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Station Service Transformer

Station Service Transformer

Station Service Transformer

(OP)
It is difficult to calculate the needed size of a station service transformer because actual loads vary and can be smaller than the rated size. There is also diversity of loads, since not all loads are on at the same time.  The total load for the station is 179.3kVA.  The power winding is rated for 100kVA.  Does this mean I need a second station service transformer?  Maybe, but again the entire load would not be on at the same time.  I cannot find an applicable NEC or IEEE code for this.  If I cannot, it will be difficult to justify the additional expense under my current project.  Any ideas...

RE: Station Service Transformer

Code does not know your loads or the process. Someone familiar with the facility operations should know which loads will be running simultaneously. That should be used to determine your demand and the transformer size.



 

Rafiq Bulsara
http://www.srengineersct.com

RE: Station Service Transformer

What is a size of station?
From where you are feed this station transformer?
What is a type of load?
What part of load is critical for station?

This part of Q's , what you need ask for decide something

Best Regards.
Slava

RE: Station Service Transformer

You need to distinguish between connected load and demand load.  The NEC feeder sizing rules may help some - see Article 220 - you are allowed to take credit if not all loads will operate simultaneously.

Connected load is almost always greater than the peak demand load, sometimes much greater.  

You might take a look at the IEEE Red Book and/or Grey Book from some help with load calculations.  

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