GATE EE 2017 Set 2 — Question 45
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Electrical Machines → Three-Phase Transformers → Connections & Vector Groups
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Question
If the primary line voltage rating is (Y side) of a , Y- transformer (the per phase turns ratio is 5:1), then the line current rating of the secondary side (in Ampere) is ______.
Correct answer
37 to 39
Solution
1.Identify given values:
Apparent power rating Primary line voltage
Turns ratio
2.Calculate primary phase voltage:
The primary is star-connected (Y):3.Calculate secondary phase voltage:
4.Calculate secondary line voltage:
The secondary is delta-connected ():5.Calculate secondary line current rating:
Thus, the line current rating of the secondary side is approximately , which falls within the range of 37 to 39.
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