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A cycloconverter (CCV) or a cycloinverter converts a constant amplitude, constant frequency AC waveform to another AC waveform of a lower frequency by synthesizing the output waveform from segments of the AC supply without an intermediate DC link (Dorf 1993, pp. 2241–2243 and Lander 1993, p. 181). There are two main types of CCVs, circulating ...
In March 2015 a contract worth $4,656,321 was awarded to STV Incorporated, for the provision of architectural and engineering services for the rehabilitation of static frequency converters at Wayne Junction, with services to be performed over a period of 60 months scheduled to commence in April 2015 (per Proposal No. 14-233-JHC).
This replaced much of the electrical frequency conversion equipment, but the lineside transmission and distribution equipment were unchanged. In 2003, Amtrak commenced a capital improvement plan that involved planned replacement of much of the lineside network, including 138/12 kV transformers , circuit breakers , and catenary wire.
Apparatus intended to convert electric power to another form of electric power, such as conversion between AC and DC or changing frequency or phase number. power distribution That portion of an electrical grid between the substation or bulk supply and the end consumer. power electronics
A cycloconverter constructs an output, variable-frequency, approximately sinusoid waveform by switching segments of the input waveform to the output; there is no intermediate DC link. With switching elements such as SCRs, the output frequency must be lower than the input.
The tap converter is a variation on the cycloconverter, invented in 1981 by New York City electrical engineer Melvin Sandler and significantly functionally enhanced in 1982 through 1984 by graduate students Mariusz Wrzesniewski, Bruce David Wilner, and Eddie Fung.
A cycloconverter is also a type of frequency changer. Unlike a VFD, which is an indirect frequency changer since it uses an AC-DC stage and then a DC-AC stage, a cycloconverter is a direct frequency changer because it uses no intermediate stages. Another application is in the aerospace and airline industries. Often airplanes use 400 Hz power so ...
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.