EAV15107-EN06

Total power calculation for accuracy verification testing

Accuracy verification testing supplies the same test signal (total power) to both the energy reference/standard and the meter under test.

Total power is calculated as follows, where:

  • Ptot = total instantaneous power in kilowatts (kW)

  • VLN = test point line-to-neutral voltage in volts (V)

  • I = test point current in amps (A)

  • PF = power factor

The result of the calculation is rounded up to the nearest integer.

For a balanced 3–phase Wye system:

Ptot = 3 x VLN x I x PF x 1 kW/1000 W

for the kW/W conversion, would it not be simpler just to multiply by 0.001? The units are specified in the list below so the unit conversion aspect is covered already.
NOTE: A balanced 3–phase system assumes that the voltage, current and power factor values are the same for all phases.

For a single-phase system:

Ptot = VLN x I x PF x 1 kW/1000W

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