Is it possible to measure power of a 3-phase delta connected system with 2-wattmeter method under Unbalanced conditions ?

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Bhupendra Desai

No, not possible, with unbalanced load...

Biswajit Debnath

Sir, can you please provide me with some references so that I can cite them.

Measurement and Instrumentation book on Golding & Widee...

Sir, I have gone through the book by Golding & Widee where it is mentioned that 2-Wattmeter method CAN be used for power measurement in both balanced and unbalanced cases in 3-phase circuits.

With unbalance power factor???

It mentions that only the total power can be calculated for unbalanced load. Power factor can be calculated for balanced loads only.

W=VlCos(phi), hence at constant voltage, unbalanced could be considered for Cos(phi) or l or both.,,

Jerry Decker

In my experience each phase and branch was measured separately with an AC Handheld Clamp On Power Meter up to 600 volts. For high voltage the answer is probably no because the meters would be hard wired during power down, and two are not enough for all phases and branches.