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The original 1977 converter was one of the first thyristor-based HVDC schemes to be put into operation in the world and used oil-insulated, oil-cooled outdoor thyristor valves supplied by Hitachi (60 Hz end) and Toshiba (50 Hz end). A special workshop was provided on the site, in which valve maintenance (for example replacing failed thyristors ...
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.
One of the disadvantages of 16.7 Hz locomotives as compared to 50 Hz or 60 Hz locomotives is the heavier transformer required to reduce the overhead line voltage to that used by the motors and their speed control gear. Low frequency transformers need to have heavier magnetic cores and larger windings for the same
Converted in 1978 from Pennsylvania Railroad 11 kV 25 Hz system to the 12.5 kV 25 Hz on the Rahway-Matawan ROW and 12.5 kV 60 Hz electrification extended to Long Branch in 1988. The Matawan-Long Branch voltage converted from 12.5 kV 60 Hz system to the 25 kV 60 Hz in 2002. New Haven to Boston: Northeast Corridor (NEC), Amtrak
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.
50 Hz Guam: A, B 110 V 190 V 60 Hz Guatemala: A, B 120 V 208 V 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 [32] 190 V 60 Hz 50 Hz [32] Conversion of 50 Hz distribution to 60 Hz is ongoing. [33] Haiti: A, B 110 V 220/380 V 110/220 V
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