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Topic: AC current sensing and fft (Read 324 times) previous topic - next topic


My project is to make differential protection with harmonic restraint for a 2 kva transformer so for that I have to sense primary and secondary current , I have designed cT which 1100:1 ratio , hence my 10amp current reduces to 9 ma and by providing potentiometer at output I can convert is into nearly 2 volts ......
So my question is-
How can I bias two analog input pins for both the current ......?
 And how can I perform fft for both inputs to segragate different frequency content

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