconverter can be reduced essentially to zero.
Saudi Arabia and Mexico have mixed voltage systems; in residential and light commercial buildings both countries use 127 volts, with 220 volts at 60 Hz in commercial and industrial applications. The Saudi government approved plans in August 2010 to transition the country to a totally 230/400-volt 60 Hz system. [8]
60 / 1.001 Hz ~= 59.94 Hz – NTSC video Video digital-to-analog converters operate in the megahertz range (from ~3 MHz for low quality composite video scalers in early game consoles, to 250 MHz or more for the highest-resolution VGA output).
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