Actually, the neutral conductor (in a wye-connected system) only carries current when there is an imbalance. When the system is balanced, there is no neutral current!If that is the case how exactly does the neutral serve to carry away excess current which results from such a system?
If you've truly worked with 3 phase systems, then you'd know that you would NOT get 220V from each phase,...I donno abt most of u, but I have worked with 3 phase gensets and loads....
... we are supplied with 440VAC 3 phase 4 wire. So we can get 220VAC from each phase ...
Although the single phase currents are all handled by the neutral. That doesn't mean that they're equal to each other.So, balanced or not, load current is handled by the neutral through out all the phases here.
This might be true for mathematical proof. But as for me, I have measured line to line of 400VAC thru 440VAC here, and a line of voltage of 200VAC to 230VAC.If you've truly worked with 3 phase systems, then you'd know that you would NOT get 220V from each phase,
but rather 254V, since 254 * √3 = 440
This all may be true for u all.For instance, a typical 4-wire wye distribution in the U.S. is 208/120. That is, line-to-line voltages measure 208V,
whereas line-to-neutral voltages measure 120V. This is often used in industrial lighting. You could have several 120V lights connected from Phase A to neutral, several from Phase B to neutral and several from Phase C to neutral. It is entirely possible (and likely) that the current in this situation would not be the same on each phase, therefore there would be a current imbalance.
If you could connect appropriate loads so that each leg was drawing the same amount of current, then the system would be balanced. If you where to measure the current on each phase, you might have 30 amps each, but each of those currents is 120° out of phase from the other 2 currents and they cancel each other out. A current measurement of the neutral wire would verify this.
The same holds true for a typical (in the U.S.) 240/120 split phase system used in households. The neutral is common to both legs. If each leg draws the same amount of current, the currents on the neutral cancel each other out.
So, you're saying mathematics is incorrect?This might be true for mathematical proof.
I don't know what measuring line-to-line voltages has to do with line-to-neutral voltages.... I have measured line to line of 400VAC thru 440VAC here, and a line of voltage of 200VAC to 230VAC.
I have extensive practical knowledge. I'm an industrial electrician and have been working with, and studying 3 phase power systems nearly 30 years.Seems to me u are the one with limited practical knowledge.
So it's true for everyone but you? Seems to me you're the one having difficulty understanding!I believe what I see, and no one can convince me otherwise
This all may be true for u all.
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by Jake Hertz