Three-Phase Industrial Power (Different from Household Single-Phase Electricity)
First, let’s understand what phase means:(phase: phase angle in physics; also refers to the coil winding in electrical systems).
From this we can see that the difference between three-phase power and household electricity is not simply “more wires”, but the difference in electrical phase angles between multiple windings.
So how does the current actually change in these windings?In a three-phase circuit, the phases are usually labeled U phase, V phase, and W phase as circuit identifiers.The electromotive force relationships are:
[*]U phase leads V phase by 120°
[*]V phase leads W phase by 120°
[*]W phase leads U phase by 120°
This repeating relationship forms the cyclic phase sequence of the electromotive force.
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