GATE EE 2016 Set 1 — Question 52
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Electrical Machines → Three-Phase Transformers → Connections & Vector Groups
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Question
If the star side of the star-delta transformer shown in the figure is excited by a negative sequence voltage, then
Correct answer
(D) V_(AB) lags V_(ab) by 30^
Solution
1.In a standard star-delta () transformer connection, there is a phase shift between the primary and secondary line voltages.
2.For a positive sequence voltage, the star side line voltage () typically leads the delta side line voltage () by (assuming a connection, which is standard practice).
3.When the transformer is excited by a negative sequence voltage, the phase sequence is reversed. This causes the phase shift to also reverse its direction.
4.Therefore, if the positive sequence shift is (lead), the negative sequence shift will be (lag).
5.Consequently, will lag by .
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