The severity of line-to-ground and 3-phase faults at the terminals of an unloaded star connected synchronous generator is to be same. If the terminal voltage is 1 p.u. and X1 = X2 = j0.35 p.u., Xg0 = j0.05 p.u., for the alternator, then the required inductive reactance for neutral grounding is ________.
1
Xn = j 0.1 p.u.
2
Xn = j 0.015 p.u.
3
Xn = j 0.15 p.u
4
Xn = j 0.2 p.u.
5
Xn = j 0.02 p.u.