Three-phase power - Factbites

Three-phase power - Factbites
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Topic: Three-phase power

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	Three-phase electric power - Wikipedia, the free encyclopedia
		Generally three phase power either does not enter domestic houses at all, or where it does, it is split out at the main distribution board.
		This allows for 240 V three phase as well as three different single phase voltages (120 V between two of the phases and the neutral, 208 V between the third phase (known as a wild leg) and neutral and 240 V between any two phases to be made available from the same supply.
		The three phases are typically indicated by colors which vary by country.
	en.wikipedia.org /wiki/Three-phase_electric_power (1612 words)

	Three-phase electric power - Wikipedia, the free encyclopedia
		Generally three phase power either does not enter domestic houses at all, or where it does, it is split out at the main distribution board.
		Three-phase is a common method of electric power transmission.
		This allows for 240 V three phase as well as three different single phase voltages (120 V between two of the phases and the neutral, 208 V between the third phase (known as a wild leg) and neutral and 240 V between any two phases) to be made available from the same supply.
	en.wikipedia.org /wiki/Three-phase_electric_power (1863 words)

	Three-Phase
		If you are transmitting a certain amount of power single-phase, adding one more conductor operated at the same line voltage and current and using three-phase will increase the power transmitted by 72% with only a 50% increase in the amount of copper and losses.
		The power is applied steadily as in DC circuits, not in pulses as in single-phase AC circuits.
		A sinusoidal voltage is proportional to the cosine or sine of the phase.
	www.du.edu /~jcalvert/tech/threeph.htm (1406 words)

	Howstuffworks "How Power Grids Work"
		In 3-phase power, at any given moment one of the three phases is nearing a peak.
		The power plant produces three different phases of AC power simultaneously, and the three phases are offset 120 degrees from each other.
		In 1-phase and 2-phase power, there are 120 moments per second when a sine wave is crossing zero volts.
	science.howstuffworks.com /power3.htm (257 words)

	E.T.E. 3 Phase Transformer Info
		Since three phase power is the most common way in which power is produced, transmitted, an used, an understanding of how three phase transformer connections are made is essential.
		For example, if the voltage between the power conductors of any two phases of a three wire system is 208v, then the voltage from any phase conductor to ground will be 120v.
		Whenn three single phase transformers are used to make a three phase transformer bank, their primary and secondary windings are conected in a wye or delta conection.
	www.elec-toolbox.com /usefulinfo/xfmr-3ph.htm (1602 words)

	Electric power - Encyclopedia.WorldSearch
		Electric power, often known as power or electricity, involves the production and delivery of electrical energy in sufficient quantities to operate domestic appliances, office equipment, industrial machinery and provide sufficient energy for both domestic and commercial lighting, heating, cooking and industrial processes.
		With Tesla and his patents, Westinghouse built a power system for a gold mine in Telluride, Colorado in 1891, with a water driven 100 horsepower (75 kW) generator powering a 100 horsepower (75 kW) motor over a 2.5-mile (4 km) power line.
		Today, Tesla's alternating-current electric power system is still the primary means of delivering electrical energy to consumers throughout the world.
	encyclopedia.worldsearch.com /electric_power.htm (753 words)

	Re: Three Phase Power
		In almost all areas : around the world, power is generated and : distributed as a three phase suppy.
		If you use just one line of the power, then you will have 1 phase power running at 110 Volts.
		: In European countries there seems : to be mixture of single phase to house : or three phase to house.
	www.epanorama.net /wwwboard/messages/453.html (676 words)

	When is three-phase power -- the right choice?
		The power delivered to a three-phase motor is P=1.73 x V x I, where V and I are the voltage and current on any ONE phase of the motor.
		Three-phase power uses three sine waves that are separated by 120 degrees (or 1/180th of a second).
		The power company doesn't bill you for the number of amps you use; they bill for the number of kilowatthours.
	www.woodweb.com /knowledge_base/When_is_threephase_power.html (1039 words)

	single phase to three phase converter
		When using three phase power, the power is used much more efficiently than single phase because there is a higher constant potential differnce between the combination of the three phases.
		I found that the single phase input power to the converter is smaller than the three phase output power from the converter.
		Measuring AC power with some precision for either single phase or three phase(and using ordinary volt and current meters) is not easy.
	www.control.com /1026170757/index_html (681 words)

	WoodCentral's BP Archives: Adding Three Phase Power To The Small Shop
		The purpose was to provide three phase power to a jointer/planer whose smaller single phase motor was replaced by a larger three phase one.
		Also it will provide three phase power to another machine which will be delivered later.
		WoodCentral's BP Archives: Adding Three Phase Power To The Small Shop
	www.woodcentral.com /bparticles/3_phase.shtml (780 words)

	Re: Three Phase Power
		Three phase power has two main advantages: it's power does not pulsate like your typical single phase.
		The most common three phase voltages are phase of 120 and line to line of 208.
		: The most common three phase voltages are phase of 120 and line to line of 208.
	www.epanorama.net /wwwboard/messages/3699.html (459 words)

	Articles - Three-phase
		In reality such connections are generally used only when the load on the three phases is part of the same piece of equipment (for example a three-phase motor), as otherwise switching loads and slight imbalances would cause large voltage fluctuations.
		Indeed, where induction motors must run on single-phase power (such as is usually distributed in homes), the motor must contain some measure to produce a revolving field, otherwise the motor cannot generate any stand-still torque and will not start.
		Generally, in electric power systems the load is distributed as evenly as practical between the phases.
	www.masterize.com /articles/Three_phase (558 words)

	Three phase power factor controller (US4433276)
		A power control circuit for a three phase induction motor wherein power factors for the three phases are summed to provide a control signal, and this control signal is particularly filtered and then employed to control the duty cycle of each phase of input power to the motor.
		control means, including switching means connected in series with each phase input of said motor, said switching means being responsive to said control signal for varying the "on" time of each cycle of input power to a said phase input as a direct function of load on a said motor.
		first, second and third phase detection means for sampling the current and voltage in each of said three phases and providing discrete outputs wherein each is proportional to the in-phase state of one discrete phase;
	www.delphion.com /details?pn=US04433276__ (526 words)

	Three-Phase
		If you are transmitting a certain amount of power single-phase, adding one more conductor operated at the same line voltage and current and using three-phase will increase the power transmitted by 72% with only a 50% increase in the amount of copper and losses.
		The power is applied steadily as in DC circuits, not in pulses as in single-phase AC circuits.
		A sinusoidal voltage is proportional to the cosine or sine of the phase.
	www.du.edu /~jcalvert/tech/threeph.htm (1406 words)

	County To Research Three Phase Power
		Three phase line is defined by the CMP website as "a conductor installation capable of carrying heavy loads of electricity."
		He said the three phase type is much more appropriate for operating heavy industrial machinery.
		According to George Cram, of CMP, a single phase line carries 7,200 volts as opposed to the 12,470 volts carried by three phase lines.
	wiscassetnewspaper.maine.com /2000-10-05/three_phase_power.html (447 words)

	Phase-A-Matic Phase Converter, Rotary Phase Converter, Static Phase Converter and CNC Phase Converter
		Our technical expertise is derived from over 40 years of experience in phase converter systems.
		might possibly manufacture and distribute more Rotary and Static Phase Converters combined than any other manufacturer in the U.S.A., having earned a name for being of the highest quality and proven dependability, including in service, technical support and uptime that is available anywhere.
		that technical support is important for your power conversion success.
	www.phase-a-matic.com (321 words)

	Electrical Phase Supply Test Three
		(Three phase is a common method of electric powertransmission in industrialised countries.
		TPS-A Three Phase Power Supply Test Set provides an adjustable power source to test a wide variety of electrical devices...
		Three phase test set for current, voltage, power, directional, differential relays, synchronising devices, measuring transducers, energy meters etc.
	www.1st-electricalsupply.com /31/electrical-phase-supply-test-three.html (497 words)

	Phasemaster Rotary Phase Converters - The world's most reliable single to three-phase converters
		A Phasemaster rotary three phase converter is simply the most reliable, least expensive way to run your 3-phase equipment.
		Phase converters - rotary phase converters - rotary three phase converters
		A Phasemaster phase converter won't affect your power bill-and you may even pay less with the elimination of utility demand charges.
	www.kayind.com /products_application/rotary_phase.htm (328 words)

	Three-phase power systems - Chapter 10: POLYPHASE AC CIRCUITS - Volume II - AC
		The best way to get the phase shifts we're looking for is to generate it at the source: construct the AC generator (alternator) providing the power in such a way that the rotating magnetic field passes by three sets of wire windings, each set spaced 120
		Split-phase power systems achieve their high conductor efficiency and low safety risk by splitting up the total voltage into lesser parts and powering multiple loads at those lesser voltages, while drawing currents at levels typical of a full-voltage system.
		Since the voltage sources are all at different phase angles (in this case, three different phase angles), this is a "polyphase" circuit.
	www.allaboutcircuits.com /vol_2/chpt_10/2.html (1682 words)

	Using Vectors to Approximate the Neutral Current in a Three Phase Power System
		for three phase 60 hertz systems with unity power factor and resistive loads
		The geometric addition of vectors gives a fast approximation of neutral current in a three phase system.
		The sines and cosines are known for the three angles, 0 degrees, 120 degrees, and 240 degrees.
	www.electrician.com /electa1/electa4htm.htm (265 words)

	Reference.com/Encyclopedia/Electric power
		Then, in a deal with General Electric, which Edison had been forced to sell, Westinghouse's company went on to construct a power station at the Niagara Falls, with three 5,000 horsepower (3.7 MW) Tesla generators supplying electricity to an aluminium smelter at Niagara and the town of Buffalo 22 miles (35 km) away.
		Electric power, often known as power or electricity, involves the production and delivery of electrical energy in sufficient quantities to operate domestic appliances, office equipment, industrial machinery and provide sufficient energy for both domestic and commercial lighting, heating, cooking and industrial processes.
		Today, Tesla's alternating-current electric power system is still the primary means of delivering electrical energy to consumers throughout the world.
	www.reference.com /browse/wiki/Electric_power (767 words)

	Phase Converters, Power Conditioners, Marine Converters, Wind Power Converters
		Phase converters have historically been employed where utility three-phase power was unavailable, or where the electricity demand did not justify the cost of utility three-phase installation.
		VFDs were not originally designed to function as phase converters, in fact most VFDs are powered from a three phase source.
		Power to generate the voltage for the third lead flows into the digital phase converter through an inductor and a set of semiconductor switches which feed a DC (constant voltage) link capacitor.
	www.phaseperfect.com /phasewhitepaper.htm (5441 words)

	Three-phase - Wikipedia, the free encyclopedia
		In electrical engineering, three-phase electric power systems have at least three conductors carrying voltage waveforms that are 2π/3 radians (120°,1/3 of a cycle) offset in time.
		In reality such connections are generally used only when the load on the three phases is part of the same piece of equipment (for example a three-phase motor), as otherwise switching loads and slight imbalances would cause large voltage fluctuations.
		Generally, in electric power systems the load is distributed as evenly as practical between the phases.
	en.wikipedia.org /wiki/Three_phase (696 words)

	How Things Work - Electric Power Distribution
		The natural sequencing of the three phases is particularly useful for devices that perform rhythmic tasks.
		Each power wire is at 120 volts AC with respect to the neutral wire, meaning that its electric potential fluctuates up and down with respect to the neutral wire and behaves as though, on average, it were 120 volts away from the potential of the neutral wire.
		The effect of this transformer is to transfer power from the current in the primary coil of the transformer to the current in the secondary coil of the transformer.
	rabi.phys.virginia.edu /HTW/electric_power_distribution.html (12130 words)

	Nuclear Power Phase-out Think piece @ NaturalResearch.org (Natural Research)
		Opponents of nuclear power argue that it is not possible to discriminate between civil and military usage, and therefore that nuclear power contributes to the proliferation of nuclear weapons.
		The initiative "stop the construction of nuclear power stations," which proposed a ten-year moratorium on the construction of new nuclear power plants, was passed with 54.5% to 45.5%.
		On the other hand, "reactor-grade" plutonium as routinely produced in all commercial nuclear power reactors, and which may be separated by reprocessing the spent fuel from them, is not the same thing at all.
	www.naturalresearch.org /encyclopedia/Nuclear_power_phase-out (6620 words)

	Basic Electricity - Wikibooks, collection of open-content textbooks
		The generation of AC electric power is commonly three phase, in which the waveforms of three supply conduits are offset from one another by 120°.
		When distributing three-phase electric power, a fourth or neutral cable is run in the street distribution to provide a complete circuit to each house.
		Shaded-pole synchronous motors are a class of AC motor that uses single phase electric power to convert electric power to mechanical energy.
	en.wikibooks.org /wiki/Basic_Electricity (3018 words)

	Power Meter. 101A ONE AND THREE PHASE POWER ANALYZER.
		A load connection box is available which connects your single- or three phase load to the Power Analyzer and to the wall power outlet.
		Displays values of each phase, total values, or values of all three phases.
		INFRATEK AG 101A Power Meter Analyzer is suitable for measurements on electronically switched loads.
	www.hotektech.com /Infratek101A.htm (287 words)

	Single phase to three phase conversion (3 phase converters)
		For three phase converters: E-mail by clicking including delivery location so we can use an appropriate currency and estimate transport costs, power required in kW or HP and state if you need to derive single phase from one of the 3 phases and neutral, e.g.
		Single to 3 phase converters (misnamed 3 phase transformers) provide three phase power from a single phase supply.
		Unlike 'static' phase converters, they are not limited to driving a single motor, nor do they limit the motor's torque or have a lower limit to output power.
	www.isomatic.co.uk /3phConverter.htm (2355 words)

	Baldor Motor Sales - Baldor Motors: single and three phase Baldor electric motors
		The motors are available in single phase and three phase with ratings, in stock, from 1/4 HP through 300 HP.
		All three phase motors are Inverter Ready per NEMA Standard MG1, Part 31.4.4.2.
		Baldor’s pump line of motors includes single or three phase square flange motors, jet pump motors, close-coupled pump motors, and P-Base vertical solid shaft pump motors.
	www.electricmotorsale.com /baldor-ac.html (1554 words)

	EUROTHERM's - Economical three-phase power switching
		Due to the reduced component complexity, the TC2001 provides space-efficient power control for three-phase loads, plus switching only two phases reduces by 33% the power dissipated by the thyristors.
		The individual power switching elements can also be used as power switching control for two independent single-phase loads if required.
		The TC2001 provides a compact, two-phase thyristor power switch for electrical heating applications from 100 to 690 volts, 60 to 1650 amps.
	www.ferret.com.au /articles/c3/0c0218c3.asp (642 words)

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Topic: Three-phase power

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