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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.
HVDC converters can take several different forms. Early HVDC systems, built until the 1930s, were effectively rotary converters and used electromechanical conversion with motor-generator sets connected in series on the DC side and in parallel on the AC side. However, all HVDC systems built since the 1940s have used electronic (static) converters.
The main advantage of the solution is the ability to control the bulk power flow in the line while actively processing only a small fraction of the bulk power. The partial power processing leads to increased system efficiency and use of derated components. The use of derated components results in small and cost-efficient designs.
Additionally, technical power systems pay special attention to the way the distribution system is grounded. A risk of using a balanced power system in an installation that also uses "conventional" power in the same rooms is that a user may inadvertently interconnect the power systems together via an intermediate system of audio or video ...
The FACTs family initially grew out of the development of High-Voltage Direct-Current (HVDC) conversion and transmission, which used Power Electronics to convert AC to DC to enable large, controllable power transfers. [1] While HVDC focused on conversion to DC, FACTs devices used the developed technology to control power and voltage on the AC ...
Since one or more power conversion steps are eliminated, this increases efficiency and run time. Many systems used in telecommunications use an extra-low voltage "common battery" 48 V DC power, because it has less restrictive safety regulations, such as being installed in conduit and junction boxes. DC has typically been the dominant power ...
Seville Tram equipped with CAF ACR ground-level power supply, 2019. Ground-level power supply, also known as surface current collection or, in French, alimentation par le sol ("feeding via the ground"), is a concept and group of technologies that enable electric vehicles to collect electric power at ground level instead of the more common overhead lines.
Amtrak’s 60 Hz traction power system operates along the Northeast Corridor between New Haven, Connecticut, [note 1] and Boston, Massachusetts. This system was built by Amtrak in the late 1990s and supplies locomotives with power from an overhead catenary system at 25 kV alternating current with at 60 Hz, the standard frequency in North America.