I tried to simulate a circuit which requires a zero sequence current transformer (zct) having N no of turns (lets say is 1000). Zct has line and neutral of power supply as primary winding and gives current differential of line and neutral. The secondary has 1000 no of turns and will step down the differential current. During normal condition, the net current at primary of zct is zero, therefore the secondary has zero current. During fault, suppose line current is 10A, and neutral current is 10.005A, the current differential is 0.005 A. The secondary of zct will step down the current by the factor of 1000 and gives 5 micro Amp.

I want to make a circuit diagram. Can anyone please help in this.