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The concept of three phase alternating electricity refers to the relational phase differential of three alternating current single phase sine waves, each displaced 120 degrees of phase angle from the other.



still the is a three wire DC transmission system.

usually DC transmission used for several resone but the most know one is when the transmission line is longer than 600 km

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โˆ™ 2009-12-05 00:52:26
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Q: Is there such a thing as 3 phase dc voltages?
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How do you change the connection of single line to 3 phase line of DC motor?

There is no such thing as 3 phase to a DC motor. DC is direct current and is totally different from AC. 3 phase only exists in AC or Alternating Current

How do you supply power to dc 3 phase motor?

There is no such thing as a DC 3-phase motor.AnswerOn the contrary, there IS such a thing as a three-phase d.c. motor, and they are widely-used, for example, for driving water pumps (e.g. for swimming pools) supplied from solar panels. The supply to the (Hall-effect) d.c. motor is via a solid-state control system, which supplies three sequential d.c. voltages to the motor's field windings, which results in a rotating magnetic field for driving the rotor.

What are the equations to get KVA?

If using L-L voltages, the three phase power = V*I*sqrt(3)If using L-N voltages, the single phase power = V*ITo convert single phase to three phase, multiply by 3.

How are single phase and 3 phase voltages generated?

One hamster vs. three hamsters.

What is rms in 3 phase?

In three-phase systems, we always consider individualline or phase currents, or individual line or phase voltages. In other words, we treat currents and voltages no differently from single-phase currents or voltages (i.e. we don't 'combine' them because they are three-phase quantities). So these quantities are expressed in r.m.s. values.

What is the voltage of other two phase of 3 phase system when One phase is open?

If you mean 'phases' and not 'lines', then the loss of a phase has no effect on the voltages provided. You will still obtain three voltages, displaced from each other by 120 degrees.

What would be the 3 phase voltage on a frequency of 50 Hz?

Single phase and three phase voltages are not related to the frequency at which the voltage is generated. The frequency at which voltages are generated is governed by the speed of rotation of the generating device.

Can DC power be 3 phase?

No. DC does not have phase. In order to have phase, you have to have AC so that you can have two or more AC sources to measure the relative phase angles that they possess.

What is the phase to phase voltage on 600 for 3 phase?

600 volts between any two wires. The phase has nothing to do with voltages, only current relationship.

How do you calculate the resultant 3 Phase voltage when each has a different reading close to 230?

Your question is not clear.There is no such thing as a 'resultant' three-phase voltage. There are three, separate, line voltages (i.e. voltages measured between line conductors) for a delta-connected supply, which are equal in magnitude to the corresponding phase voltages. For a balanced wye-connected system, there are three line-voltages (again, measured between line conductors) which are 1.732 larger than the three phase-voltages (measured between each line conductor and the neutral conductor). For an unearthed unbalanced three-phase wye-connected load (unusual, but possible), the figure of 1.732 doesn't apply; instead the relationship must be determined by vector addition.If your question means to ask how do you determine the line voltages of a wye-connected system, given a set of unbalanced phase voltages, then you must vectorially add the relevant phase voltages to determine the relevant line voltage, taking into account the sense, or direction, of each phase voltage.

In a 3 phase full converter the output voltage during overlap is equal to?

Average value of the conducting phase voltages

Working principle of synchronus motor?

A synchronous motor is a three phase motor, which uses a magnetic field created by permanent magnets or a DC electromagnet on the rotor (usually). The stator windings have 3 phase voltages applied, and coupled with the DC field, create a rotating magnetic field that drives the motor at synchronous speed.

What are the standard voltages of 3 phase induction motor being manufactured?

For use in the U.S., the standard voltages are; 208, 230, or 460 nominal.

Can a 6 watt dc generator produce that much electricity which can be used to run a 3 phase and a 2 phase motor?

"2 phase" and "3 phase" are descriptions of AC supplies, which no DC generator can imitate, regardless of its power rating.

How do you convert 208V 3 phase to 415V 3 phase?

Voltages are converted by the use of a transformer. The two voltages 208 (North American) and 415 (UK, European) are not a standard transformer configuration. The transformer would have to be specially wound to achieve this transformation.

How do you sum 3 dc signals to get 1 output?

add the signal voltages by connecting them in series - to +

How many degrees out of phase are the voltages of a three phase system?

3 phase is 120 degrees out of phase to each other &lt;&lt;&gt;&gt; There are 120 electrical degrees separation between phases in a three phase system.

How much voltage is there in 3 phase supply?

Most buildings with a 3 phase service feed are 277/480v. That's 277 phase to ground and 480 phase to phase. This is then transformed to 120/208v.Answer for European SystemsIn Europe, the nominal low-voltage three-phase distribution systems are 400 V line-to-line (i.e. line voltages) and 230 V line-to-neutral (i.e. phase voltages).

What is the current in a single phase in 220 volt 3 phase system?

The current is based on the load amperage rating. This is true regardless of single or three phase or voltages.

Can you tap off a 3 phase 277volt ac light fixture to power a single phase 120 volt ac recptacle?

NO! The voltages available in the 3-phase system are 480 (if you wire phase to phase) and 277 (if you wire phase to neutral) Don't try it!

What is the voltage on the high leg of a three phase electrical service?

There are two aspects to consider: 1. There are several different standard voltages and connections used by the power company in three phase service. 2. Depends if the voltage is measured phase-to-phase or phase-to-ground/neutral. The three phase-to-phase (A-B, B-C, C-A) voltages should be roughly equal. In typical service, they may be 208V or 240V. The phase-to-neutral voltages are sometimes intentionally different. For example, some 3-phase service has a "high leg" that is 208 volts with respect to ground (called a 3 phase high leg delta connection), while the other two legs are 120V with respect to ground, so that you can operate 120V, 240V and 3-phase loads from the same utility service. The important thing is you should always measure before connecting equipment. 208V will fry most 120V electronics.

Why there is a phase shift of 30degree in Dyn11 3 phase transformer?

The correct term is 'angular displacement'. If you construct a phasor diagram for this transformer, you will find that the resulting secondary line voltages are displaced by 30 degrees from the primary line voltages.

What are the advantages of 3 phase over single phase?

Three phase power uses 3 conductors (or sometimes 4) for the equivalent power of 3 circuits, that in single phase would require 6 conductors. This is possible because the voltages and current are 120 electrical degrees apart in time and so sum to zero. In addition, because of the timing of the phase voltages and currents a very simple (and therefore cheap) induction motor can be run on the 3 phase supply. Single phase induction motors are more complex, less efficient, larger and more expensive. For similar reasons 3 phase transformers are more cost-effective than single phase.

How do you measure the voltages on a three phase line?

You can measure them delta (phase to phase) or star (phase to neutral). Delta voltage, in a balanced star system, is 1.732 (square root of 3) times the star voltage.By convention, when you state a three phase voltage, unless you say otherwise, voltage is the delta voltage.AnswerA three-phase, three-wire, system has three 'hot' (slang) conductors, termed 'line conductors' (not 'phase conductors' -although this term is widely, but incorrectly, used in the field). A three-phase, four-wire, system has three line conductors together with a 'neutral conductor'. Voltages measured between any pair of line conductors are called 'line voltages'; voltages measured between any line conductor and the neutral conductor are called 'phase voltages'.

What is the relationship between phase and line voltage in a 3-phase generator?

The Voltage produced by the generator will be like 3 sets of your home's voltage (assuming we're looking at an outlet and not the 220V at the brkr box).Each phase (sinusoidal wave) will be separated by 120 degrees, so when the 1st phase starts the 2nd phase will start 1/20th of a second later. The 3rd phase then starts 1/40th of a second later, and the 1st phase starts again 1/60th of a second later which is the beginning of the second set of sin waves. This of course is based on the N. American Frequency of 60 hertz which is 60 cycles (waves) per second.AnswerFor a three-phase, three-wire, system the line voltages will be identical to the phase voltages.For a three-phase, four-wire, system the line voltages will be 1.732 times the value of the phase voltages.