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I am confused with the above problem. If I connect all 3 windings additively, I will get 3V1/3V2. But, I don't think there will be any change in kVA rating. It should still remain Q. The answer given in my workbook is option A. Please help me with this problem.

EDIT: It is not a homework problem. I am preparing for an exam called GATE(Graduate Aptitude Test in Engg). It is a previously asked problem in the exam.

  • \$\begingroup\$ What was explained in your lecture / notes / handouts? \$\endgroup\$ – Solar Mike Jan 20 '18 at 10:04
  • \$\begingroup\$ No, it was not taught in the class. I came across this problem while practising. \$\endgroup\$ – Nikhil Kashyap Jan 20 '18 at 10:10
  • \$\begingroup\$ So check the text book - as you mention it is an aptitude test... \$\endgroup\$ – Solar Mike Jan 20 '18 at 10:19
  • \$\begingroup\$ Only answers are mentioned not any solution or explanation \$\endgroup\$ – Nikhil Kashyap Jan 20 '18 at 10:21

After trying for sometime, I have figured out that the only way it makes sense is when I consider the ratings are each winding and not for the 3 phase transformer.

Each winding is rated Q kVA and V1/V2

Now when you connect three windings additively, you get a single phase transformer with rating 3V1/3V2 and 3Q kVA


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