Unit main transformer sizing? 3

[ELEP]

If Generator is 330MVA(208.5MW),18kV. How to calculate Unit main transformer size, is it correct to use factor 1.1 or 1.2 times of Generator rating ?.

can anyone help me to know standard/reference.

Thanks in advance !

 

[bacon4life]

You could also look in IEEE C57.91 Transformer loading guide to check that the transformer will have a long enough life if this is a baseloaded unit. Running a transformer at nameplate conditions could lead to a lifetime as short as 65000 hours.

 

[ELEP]

thanks:bacon4life

Transformer loading is nicely explained in IEEE C57-91, I think it can be easily applicable for distribution transformers. Grid connected and generating transformers are always running on full load I believe, and they are desigend like that I think.