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Three-phase power at balanced load

Lecture



Active power balanced three-phase receiver:

Three-phase power at balanced load

Reactive:

Three-phase power at balanced load

It is more convenient to express power through linear Il and Il.

With a symmetrical load, the phase powers are the same, therefore:

P = 3Pф = 3UфIфcosφф

Q = 3Qф = 3UфIфsinφф

S = 3Sf = 3UfIf
Three-phase power at balanced load

then

Three-phase power at balanced load

Conclusion: with a symmetrical load, the power formulas are the same regardless of the connection scheme of the receivers.

created: 2014-09-27
updated: 2024-05-07
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Electrical Engineering, Circuit design

Terms: Electrical Engineering, Circuit design