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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.
The Higashi-Shimizu Frequency Converter Station is operated by Chubu Electric Power Co. and is located at 677-3 Tanakake, Hirose-aza, Shimizu-ku, Shizuoka. It is fed via a 275 kV power line and a 154 kV power line. Its inverters operate at 125 kVDC and have a maximum transmission rate of 300 MW.
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.
Topology of blocking mode cycloconverter [1]. 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).
Frequency conversion may refer to different processes affecting frequency of physical phenomena: A frequency changer , an electronic device that converts alternating current (AC) of one frequency to alternating current of another frequency
In order to produce the proper voltage at a constant AC frequency, usually three-phase 115 VAC at 400 Hz, an alternator needs to spin at a constant specific speed (typically 6,000 RPM for air-cooled generators). [1] Since the jet engine gearbox speed varies from idle to full power, this creates the need for a constant speed drive (CSD).
Allows binary division to 100 Hz (32,768×100 Hz, or 2 15 ×100 Hz) and to 50 Hz, used in e.g. wattmeters and DC-AC converters 3.560 Amateur Radio: A common QRP frequency (80-meter band), also called 3560 kHz. Other less common crystals for the same band are 3.535, 3.550 (SKKC), 3.579 (digital modes) MHz. See also 7.025 MHz. 3.575611 PAL
For 50 Hz systems such as PAL each frame is shown twice. Since 50 is not exactly 2×24, the movie will run 50/48 = 4% faster, and the audio pitch will be 4% higher, an effect known as PAL speed-up . This is often accepted for simplicity, but more complex methods are possible that preserve the running time and pitch.
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