Design of a 3 phase round rotor turbo-alternator to satisfy the following specs: 150MW(real power), Y connected, 12.6kV (terminal voltage), 60Hz, 4 pole 0.85 lagging, 250m/s peripheral speed for 20 over speed run, directly cooled stator(water) and rotor(hydrogen), Vfmax = 500V, 60 slots, 14/15 pitch, skew 1 slot, 12 parallel circuits and 25 degree C, working temperature.-Design of a 3 phase round rotor turbo-alternator to satisfy the following specs: 150MW(real power), Y connected, 12.6kV (terminal voltage), 60Hz, 4 pole 0.85 lagging, 250m/s peripheral speed for 20　over speed run, directly cooled stator(water) and rotor(hydrogen), Vfmax = 500V, 60 slots, 14/15 pitch, skew 1 slot, 12 parallel circuits and 25 degree C, working temperature.