English to Swedish Tech/Engineering Mechanics / Mech Engineering Synkronmotorer

The frequency of the generator has always to be equal or slightly above the grid one (to prevent a “return of active power” next to closing the breaker).

Vid nätsynkronisering. Return of active power..?

I meningen under står något liknande men "under excitation limitation"..

The voltage of the generator has always to be equal or better slightly above the grid voltage (to prevent an “under excitation limitation” next to closing the breaker).