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Synchronous Generator Ratings

by sandy.bridge
Tags: generator, ratings, synchronous
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sandy.bridge
#1
Dec1-13, 07:02 PM
P: 778
Hey all,

If we are given a synchronous generator with the following nameplate values 10MVA, 13.8kV, 2 pole, 60 Hz

why is it not sufficient to go
[tex]S_{RATED}=I_{RATED}V_{RATED}[/tex]

as we did for transformers?

My reason for asking is because I am trying to determine the voltage regulation of a particular generator. However, if I determine the full load current using the above formula, I get an absurd result.
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dlgoff
#2
Dec1-13, 08:56 PM
Sci Advisor
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P: 2,732
Is the generator a 3 phase machine? If so, the apparent power = √3 Voltageline ⋅ Currentline.
13.8kv is a line voltage.
sandy.bridge
#3
Dec1-13, 09:09 PM
P: 778
How silly of me. Honestly, this entire time my issue was that I did not divide S by three. Thanks!


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