The big generators used on the grid that need to be synchronized are “synchronous generators”.
1) Synchronous generators will not general self-start if electricity is applied when they are stationary.
2) If a large generator is not synchronized and connected to the grid, there will be huge fluctuations in the amperage it is drawing and thus the forces (torque) inside the generator. This is likely to blow fuses or other electrical protection devices, and the fluctuating forces could conceivably cause physical damage to the generator (though I suspect the electrical protections are designed to kick in before mechanical damage would occur).
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