Re: Current Sensing
I think, this has been discussed in the forum many times before. I assume you have a one turn primary winding, then the number of secondary turns sets the current ratio, you can define it to your needs. Commercial sensors as shown above give an idea of possible dimensioning. The secondary winding has to be terminated with a low ohmic resistor.
The sum of load resistor and winding resistance in relation to secondary inductance defines the lower cutoff frequency fg = R/(6.28 • L). Also, the core has a maximum voltage integral per turn. Above this value (could be calculated as a maximum secondary voltage for a given operating frequency) the core gets saturated and the measurement distorted.