In a three-phase transformer connection with a delta-connected primary and wye-connected secondary, a wye-connected secondary with center tap can, under the right conditions, experience extreme unbalance problems.

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This is because if the loads on the wye-connected secondary are not evenly balanced, then a large unbalance can occur due to the center tap. This can cause excessive currents to flow in the neutral conductor, potentially leading to overheating and damage to the system.

In a Three-Phase Transformer Connection with a Delta-Connected Primary and Wye-Connected