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Maybe you are isolating the generator bus from the rest of the system when you trip a line (or transformer?) at fault clearing? Or you are splitting the system into two separate systems?

Maybe you are isolating the generator bus from the rest of the system when you trip a line (or transformer?) at fault clearing? Or you are splitting the system into two separate systems?

EDIT: Maybe you are not doing anything wrong. It is a small test system and it might be that all generators are accelerating similarly for some fault locations and synchronism is maintained even for long fault clearing times. Plot the speed deviation for all generators and see if they are following each other.