AC Three-Phase Neutral Current

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A three-phase AC power transmission, when balanced, requires zero neutral current. By adjusting the magnitude of one phase or the phase displacement of a phase, you can observe the resulting neutral current.

Contributed by: Harley H. Hartman (March 2011)
Open content licensed under CC BY-NC-SA



Three-phase power transmission depends on a 120° phase relationship between each of the phases, as well as relatively even current magnitudes in each phase. You can adjust the magnitude of one of the phases by ±20% in order to observe the resulting neutral current. The Demonstration also allows you to adjust the phase relationship of one phase to illustrate the resulting neutral current if a single phase had a different power factor.

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