Intermittant loads on electrical generator
Intermittant loads on electrical generator
(OP)
Can anyone give any advice regarding concerns with exposing a continuous duty diesel electric generator (about 1500 HP) to loads that fluctuate? Without building the system I can't guess at what rate the continuous loads fluctuate but every 3 minutes a 300 amp load (a batch process) kicks in. In a similar installation I saw a 480V delta x 480V delta transformer installed between generator and load to act as a buffer for the generator but the loads were fluctuating continuously and significantly (300 to 600 amps every couple seconds continously). Any merit to this?






RE: Intermittant loads on electrical generator
Throwing a transformer in the middle does not do anything to the actual load seen by the generator.
It is not clear from your post, if this is a real issue or you are anticipating something. Engage an experienced electrical engineer to look at the issue/design.
Rafiq Bulsara
http://www.srengineersct.com
RE: Intermittant loads on electrical generator
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Intermittant loads on electrical generator
RE: Intermittant loads on electrical generator
RE: Intermittant loads on electrical generator
We need a little more information.
Bill
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"Why not the best?"
Jimmy Carter
RE: Intermittant loads on electrical generator
RE: Intermittant loads on electrical generator
Assuming it is larger than 1000kW, 250 amp load fluctuations should not be an issue. I would worry more about accommodating 200 HP motor starts. You will do well to hire a professional help.
Rafiq Bulsara
http://www.srengineersct.com
RE: Intermittant loads on electrical generator
We have capable EE's on staff...just not available presently.
RE: Intermittant loads on electrical generator
The generator response to real power block loading is not the same as the response to inductive block loading.
Bill
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"Why not the best?"
Jimmy Carter
RE: Intermittant loads on electrical generator
Alan
RE: Intermittant loads on electrical generator
Thanks for your helpful comments.
RE: Intermittant loads on electrical generator
I doubt many suppliers would offer a cheap AVR on a 1 MVA set but make sure it is a 3-phase averaging type otherwise the rectifier loads of the VFDs will upset things. Are the VFDs equipped with active front ends for PF correction? Active front ends can do some really weird things if the voltage is heavily distorted, like trying force the current to follow a voltage with a triple zero crossing. Long story, but resulted in lots of smoke and some unhappy people.
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