you can use a ADE7754 IC or ADE7758 IC.
These Integrated Circuits provide a full measurement of power signals.
The CT with one of these components make a powerful kit.
I have made it for my Thesis.
The Rshunt can be a trimpot(200ohm aproximmetly). It`s useful for fine adjustments.
Now, the ICs given below is for measuring , so any way u will need a coorect CT and resistance across it or other current sensing element (like hall effect sensor).