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Zero sequence currents can flow from a line into a transformer bank if the windings are in
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- ground star/ delta
- delta/ star
- star/ grounded star
- delta/ delta
Correct Option: A
The zero-sequence currents, which are in phase with each-other, can flow only if the connections of the 3-phase transformer are such that the corresponding phases on the two sides of the constraint that net mmƒ acting on the core for any phase is zero. The arrows show the path of zero-sequence currents.
