D.G set problem

Keep them as is, load sharing at 500 amp each. This is a very efficient load range. 1000 amp on the 900 amp machine will cause generator winding temperature overheat and may cause engine overload if the engine was sized EXACTLY for 750 kVA at 0.8 PF. If engine was oversized, (example; if 750 kVA at 0.8 PF meant you needed exactly a 10 cylinder engine, and the next size was really a 12 cylinder like a Cat 3412, then you have extra engine power). If your generator was rated at 80*C temperature rise above 50*C but your real ambient is 40*C then you have some extra amp overload capacity. If you generator was rated at 130*C rise above 40*C you will not have any overload capacity in your generator.

Dear Guest, There is no need to do any change in the existing setup. Good luck. Chaterpilar