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Measurements in three-phase alternating circuits

Lecture



To measure power in a three-phase circuit with a symmetrical load, two- or three-element wattmeters are used, moreover:
to determine the active power P apply the inclusion scheme:

  Measurements in three-phase alternating circuits


to determine the reactive power Q:

  Measurements in three-phase alternating circuits

Total powers are calculated

P = 3Pf = 3UfIf cosφ, where Pf - wattmeter reading.

In the case of measuring the total power in a three-phase circuit with an unbalanced load, at least two wattmeters are used and the result is calculated by the formulas:

P = P1 + P2

  Measurements in three-phase alternating circuits ,

where P1 and P2 are wattmeter readings.

  Measurements in three-phase alternating circuits

created: 2014-09-27
updated: 2021-03-13
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Electrical Engineering, Circuit design

Terms: Electrical Engineering, Circuit design