Transformer rate ? 2

[ahmadnece]

if we have 3 generators 400v ,2MVA each and we step up using 3 transformers 400/22kv ,2Mva each
can we use 2 step down transformer each 4 MVA if i have maximum load =8MVA or we use 3 or 4 transformers with 2MV.
1-MY question exactly can i design step down transformer its rate is bigger than the rate of the generator or the step up transformer .
2-what is the factors that the rat eof the transformer depend on it ?

thanks

 

[wbd]

I don't understand what you are asking for with the step down transformers. Are you asking about what the end user should install or are you asking for size on station service transformers at the generating station?

 

[waross]

I think the answer to your first question is yes, within reason. However, 2 points, the maximum output will of course be limited by the input, and as the rating of the transformer increases, so will the inrush currents.
yours

 

[khadisa]

Whether step up or step down, a transformer is just a medium for power transfer at a desired voltage level. The input power does not matter but you should not overload the transformer. When you use a transformer of high rating to supply a small load you will have no problem but that of under utilisation.