select gen set for start pumps
select gen set for start pumps
(OP)
hi,
I want to start up 3- 300 kw (272 start up current cos 0,7) motor, 1- 90 kw ( 68 A start up current, cos 0,72), 1- 450 kw ( 396 A start up current cos 0,7) and the voltage is 4160 Volts... we are thinking on starting up with direct start and a generator driven by a diesel motor.
thanks a lot
I want to start up 3- 300 kw (272 start up current cos 0,7) motor, 1- 90 kw ( 68 A start up current, cos 0,72), 1- 450 kw ( 396 A start up current cos 0,7) and the voltage is 4160 Volts... we are thinking on starting up with direct start and a generator driven by a diesel motor.
thanks a lot





RE: select gen set for start pumps
RE: select gen set for start pumps
RE: select gen set for start pumps
RE: select gen set for start pumps
RE: select gen set for start pumps
RE: select gen set for start pumps
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: select gen set for start pumps
RE: select gen set for start pumps
RE: select gen set for start pumps
If this were my project, I would run the numbers and see how the demand matches available Gen-Set sizes. The set selection may be a no-brainer. However, with soft starters, if I was close on a smaller Gen-Set, I may remind myself that the starting current is lagging the running current quite a bit and the total current is less than the sum of the parts. I may convince myself that I can go as low as 125% of total load. But, 125% of total may be more than the original rule of thumb.
When I consider the problems I have had with a lot of undersized sets (sized by others) and the problems I have not had sizing sets with my rule of thumb and the problems that were anticipated (by suppliers) but didn't materialize with over sized sets, I tend to avoid cutting corners with Gen-Sets.
If this will be prime power, seriously consider adding another 10% on top of everything. The extra 24% may make the difference between 15,000 Hrs and 30,000 Hrs or more between major engine rebuilds. You will probably calculate the hours per year of expected running and compare that figure to 15,000 Hrs and 30,000 Hrs.
Bill
--------------------
"Why not the best?"
Jimmy Carter