Home » English riddles » Protection » Protection Riddle No.60 -Role of resistor in high impedance REF » Reply To: Protection Riddle No.60 -Role of resistor in high impedance REF Reply To: Protection Riddle No.60 -Role of resistor in high impedance REF 2021-08-03 at 11:08 am #3172 Hamid CT ratio = 600/1=600 Ie = 0.01 A n = 4 ( 3 ph+1 N ) 250 = 600 x ( Is + 0.04) Is= 0.37666