Help with DGs

How often do the motors start? For a constant load, the generator rating looks about right, but frequent starts might be "pushing" the generator a bit hard.

Are there any known problems with the lube system to the turbo? If the generator shuts down under a highly load condition, the turbo will be spinning at its fastest, and it may coast a while after oil pressure is lost.

Well at times they may have to start even 6 times a day. The running hours span to the max of 3 to four hours on the DG.

Ya i read something similar to what you are suggesting but that would happen if the oil supply is blocked or something,no? Umm, about the load shunting, it does happen in steps because the load drops sudenly when we take a motor off load. Cant really be helped :(

Check lub oil pressure gauge. Once a faulty gauge ruined my DG set. get it calibrated.

dude, tell a little about how the DG is loaded. I mean how do you start the motors when intending to run on DG. Because the starting torque of Inductive motors is almost 2 times the normal torque, hence very high loads are dealt with in the beginning.

Actually inrush current during an across the line start can be 6 times the motors FLA. Installing a soft start is the way to go. I concur with the others who cited lube issues and improper shutdowns. Edmund

The fact is that the two motors are very close to the generators capacity. The two motors are rated for 112kva that is very close to 135 KVA. The generator cannot contain the starting current of the next motor when one is already runing. more so u may have to check the respective currents of the motor to find out if one is is not excessively higher than the other. Each of the motor is 45KW approx or 56 KVA. U may either have to increase the size of ur gen set or have a PF improvement system installed.

Dickson

regarding turbo charger failures, do u mean bearing failures or rotor failure?