why is 220 volt considered single phase? Shouldn't it be double phase? There's 3 pahse.?

Answer 1

There are two systems:

The 3 phase system in the UK has 3 hot wires each is about 380V form another, and 220V from ground.

The 3 phase system in the U.S. has 3 hot wires each is about 210V form another, and 120V from ground.

For both systems, a single phase is a use between any one of the three hot wires and the ground wire. A double phase is a use of any two of the three hot wires. And a three phase use is a use of all three hot wires.

Answer 2

If it's 220VAC without a neutral wire it's single phase, 220VAC with a neutral wire is 2 Phase. 3 Phase 440VAC is 3 110 lines with a neutral wire. Most appliances that run 220VAC don't require a neutral, just a common ground, which is considered single phase. This is not the full technical definition, it's just what I've noticed while fixing electrical systems. Click on the link below for the technical definition.

Answer 3

This Site Might Help You.

RE:
why is 220 volt considered single phase? Shouldn't it be double phase? There's 3 pahse.?

Answer 4

rbfunk90:
The first 2 responders didn't give accurate information.
Jimmie and sciquest have given you good information.

In 3-phase current, there are 3 leads (4, if you count the neutral), each of which is 120 degrees out of phase with the other two. So as one lead's voltage is peaking (in the positive direction), the other two phases are at a negative voltage, with one increasing and the other decreasing.

"Single phase" 220 simply means that there is a single a.c. voltage that increases and decreases in sine-wave fashion. That's if you consider only the two hot leads. If you also consider the neutral lead, then you have two hot leads that are 180 degrees out of phase with each other. So as one increases, the other decreases; as one peaks with a positive voltage, the other is peaking (or valleying) with a negative voltage; and as one passes through 0 voltage, the other passes through 0, but is going in the other direction.

Arguably, this could be considered two-phase or (as you put it) double phase. But since the DIFFERENCE between the two hot leads is 220 volt single phase, it is not considered to be two phases.

Answer 5

No. This 3 phase 220 motor is probably an induction motor. It can't be run on a single phase.I suppose it could be extensive redesigned to work as a single phase motor but the stator windings would have to be rewound and the rotor most likely would have to be changed. It would be cheaper to buy a 120/240 single phase induction motor.

Answer 6

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You cannot rewire the motor but you can convert single-phase to 3-phase power using a rotary converter or an electronic inverter. A third type, the static converter, is simpler but allows you to operate your equipment at only 2/3 its rated power, so it is generally not recommended. This may be what was referred to as a "transformer", but it's not that simple - a transformer alone cannot generate 3-phase power from a single phase.

Answer 7

Double phase? That's very rare these days. Do you perhaps mean split-phase? Also known as 3-wire, single-phase, mid-point neutral?

Answer 8

the electric plant's generator,has three coils and a spinning armature which produce three phase current in three "hot" lines. house service comes from two of the"hot" lines at the pole thru a transformer with a neutral, also called the ground.the ground to any one of the "hot" lines is110 volts.between the two "hot" lines is 220volts . you're lights and most of the house use the 110. the cloths dryer,furnace a.c, cook stove,water heater etc. use the 220.( unless on gas ).technicly you could call this double phase,because its power between two "hot" lines that are one third phrase apart. three phase current is when all three generator lines are used without a ground. each "hot"line is the same voltage between it and the other two. this can be 220, 440,or 660 volts. each time you double the voltage, you cut the amperage in half.( more muscle, less expense). most manufactures use three phase for its power, and the higher voltage for the savings. single phase is voltage between only two "hot" lines ,or a "hot" line and a ground. and three phase is voltage between all three "hot" lines , called split phase,because they are one third phase apart out of the power plant. three phase is used to run large electric motors ,and easy to reverse the rotation of the motor by 0nly having to switching any two of the three lines at the motor. i think "actuator" discribed it best....

Answer 9

Go to this website to get info on phases and how they work.

two phase was used in direct current:
http://en.wikipedia.org/wiki/Polyphase_system

Answer 10

I think you are correct.