For both, you will need a number of protection relays. What power ratings are you talking about?
For transformers, you need to look at: Differential Overcurrent Restricted Earth fault Winding temperature Buchholz
For a turbine-generator - Earth fault - stator and rotor Overload Overcurrent Reverse power Differential Negative phase sequence Winding temperature Field failure Overspeed Vibration Lubricating oil failure Eccentricity Thrust
The best bet is to get a protection scheme supplied as part of the main equipment order.
