Means of distributing alternating-current electrical power
This article is about electrical power distribution. For the signal processing concept with the same name, see Polyphase matrix.
One voltage cycle of a three-phase system
A polyphase system (the term coined by Silvanus Thompson) is a means of distributing alternating-current (AC) electrical power that utilizes more than one AC phase, which refers to the phase offset value (in degrees) between AC in multiple conducting wires; phases may also refer to the corresponding terminals and conductors, as in color codes. Polyphase systems have two or more energized electrical conductors carrying alternating currents with a defined phase between the voltage waves in each conductor. Early systems used 4 wire two-phase with a 90° phase angle,[1] but modern systems almost universally use three-phase voltage, with a phase angle of 120° (or 2π/3 radians).
Polyphase systems are particularly useful for transmitting power to electric motors which rely on alternating current to rotate. Three-phase power is used for industrial applications and for power transmission. Compared to a single-phase, two-wire system, a three-phase three-wire system transmits three times as much power for the same conductor size and voltage, using only 1.5 times as many conductors, making it twice as efficient in conductor utilization.
Systems with more than three phases are often used for rectifier and power conversion systems, and have been studied for power transmission.
^The first polyphase system: a look back at two-phase power for AC distribution, IEEE Power and Energy Magazine (Volume: 2, Issue: 2, Mar-Apr 2004) [1]
A polyphasesystem (the term coined by Silvanus Thompson) is a means of distributing alternating-current (AC) electrical power that utilizes more than...
Polyphase may refer to: Polyphase matrix, in signal processing Polyphasesystem, in electrical engineering Polyphasic sleep Polyphase quadrature filter...
him a considerable amount of money and became the cornerstone of the polyphasesystem which that company eventually marketed. Attempting to develop inventions...
Polyphase coils are electromagnetic coils connected together in a polyphasesystem such as a generator or motor. In modern systems, the number of phases...
reactive power are well defined in any system, the definition of apparent power for unbalanced polyphasesystems is considered to be one of the most controversial...
relative physical positions of the conductors of a transmission line in a Polyphasesystem. A transposition tower allows these sections to be connected together...
M270 Multiple Launch Rocket System Rotary phase converter, an electrical machine that converts power from one polyphasesystem (including frequency) to another...
ISBN 9780824729158. Retrieved 2012-09-10. Petar Miljanic, Tesla's PolyphaseSystem and Induction Motor, Serbian Journal of Electrical Engineering, pp...
of the original shown at the World's Columbian Exposition in 1893 Polyphasesystem. Showing an example of generation, transmission and utilization of...
other devices to limit the loss of service due to a failure. In a polyphasesystem, a fault may affect all phases equally, which is a "symmetric fault"...
"Electric power transmission patents; Tesla polyphasesystem". (Transmission of power; polyphasesystem; Tesla patents) Wikimedia Commons has media related...
laboratories. For polyphasesystems, multiple single-phase transformers can be used, or all phases can be connected to a single polyphase transformer. For...
currents than household plugs and sockets. They are generally used in polyphasesystems, with high currents, or when protection from environmental hazards...
Inductive coupling Load profile Magnetization Parametric transformer Polyphasesystem Power inverter Rectiformer Voltage converter With turns of the winding...
operate a device. Examples of simple radio control systems are garage door openers and keyless entry systems for vehicles, in which a small handheld radio...
energy without wires as a physical link. In a wireless power transmission system, an electrically powered transmitter device generates a time-varying electromagnetic...
abbreviated RPC, is an electrical machine that converts power from one polyphasesystem to another, converting through rotary motion. Typically, single-phase...
dipoles. polyphase coil A coil intended for connection to a polyphase power supply. polyphasesystem An alternating current power transmission system using...
systems to be synchronized, both systems must operate at the same frequency, and the phase angle between the systems must be zero (and two polyphase systems...
is also used in wireless power systems for portable computers, phones, and vehicles. Various resonant coupling systems in use or are under development...
frequency, and connector types for over 200 countries Perilex Plug load Polyphasesystem Smart plug Stage pin connector Anderson Powerpole Schroeder, Fred E...
quantity physics plasma physics plasticity pneumatics point estimation polyphasesystem power (electric) power (physics) power factor pressure probability...
interred in Switzerland. Electric motor Three-phase electric power Polyphasesystem Rigid collectors Bertram Hopkinson, his son Alfred Hopkinson and Edward...
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