Abstract
Recently diesel engines for generators have become compact by applying a high-super charging system, and generators have also become small by applying a cylindrical type rotor.So, momentary speed variations of the diesel generator system has been increased because of high super-charging of the engine and small GD2 of the generator rotor. And the generator system whose engine has a little margin to the system output can not sometimes satisfy the rule requirement about the momentary speed variation in case of a loading condition being 0→50%→400%.And so there are some cases that generator engines are obliged to have larger capacity for required output to the generator in order to satisfy the requirement of the speed variation and it causes a price increase for the generator system.But after our research through some simulations, we have come to the conclusion that the capacity increase of the diesel engine can be avoided without any problems, if an appropriate protection device is provided.
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