- Q6 An Alternator Rated At 10 Kv Protected By The Balanced Circulating Current System Has Its Neutral Grounded Through A 1 (38.71 KiB) Viewed 22 times
Q6. An Alternator rated at 10 kV protected by the balanced circulating current system has its neutral grounded through a resistance of X ohms. The protective relay is set to operate when there is an out of balance current of 1.8 amp in the pilot wires, which are connected to the secondary windings of 1000/5 ratio current transformers. (a) Determine the per cent winding which remains unprotected, (b) Find the minimum value of the Earthing resistance required to protect 75% of the winding. Suppose, X is the last non-zero digit of your student ID. [3*2]