In order to calibrate my ADE7758 for using Rogowski Coil, I designed a test card to simulate the signal provides by the Rogowski Coil (so I am trying to calibrate the ADE for using Rogowski Coil but without Rogowski Coil)
The ADE7758 is integrated on a wattmeter and it is currently working for Current Transformers instead of Rogowski Coils.
If I am right, the Rogowski Coils induce these properties :
- The output voltage corresponds to the derivate of image of the current you want to calculate
- A shift phase of +90°
- A gain of +20dB/decade
So to simulate those properties I set a derivator between my current generator and my current inputs to derivate my signal (see the attachement)
Moreover the derivator is doing the shift phase of 90° right ? Cause if I derivate the input signal which is a sinus, I get cosinus ?
About the values, I randomly choose to simulate a calculation of a 2000A conductor. The datasheet of the Rogowski Coil I will use says 109,2mV/1000A so for 2000A the output voltage should be about 220mV
I set my resistor at 1kOhm, so my current input should be : i = v / r = 0,220 / 1000 = 0,22mA
And then I want a gain of +20dB which corresponds to 20log(10), so I want RCw = 10 : C = 10 / (r * 2 * pi * f) = 10 / (1000 * 2 * pi * 50) = 33µF
So this is the way I see things but I am not sure about it, I hope this is clear, if anyone can confirm that it is good, or otherwise tell me that it is not, I am here to discuss..