I want to use a PA3202NL Rogowski Coil from Pulse Electronics with ADE7858A.
Datasheet: 416 µV/A @ 50Hz.
Can this Coil be used with ADE7858A?
How do i calculate the IGAIN and other needed registers for a Rogowski coil?
The rogowski coil you show can certainly be used although there will be a few points to keep in mind.
In terms of IGAIN, that only needs to be changed if you are trying to calibrate multiple meters so that they all have the same A/Code constant on the current channel. That is done the same way as if it was a CT as long as all the settings above have been setup. The idea of calibration is that with known inputs you can calculate constants for the meter in units of V/Code, A/Code, W/Codes, Wh/Code, etc. With these, the registers can be converted to real world values. A good resource is the Application Note for calibration, http://www.analog.com/media/en/technical-documentation/application-notes/AN-1076.pdf.
Thank you for your Answer!
Do i need to calibrate xPHCAL Registers if i use rogowski coils?
The phase error is only 0.05 degree.
With a phase error of 0.05 degrees you shouldn't have to perform any phase calibration. Phase error has a larger effect when the power is at a non-unity power factor. If you want to double check, I would suggest looking at the error in your active and reactive at a PF = 0.5.
In the end, if the phase error is 0.05 degrees then you should not have any problems and shouldn't need phase calibration.
just one more question,
i see that there are new registers in 7878A that average xVRMS and xIRMS to
IARMS_LRIP and VARMS_LRIP
Can this registers be used for calibration or do i need to wait for a zero-crossing interrupt and read
xVRMS / xIRMS?
Those registers are good to use for calibration. It follows our other recommended method of reading the RMS with low ripple which is to average at least 50 readings for a 50Hz system over 1 second. This RMS_LRIP measurement is even better because it averages all 8192 readings over the second.
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