Greetings,
Im looking at the output of an electronic 3-phase meter.
I have 2 snapshots from the meter.
In one snapshot I can make sense of most of the data presented.
The output gives me Va, Vb, Vc, Ia, Ib, Ic, and their angles, a single power factor, watts, VA, and VAR.
When I built my power triangle I almost agree with the outputted VA, watts, and VAR. I am within a little on some and right on it on other numbers.
For this snapshot there was load - current in all 3 phases is around 1.1A.
The meter also provides Harmonics VA and Harmonic pf I did not use these 2 numbers in my power triangle.
My next snapshot was without load.
I am given the exact same data current is around 0.1 in all 3 phases.
I cannot get any where close to the power triangle meaning using the same procedure above (Vrms)(Irms) VA, VA(cos()) = watts and so on. I do not get the outputted watts, VA and VAR. The outputted powers are quite a bit higher.
One thing that stands out is that in this snapshot (no load) my harmonics VA and harmonics pf are quite a bit larger than the loaded snapshot.
With load: harmonics VA = 25.7 and harmonics pf = 0.069.
With no load: harmonics VA = 493.965 and harmonics pf = 0.30.
Here is all of the data for the no load:
Va = 113.336, Ia = 0.087: Ia lags Va by 15.86 degrees
Vb = 112.676, Ib = 0.136: Ib leads Vb by 21 degrees
Vc = 113.512, Ic = 0.158, Ic lags Vc by 10 degrees
Watts = 710.078
VArms = 1644.563
VAtd = 1568.625
VAR = 1398.719
Pf = 0.432
Harmonics VA = 493.965
Harmonics pf = 0.3
Can you show me how to get the watts, VA rms, and VAr from the provided currents and voltages?
How do I use the provided harmonic data in power calculations?
Thanks
Sparky
