paralleling generators

[al in wi]

im designing a parallel genset system and while researching some criterions for it, i came across this article:

http://www.csemag.com/article/17522...eling_Generators_in_Critical_Applications.php

notice the one line, there is 6 generators in parallel. The gen ratings are 1800kW at 12470V, but the genbreakers are 1200A. It should be only maximum handle rating of (2250k/(12470*1.73))*1.25 or did i miss anything.

I am designing a parallel genset system rated at 2000kW each at 480. That gives me about 3000A handle rating on the paralleling gear with a 6000A bus. Its a 2 turbine hydro, so both generators are running all the time. Is there a swgr who can make such a big gear? or bigger? if we add a 3rd turbine?

the other thought is asking for a gen output at 5kV class....but the 480V gen output is a stock design.

 

[Cold Fusion]

... The gen ratings are 1800kW at 12470V, but the genbreakers are 1200A. It should be only maximum handle rating of (2250k/(12470*1.73))*1.25 or did i miss anything. ...

15kv breakers are often rated at 1200A - it doesn't matter if the load is a 50kva station service xfm or a 1200A tie breaker. The relays are set for the circuit requirements.

... I am designing a parallel genset system rated at 2000kW each at 480. That gives me about 3000A handle rating on the paralleling gear with a 6000A bus. Its a 2 turbine hydro, so both generators are running all the time. Is there a swgr who can make such a big gear? or bigger? if we add a 3rd turbine? ...

yes

... the other thought is asking for a gen output at 5kV class....but the 480V gen output is a stock design.

or 13.8kv, or put in a transformer on each unit to increase to 4.16kv or 13.8kv. Generally one considers this if there is a long transmission to the utilization equipment. This is just a cost analysis issue. As a designer this is part of what you do.

cf