GATE EE 2015 Set 2 — Question 61
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Electrical Machines → Three-Phase Transformers → Phase Shift & Clock Notation
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Question
Two three-phase transformers are realized using single-phase transformers as shown in the figure.
The phase difference (in degree) between voltages and is ______.
The phase difference (in degree) between voltages and is ______.
Correct answer
30 to 30
Solution
The first transformer bank is connected in Star-Star (Y-y) configuration. For a Y-y connection, the phase shift between the primary and secondary line-to-line voltages is . Thus, the phase of is .The second transformer bank is connected in Star-Delta (Y-d) configuration. For a standard Y-d connection (specifically Y-d1 or Y-d11), the phase shift between the primary and secondary line-to-line voltages is . Thus, the phase of is .The phase difference between and is .
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