i got a rough idea for i.
so, fuel gets cut;
1. prime mover starts to slow due to no fuel
2. AVR senses loss of voltage
3. boosts excitation to keep voltage steady
4. prime mover keeps slowing down
5. AVR can't keep voltage high enough as prime mover is now too slow
6. CB opens due to (i think) undervoltage trip)
7. all the load jumps onto the other generator
8. preferential trips starting opening cutting power to non essential services
9. either this sheds the load enough until that generator can handle it, or if not that generator will start to slow under the load, and trip, causing a black out.
but for ii. i got no idea. asking friends n stuff but yeah, finding a decent ship based source is proving hard.
with loss of excitation, the rotor will still be spinning at its normal RPM. what happens to the stator? is it now drawing power from the grid?