A cylindrical rotor synchronous generator is operating at a terminal voltage of 1 pu with an internal emf of (1 + j0.5) pu. It has a steady state synchronous reactance of 0.8 pu and sub transient reactance of 0.2 pu.
If there is a three-phase solid short circuit fault at the terminal of the generator, which of the following is/are true?
1
Fault current is 2.5 pu
2
Magnitude of sub transient internal emf is 1.12 pu
3
Fault current is 0.625 pu
4
Magnitude of sub transient internal emf is 2.45 pu