The severity of line-to-ground and 3-phase faults at the terminals of an unloaded synchronous generator is to be the same. If the terminal voltage is 1 p.u. and X1 = X2 = j0.2 p.u., Xg0 = j0.05 p.u., for the alternator, then the required inductive reactance for neutral grounding is _____.
1
Xn = j0.05 p.u
2
Xn = j1 p.u
3
Xn = j0.1 p.u
4
Xn = j0.001 p.u.