Proof, Two-Wattmeter Power Measurement (3 Phase)

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jegues

Joined Sep 13, 2010
733
See figure attached.

We are supposed to show that for a balanced three-phase power system that the sum of the readings of the two devices is indeed equal to the three-phase power.

How do I go about showing this?

Can someone give me a hint as to where to start?

I can see that Vab, and Vcb will be the line voltages, but I'm still not sure where to start.
 

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t_n_k

Joined Mar 6, 2009
5,447
Draw the phasor diagram and the approach becomes more obvious. In any case there are numerous on-line examples of the proof. Google "two watt meter method three phase power".

I have a "proof" of my own - if you are interested I'll post a copy.
 
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