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Prateek Asked :

23-05-2021 Delta Star Transformation

Q. In which of the circuit given positive and negative sequence currents will flow in primary?

A. Star/delta
B. Star/star
C. Open delta/delta
D. Delta/delta

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Dapzoi Verified
Commented on 2021-05-23 10:47:28 (IST)
Answer : D

Explanation : The only positive and negative sequence currents flow in the lines on the delta side. This could also be achieved by star-connected primary provided the primary and secondary star points are grounded. But this is not recommended on account of flow of ground current for unbalanced secondary loads.