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Topic: Three phase

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Polyphase system

Two phase

Split phase

Electric motor

Alternating current

Induction motor

Phase shift

Electricity distribution

Power factor

Testing earth fault resistance

War of Currents

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	Integrated three phase separator - Patent 7014757
		An integrated three phase separator as set forth in claim 1 wherein said metering plate means includes a flat plate juxtaposed at an angle to an axis of said vertical separation unit and at an angle to an axis of said horizontal unit.
		An integrated three phase separator as set forth in claim 3 wherein said flat plate is juxtaposed at approximately a 30° angle to said vertical unit.
		An integrated three phase separator as set forth in claim 1 wherein said metering plate means includes a flat plate extending across a diameter of said tubular elbow connection, and having a truncated base to permit liquid flow therethrough.
	www.freepatentsonline.com /7014757.html (2629 words)

	Three Phase Electronic Circuits
		Phase Splitting: Phase splitting means the creation of a sinusoidal signal like a given one, but displaced in phase by a certain amount.
		The unit phasor exp(jωt) is said to have phase ωt in degrees or radians, where ω is the angular frequency 2πf radians per second.
		Three phase Power Supply: The "small" three phase power supply is capable of delivering 3.5 kV at 1 A. The 380 V AC is connected via a start-up circuit, limiting the initial current.
	www.discovercircuits.com /T/threephase.htm (952 words)

	A Boyce's Electrical Webpage on 3-Phase Power (Site not responding. Last check: )
		A three phase ac generator uses three armature coils and 3 sets or 6 brushes to produce three current waveforms.
		Three phase power is used extensively in industry for operating motors and machinery.
		The stator windings 1,2, and 3 are connected to the incoming power phases 1,2, and 3 respectively.
	ourworld.compuserve.com /homepages/boyce_smith/3phase.htm (561 words)

	Three-Phase Sequence Analyzer :: Blocks (SimPowerSystems)
		The Three-Phase Sequence Analyzer block outputs the magnitude and phase of the positive- (denoted by the index 1), negative- (index 2), and zero-sequence (index 0) components of a set of three balanced or unbalanced signals.
		For the first cycle of simulation the outputs are held to the values specified by the initial input parameter.
		Connect to the input the vectorized signal of the three [a b c] sinusoidal signals.
	www.mathworks.com /access/helpdesk/help/toolbox/physmod/powersys/ref/threephasesequenceanalyzer.html (495 words)

	Three-Phase Breaker :: Blocks (SimPowerSystems)
		The Three-Phase Breaker block uses three Breaker blocks connected between the inputs and the outputs of the block.
		The three individual breakers are controlled with the same signal.
		The initial status is the same for the three breakers.
	www.mathworks.com /access/helpdesk/help/toolbox/physmod/powersys/ref/threephasebreaker.html (595 words)

	Three-Phase
		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.
		Three wires are usually seen in high-voltage transmission lines, whether on towers or poles, with pin or suspension insulators.
	mysite.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)

	Amazon.com: "Phase Three": Key Phrase page
		PHASE THREE We often refer to this phase as "a new way of eating." When you reach this phase you will be...
		And by moving to the CSI Phase Three level (CSIs of 10 to 23)...
		Phase Three, or late recovery, is characterized by making further positive lifestyle changes that can prolong our lives and assist us in...
	www.amazon.com /phrase/Phase-Three (349 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)

	Three-Phase (Site not responding. Last check: )
		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.
		Three wires are usually seen in high-voltage transmission lines, whether on towers or poles, with pin or suspension insulators.
	www.du.edu /~jcalvert/tech/threeph.htm (1406 words)

	3 Phase Basics
		Three phase is nothing more than single phase with 2 extra coils slightly out of phase with first.
		With single phase the magnets and coils all line up with each other and are said to be in "phase".
		Each coil set is a "phase" of the alternator so when you measure voltage,ohms or current to test one phase of the alternator you would measure the "phase".
	www.windstuffnow.com /main/3_phase_basics.htm (815 words)

	Single Phasing and Phase Unbalance (Wisconsin Public Service Corporation) (Site not responding. Last check: )
		This condition is known as "single-phasing." The loss of a single phase on a three-phase line may be due to a downed line or a blown pole top fuse on the utility system.
		Loss of a single phase may also result from a single-phase overload condition causing one fuse to blow, or an equipment failure within the end-user's facility.
		If after the overload devices on the energized phases isolate the motor, the motor is not then isolated from the lost phase, later attempting a restart on that single-phase supply will cause the motor to draw locked rotor current.
	www.wisconsinpublicservice.com /business/phase.asp (1318 words)

	Re: three phase generator to single phase
		Three phase power is sometimes supplied to high power appliances (large electrical motor, powerful heaters, ovens etc.) directly through permanent wiring or three phase power socket (nowadays most often CEE 17/ IEC 309 socket).
		If we are talking about a three phase service (practically never seen in a home situation), the transformer is set up in a "y" configuration with 208 volts between any two secondaries and 110 between any one secondary and the centre tapped neutral.
		The building has three phases coming in, and four wires will run up to the roof (the three phases plus neutral, plus a safety ground) to run heavy equipment such as air conditioning.
	www.epanorama.net /wwwboard/messages/16475.html (1630 words)

	Phase Converters Digital - Phase Technologies Phase Perfect
		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.
		Phase Perfect is a new, patented technology that supplies three-phase power from a single-phase source to power inductive, resistive and capacitive loads with distinct advantages over any existing converter technology.
		Rotary and static phase converters intrinsically have the ability to absorb braking currents because two of the wires to the motor are connected directly to the supply system.
	www.phaseperfect.com /phasewhitepaper.htm (5438 words)

	Three-phase motors 101
		Three phase motors are also cheaper to operate.
		In single phase motors, this is solved by either using brushes to flip-flop the polarity of an electromagnetic armature (like in a DC motor) or by using a capacitor to create a shifted sine wave that can be used to 'pull' the armature in the direction we want it to go.
		It is actually what is referred to as "Split Phase" and consists of two single phase windings (with no phase shift between them) connected so that their polarities are additive.
	www.woodweb.com /knowledge_base/Threephase_motors_101.html (3151 words)

	Three-Phase
		Electrical phase is measured in degrees, with 360° corresponding to a complete cycle.
		When you connect a load to the three wires, it should be done in such a way that it does not destroy the symmetry.
		However, it is always easy to double the number of phases in a transformer secondary by making two secondary windings and connecting them in opposing phases.
	www.du.edu /%7ejcalvert/tech/threeph.htm (1406 words)

	Three phase power monitor - Patent 5337206
		A photosensor-based discharge circuit is optically coupled to the photoemitting device of the three phase integrity detector, and is electrically coupled to the hold circuit for discharging the time constant circuit thereof if a phase loss or phase imbalance is detected.
		A protective three-phase monitor is generally connected to the contactor and has probes connected to the three phases of AC power in advance of the contactor.
		In a preferred mode, the phase integrity detector circuit has a phase shift circuit for shifting one of the three phase currents by 120 degrees and this shifted phase and the other phases are fed, via an impedance network, to a hi-directional LED device.
	freepatentsonline.com /5337206.html (5873 words)

	Three-phase electricity primer
		I have a rotary phase convertor that is rated to start a 5 hp motor which is under load, and 15 hp total once each motor is started, i.e.
		Three phase motors draw higher amperages to start and when under load than when running under little or no load.
		A rotary phase converter is a good investment if you are running multiple machines or the cost of replacing a 3 phase motor with a 1 phase is prohibitive.
	www.woodweb.com /knowledge_base/Threephase_electricity_primer.html (1539 words)

	Three-Phase Transformer Circuits - Polyphase AC Circuits
		Probably the most important aspect of connecting three sets of primary and secondary windings together to form a three-phase transformer bank is attention to proper winding phasing (the dots used to denote "polarity" of windings).
		Remember the proper phase relationships between the phase windings of Δ and Y: Getting this phasing correct when the windings aren't shown in regular Y or Δ configuration can be tricky.
		Three individual transformers are to be connected together to transform power from one three-phase system to another.
	www.opamp-electronics.com /tutorials/three_phase_transformer_circuits_2_10_06.htm (753 words)

	Moon Phases :: Calendars
		Anyone with an interest in the moon or the phases of the moon -- for whatever reason -- should find some valuable information here, including a free current / daily moon phases website module, how to get a moon phases calendar software application, and other lunar phases information, including links.
		Most other moon phases calendar applications are either unwieldy, ugly, complicated, or inconvenient because you have to access a website to use it.
		The phases of the moon are caused by the relative positions of the earth, sun, and moon.
	www.calculatorcat.com /moon_phases/moon_phases.phtml (938 words)

	WoodCentral's BP Archives: Adding Three Phase Power To The Small Shop
		If three phase power is not already available, the cost of installation by the electric company could be prohibitive.
		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.
	www.woodcentral.com /bparticles/3_phase.shtml (780 words)

	Information Technology Industry Council
		If the phase conductors are loaded to rating, the neutral conductor may be loaded to 173% of the rating.
		Balancing the phase load currents in a 208Y/120 volt three phase system (making load currents equal in each phase) will normally reduce neutral current to zero if load currents have an undistorted sinusoidal wave shape.
		In three-phase building wiring systems which use three line conductors and a common neutral to provide three 120 volt line-to-neutral single phase circuits to supply lighting and small appliance motor loads, the neutral current would be less than the current in the most heavily loaded phase conductor.
	www.itic.org /archives/articles/19870601/three_phase_power_source_overloading_caused_by_small_computers_and_electronic_office_equipment.php (1471 words)

	Modeling Subsurface Transport of Petroleum Hydrocarbons--Three-Phase Distribution in a Sand Pack, US EPA
		A photomicrograph of a simulated three phase system with a blue non-wetting phase ("A"), a clear intermediate phase ("B"), and a pink ("C") wetting phase.
		The wetting phase represents water, the non-wetting phase represents air, and the intermediate phase represents fuel, a solvent or other water-immiscible liquid (creosote, crude oil, or a mixture of several).
		The full-size photograph shows that the intermediate phase (pollutant) surrounds the non-wetting phase, which is partly the reason for its thinness relative to the previous example.
	www.epa.gov /extrmurl/learn2model/part-one/phases/bthree01_phases.htm (275 words)

	Three-Phase V-I Measurement (SimPowerSystems)
		The Three-Phase V-I Measurement block is used to measure three-phase voltages and currents in a circuit.
		Inputs 1, 2, 3 and outputs 1, 2, 3 are the phase connectors of the measurement block.
		Output 4 is a vector containing the three measured phase-to-ground voltages.
	www.technion.ac.il /guides/matlab/toolbox/powersys/threephasevimeasurement.html (504 words)

	WHO \| Current WHO phase of pandemic alert
		WHO uses a series of six phases of pandemic alert as a system for informing the world of the seriousness of the threat and of the need to launch progressively more intense preparedness activities.
		Changes from one phase to another are triggered by several factors, which include the epidemiological behaviour of the disease and the characteristics of circulating viruses.
		The world is presently in phase 3: a new influenza virus subtype is causing disease in humans, but is not yet spreading efficiently and sustainably among humans.
	www.who.int /csr/disease/avian_influenza/phase/en/index.html (193 words)

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