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Topic: Three phase power

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Three phase

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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.
		Where the stepdown is 3 phase, the output of this transformer is usually star connected with the standard mains voltage (120 V in North America and 230 V in Europe) being the phase-neutral voltage.
		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 (1612 words)

	E.T.E. 3 Phase Transformer Info
		Three phase transformers are used throughout industry to change values of three phase voltage and current.
		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.
		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 (Site not responding. Last check: 2007-10-08)
		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)

	ipedia.com: Three-phase electric power Article (Site not responding. Last check: 2007-10-08)
		Three phase is a common method of electric power transmission in industrialised countries.
		The power transmission grid is organised so that each phase carries the same magnitude of current out of the power station; the currents returning from the customers' premises to the power station all share the neutral wire, but the three-phase system ensures that the sum of the returning currents is approximately zero.
		All three phases are typically used in large industrial motors as this is the most efficient way to transmit large amounts of electrical power.
	www.ipedia.com /three_phase_electric_power.html (646 words)

	Howstuffworks "How Power Grids Work"
		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.
		In 3-phase power, at any given moment one of the three phases is nearing a peak.
	science.howstuffworks.com /power3.htm (257 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.
		Phase converters are rated by the maximum hp of the largest machine they will provide power for.
		Power up the converter by flipping the lever of the quick disconnect to “on”, the converter powers up is less than two seconds.
	www.woodcentral.com /bparticles/3_phase.shtml (780 words)

	single phase to three phase converter
		I found that the single phase input power to the converter is smaller than the three phase output power from the converter.
		At the input, power factor is almost unity, however at the output, power factor is that of the motor, which is not higher than 0,9 usually/depending on the rating of the motor.
		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.
	www.control.com /1026170757/index_html (681 words)

	Three-Phase (Site not responding. Last check: 2007-10-08)
		A sinusoidal voltage is proportional to the cosine or sine of the phase.
		The blue and red vectors differ in phase by 30°, and in magnitude by a factor of √3, as is marked in the diagram.
		The power is applied steadily as in DC circuits, not in pulses as in single-phase AC circuits.
	www.du.edu /~jcalvert/tech/threeph.htm (1406 words)

	Three Phase Power, Converters and Generators
		While most three phase generators consume fuels that produce exhaust and are costly to operate, single to three phase rotary phase converters are efficient and run very clean.
		Often rotary phase converters are a far less costly method to set up and continue to operate when you need to produce three phase power.
		Fuel power generators are preferred where single phase power is not readily available and sometimes when the three phase power need is exceptionally large.
	www.threephaseconverter.com /power.html (262 words)

	Articles - Three-phase (Site not responding. Last check: 2007-10-08)
		Generally, in electric power systems the load is distributed as evenly as practical between the phases.
		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.
	www.masterize.com /articles/Three_phase (558 words)

	When is three-phase power -- the right choice?
		Three-phase power uses three sine waves that are separated by 120 degrees (or 1/180th of a second).
		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.
		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)

	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."
		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.
		He said the three phase type is much more appropriate for operating heavy industrial machinery.
	wiscassetnewspaper.maine.com /2000-10-05/three_phase_power.html (447 words)

	Three-phase power systems - Chapter 10: POLYPHASE AC CIRCUITS - Volume II - AC (Site not responding. Last check: 2007-10-08)
		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.
		This principle, applied to power systems, can be put to use to make power systems with even greater conductor efficiencies and lower shock hazard than with split-phase.
		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
	www.allaboutcircuits.com /vol_2/chpt_10/2.html (1682 words)

	Re: Three Phase Power
		The biggest thing to remember is that you aren't comparing the 2 line voltage to zero, you are comparing the 2 line voltage to the difference between the remaining voltage.
		Also when you combine 2 lines, you have a 60 degree phase shift each way between the signals so you end up with a signal that is exactly 180 degrees out of phase from the remaining signal.
		In almost all areas : around the world, power is generated and : distributed as a three phase suppy.
	www.epanorama.net /wwwboard/messages/453.html (676 words)

	Re: Three Phase Power
		The square root of 3 is derived from a phasor triange.
		The most common three phase voltages are phase of 120 and line to line of 208.
		Three phase power has two main advantages: it's power does not pulsate like your typical single phase.
	www.epanorama.net /wwwboard/messages/3699.html (459 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.
		A Phasemaster rotary phase converter is engineered and built as a single, self-contained unit--not an erector set of capacitor panels, idler motors, and other components.
		Our conservative ratings mean that our 10 HP phase converter will start and run your 10 HP load-you won't need a 20 HP phase converter to do the job right.
	www.kayind.com /products_application/rotary_phase.htm (328 words)

	Phase-A-Matic Phase Converter, Rotary Phase Converter, Static Phase Converter and CNC Phase Converter
		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.
		Our technical support team is dedicated to assist you with every aspect of your converting needs from choosing the right converter to any help you may need in the proper installation and operation of the converter on your machine.
		Our technical expertise is derived from over 40 years of experience in phase converter systems.
	www.phase-a-matic.com (321 words)

	Three phase power factor controller (US4433276) (Site not responding. Last check: 2007-10-08)
		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.
		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;
		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.
	www.delphion.com /details?pn=US04433276__ (526 words)

	Using Vectors to Approximate the Neutral Current in a Three Phase Power System (Site not responding. Last check: 2007-10-08)
		This can be a long mathematical problem, but by restricting our calculation to A phase at 0 degrees, B phase at 120 degrees, and C phase at 240 degrees the calculation is simplified.
		For three vectors the magnitude calculation is similar to that for two vectors.
		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)

	RiS, Rochester ACE 2000 three-phase power analyzer
		The ACE 2000 is an advanced single- and three-phase power analyzer featuring energy, harmonic, transient, and flicker analysis capabilities.
		The instrument's dual processor architecture allows for high-measurement accuracy even on distorted waveforms, along with a powerful data management capability in the form of real-time displays and monitoring of all measurements.
		For power measurements, harmonics are compared to set threshold levels in order to detect out-of-limit values.
	omnicontrols.com /lists/RiSACE2000_three_phase_power_analyser.html (1064 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.
		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.
		If no power rating is shown then multiply the welding current by 50 for E series converters or by 30 for D series converters.
	www.isomatic.co.uk /3phConverter.htm (2355 words)

	Electrical Phase Supply Test Three
		Three phase test set for current, voltage, power, directional, differential relays, synchronising devices, measuring transducers, energy meters etc.
		A three phase test, g59 testing range of optional dsm200, dsm600 auxiliary supply modules are...
		(Three phase is a common method of electric powertransmission in industrialised countries.
	www.1st-electricalsupply.com /31/electrical-phase-supply-test-three.html (497 words)

	Fault current and arc flash hazard analysis. (Site not responding. Last check: 2007-10-08)
		The short circuit calculator presented on this web-site is offered in effort to satisfy the need for a convenient, comprehensive method of calculating three phase distribution system short circuit fault currents.
		The calculator procedure is based on MVA method for solving industrial power system short circuits.
		The components can be a power source, transformers, bus ducts, cables, motors and generators, or "special" components whereby the user can define his own X and R values for a non-standard device.
	www.arcadvisor.com (726 words)

	Boost's range of phase converters will supply a number and variety of loads at full performance.
		Boost's range of phase converters will supply a number and variety of loads at full performance.
		Boost's range of phase converters (also spelt three phase converters or misnamed 3 phase transformers) will supply a number and variety of loads at full performance.
		With the static converters there are no parts that are liable to be disturbed during transit or overheat during use, whilst the rotary converters are supplied with high quality auxiliary motors.
	www.boost-energy.com (243 words)

	Howstuffworks "How Power Grids Work"
		In almost all cases, the power plant consists of a spinning electrical generator.
		Something has to spin that generator -- it might be a water wheel in a hydroelectric dam, a large diesel engine or a gas turbine.
		To understand 3-phase AC power, it is helpful to understand single-phase power first.
	www.howstuffworks.com /power1.htm (165 words)

	EUROTHERM's - Economical three-phase power switching
		The individual power switching elements can also be used as power switching control for two independent single-phase loads if required.
		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 shorter cycle times possible with the TC2001 allows power to be delivered exactly as it is needed to maintain a constant temperature.
	www.ferret.com.au /articles/c3/0c0218c3.asp (642 words)

	Power Conditioner - Three Phase Power Conditioners
		These three phase power conditioner units protect equipment from voltage sags and spikes, switching transients, lightning, and induced surges by a carefully designed surge suppression circuit linked to a shielded isolation transformer and input and output filters.
		These power conditioner units hold output voltage regulation to a maximum of ±5%, even with an input voltage window of +15% to -25%.
		The power conditioner units operate with 150 dB Common Mode noise attenuation and 65 dB Normal Mode noise attenuation at 100 kHz.
	www.solaheviduty.com /products/powerconditioning/solatron_plus.htm (505 words)

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