We are using ADE7878 for our three phase meter and getting an accuracy error high on lower currents.
I Nominal - 1A
I max -10A
Dynamic current Range: 1%Ib to Imax
Voltage Ranges: This product supports two nominal voltages ie 240V and 63.5V.
Voltage - 240V
we do Vrms, Irms, DCoffset, active gain, Phase cal and reative gain calibartions.
The accuracy of both active and reactive is very good when tested with 240V as nominal but when we test 63.5V as nominal, only the active accuracy is good as expected but for the reactive, we are getting more error particularly on lower currents(<10%Ib).
Is that ADE7878 couldn't make enough power during lower voltages and lower currents? How active accuracy can be good but reactive not?
Snap shot of reactive accuracy results:
Verify Bal 1%In Upf
>>> -0.725 %
>>> -0.720 %
>>> -0.719 %
Verify Bal 2%In 0.5Lag
>>> -0.613 %
>>> -0.592 %
>>> -0.680 %