# Total power measurement in 3-phase unbalanced delta system

I have a 3-phase system with an unbalanced delta load, as seen in the figure below.

I want to measure the total apparent and active power consumption and if possible, the respective power consumption for each of the phases, but I am a bit confused.

I am using a 3-phase equipment from National Instruments which shows that Vc = 380V, Vb = 380V and Vc = 0V. I assume that because of the absent neutral, it uses phase A as a reference, thus Vc = Vca, Vb = Vba.

I am also measuring all three line currents.

What is the total apparent power equation? I am aware of Blondel's Theorem, but it is valid only when measuring instant power right?

Also, is it possible to measure the power of each separate phase?

• You cannot measure power without a wattmeter. End of story. Commented Sep 22, 2016 at 22:25
• You can do it without a wattmeter, it just takes more steps to do it (voltage, current, $\cos\phi$, harmonics, ...), that's why a wattmeter exists, to spare you the hassle. Commented Apr 25, 2018 at 7:30