I would have said there are 6 pushes per revolution for 3Φ vs 2 pushes for singleΦ....
The advantage of 3-phase over single-phase power is generally for rotating magnetic devices, like motors. Instead of two "pushes" per rotation, as with single-phase, there are 3 "pushes" with 3-phase...
I would have said there are 6 pushes per revolution for 3Φ vs 2 pushes for singleΦ.
The ripple voltage of rectified 3-phase is also much lower that rectified single phase so it's better when you need a large amount of DC power from the mains. This is also one of the reasons that automobile alternators are all 3-phase.
In the three phase, the Phase 1 wire is at its peak of 'pushing' which wire would be at its peak 'pulling'?
In a 3-phase connection there is no one wire "pulling". It's a combination of the other two wires based upon the relative voltage between the three sets of wires.In the three phase, the Phase 1 wire is at its peak of 'pushing' which wire would be at its peak 'pulling'?
Two components 180 degrees out of phase is not two-phase power. The power to the home is from a standard center-tapped transformer output. Any center-tapped transformer output gives two components 180 degrees apart when referenced to the center-tap. No weirdness there.Single phase 240/120 VAC residential in the US does have two components 180 degrees out of phase relative to a common terminal. For 2 phase to be useful, you would have to remove the common terminal which you cannot do. The power company feed is single phase. The center tapped transformer does the wierdness.
I totally agree with what you said. Clarification welcomed. I've seen people mistakingly try to refer to the 240/120 system as two phase because of the out of phase "components" with the center tap as the reference. The main point I'm trying to make is that the power company provides a high voltage single phase feed, but you get two 180 degree out of phase 120 lines with respect to neutral/ground.
It always starts an argument when someone wants to redefine a word differently from the normal accepted definition. So here goes:I'll say this with great trepidation, because I've seen this subject raised elsewhere and it's resulted in huge arguments.
Technically speaking, ordinary household power is 2-phase power. It has to be: there is one set of conductors (left high side & neutral) that is 180° out of phase with the other set (right high side & neutral). If that isn't the very definition of two phases, I don't know what is, and furthermore, I'll eat my hat (as they used to say). Doesn't matter that the two phases are trivially derived from a center-tapped transformer.
Now, traditionally, this is never referred to as 2-phase power. No electrician in their right mind would ever call this 2-phase power. And they'd give you funny looks down at the electric company if you used that term.
What is called two-phase power is that extremely weird version, now practically obsolete, where there's a second phase that's 90° out of phase with the other one. Very strange, not very useful, and most people have never heard of it. (It was mentioned here earlier, I believe.)
But all our household power does have two separate and distinct phases, even though nobody refers to it that way. So I won't argue the point further.
A split phase electricity distribution system is a 3-wire single-phase distribution system, commonly used in North America for single-family residential and light commercial (up to about 100 kVA) applications. It is the AC equivalent of the original Edison 3-wire direct current system. Its primary advantage is that it saves conductor material over a single ended single phase system while only requiring single phase on the supply side of the distribution transformer.[1] Since there are two live conductors in the system, it is sometimes incorrectly referred to as "two-phase". The two live or "hot" conductors waveforms are offset by a half-cycle, or 180 degrees offset, when measured against the neutral wire. To avoid confusion with split-phase motor start applications, it is appropriate to call this power distribution system a 3-wire, single-phase, mid-point neutral system.
In the three phase, the Phase 1 wire is at its peak of 'pushing' which wire would be at its peak 'pulling'?
It always starts an argument when someone wants to redefine a word differently from the normal accepted definition. So here goes:
Technically speaking, that is not correct. If you can find me any technical paper that describes the single-phase power coming into the house as 2-phase, I will eat my hat. You can call the two waveforms 180 degrees out of phase 2-phase, if you like (everyone is welcome to their own opinion), but that is not an accepted definition of 2-phase power. Technically, inverting the phase of a signal does not make it a 2-phase signal.
2-phase power, traditionally or otherwise, always means two waveforms 90 degrees out-of-phase. The reason is, that it provides a rotating field for motors. It wasn't just used in obsolete power system, it was also used in mechanical servo systems used before solid-state control was invented.
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