Hi Seung,

hope you are fine in South Korea these days??

Carefully reading the whole datasheet will give an answer to all of your questions!

So, choose R1, Rv-, Ri- and Ri+ to 470R. Cldiff, Cvdiff should be 18nF. Cv+, Cv-, Ci- and Ci+ should be 220pF.

Rshunt should be selected so that at maximum rated current about 150mVeff appears across it (V=10). So, for a maximum rated current of 20Aeff Rshunt should be 0.0075R or 7.5mOhm.
Unfortunately, heat dissipation at Rshunt is huge then, so that V=50 should be selected and Rshunt should be decreased to 0.0015R or 1.5mOhm.

The same calculation for the voltage divider R2/R1: 250Veff maximum rated voltage shall be divided down to 150mVeff (V=10). So, if R1 is 470R R2 should be about 780kOhm, which can be formed by two 390k resistors in series, for instance.

Take care, this 780k resistor must be able to withstand surge!! So, you cannot take a cheap resistor here, but it must be surge proof.

Kai Klaas