How do I choose a proper approach for detecting ground fault currents (20 mA through 30A, 60Hz)? Let's say I have a zero sequence CT and calculate a burden resistor. I have a 12-bit ADC in the micro. I have seen different methods:
I want to avoid as much hardware as I can and leverage the microcontroller, even for filtering. Also, I don't think a fixed gain amplifier or burden resistor would cover this wide range of current with good resolution?
I'd appreciate your suggestions.