pf in 3-phase.

Since the load is out of balance, you would be better off getting good power quality meter and measure it.

There are both single and three phase meters available.

Unless this is a three phase motor with a real problem you can use a single phase PQM andmeasure each phase individually as this is how you appear to operating your site.

Regards,
Sapper.

Guest,

This only works if the three phase load is balanced.

The original question specifically notes that the load is unbalanced. That is being used as 3 single phase loads.

Regards,
Sapper

I have an Amprobe 3-Phase power meter that gives me a total power factor by calculating an RMS value for the three phases for both real and apparent power, then calculates the resultant phase angle. This works with unbalanced loads. I am not sure this is the CORRECT way to do it, just the way the Amprobe people seem to be doing it. I do not find the total power factor all that useful. More important is the power factor for each phase, from an analysis standpoint. Especially when dealing with unbalanced loads, one looks at each individual phase to determine the appropriate adjustment in the load balance....

The apparent power factor is the KW/KVA.

The displacement power factor is the phase shift experienced between a phase voltage and its current. In an unbalanced system, the three displacement power factors can be different. One usually average them if a single displacement power factor figure is needed.