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
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