In a given three-phase transformer connection with a delta-connected primary and wye-connected secondary, the secondary has been center-tapped to form a neutral conductor. The neutral conductor will ____.
A) carry the vector sum of the balanced current
B) not carry the vector sum of the balanced current
C) not carry the vector sum of the unbalanced current
D) carry the vector sum of the unbalanced current

Question

Quizplus · Accepted Answer

In a wye-connected system with a center-tapped neutral, the neutral conductor carries the vector sum of the unbalanced currents. If the system is perfectly balanced, there would be no current in the neutral. However, in the presence of unbalance, the neutral provides a return path for the unbalanced current, ensuring the system can operate properly.

In a Given Three-Phase Transformer Connection with a Delta-Connected Primary