GATE EE 2014 Set 2 — Question 22
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Electrical Machines → Three-Phase Transformers → Auto-Transformer
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Question
A single phase, , two winding transformer is connected as an autotransformer as shown in the figure.
The kVA rating of the autotransformer is _____________.
Correct answer
545 to 555
Solution
Given a two-winding transformer with rating , .
1.Calculate rated currents of the windings:
- Rated current of the winding:
- Rated current of the winding:
- From the figure, the winding is the common winding and the winding is the series winding.
- The input voltage is .
- The output voltage is .
- The series winding () carries the output current. Its maximum rated current is .
- .
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