My query relates to a theoretical problem felt practically many times. We have got 3 (three) 10MVA single phase transformers (leave the ratio for now) in one of our generating stations. Together they are connected to a bus and work as a three (3) phase transformer of capacity 30MVA.

Now my question is I have got one 3 - phase 50MVA transformer in one of our sub-stations; if I wish to draw or make three (3) single phase transformers out of it shall I need to divide 50MVA by 3 ?? i.e; whether each single phase transformer would be of capacity 1/3 X 50MVA???

thanks.

ashutoshb [at] engineer.com

 

Ashutosh Bhattacharjee... the answer is a simple yes!

Regards, Phil Corso

 

Dear Ashutosh,

Yes, you are right, if you want to "replace" a 3 phase 50 MVA transformer by 3 Single Phase transformers, you have to have 50/3 MVA for each Single Phase transformer.Of course it is not practically possible to "make" 3 single phase transformers out of a three phase transformer for obvious reasons.

Thanks.

 

thanks!!