Power and energy

Three-phase power calculator

Calculate balanced three-phase active, reactive and apparent power from line voltage, line current and power factor.

Calculate

Measured line values
V
A
Enter the magnitude from 0 to 1.

Worked example

Active power, total three-phase

 kW

Reactive power, total (inductive, lagging)
 kvar
Apparent power, total
 kVA
Phase angle

Balanced three-phase, from line-to-line voltage and line current.

Underlined figures are rounded. Select one to copy its full value.

Method and assumptions

Formula

S = √3 × VLL × IL; P = S × PF; Q = ±S × √(1 − PF²)

Balanced sinusoidal system. Use per-phase measurements for an unbalanced load.

Limits of this result

  • Confirm the source data, device datasheet and installation conditions before relying on the result.

Technical sources

  1. Calculation of electrical powers in Schneider Electric PMDsSchneider Electric · 7EN52-0464-00, 2022-03-18
  2. Electrical devices — electrotechnical formulasABB · 1SDC010001D0202

Put the value to work

Read the related engineering guidance, or carry this task into System Builder to identify the signal path and EpiSensor products.

Continue in System Builder Read: Intelligent Energy Management Systems

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