In a delta-wye transformer setup, how much phase displacement occurs?

In a delta-wye transformer setup, a phase displacement of 30 degrees occurs. This is due to the nature of the transformation between the delta (Δ) and wye (Y) configurations. In the delta configuration, each phase is connected in a closed loop, while in the wye configuration, each phase connects to a common neutral point.

When the transformation takes place, the voltage and current relationships change, resulting in a shift in phase. Specifically, the voltage across the phases in the delta configuration lags the voltage at the corresponding phases in the wye configuration by 30 degrees.

This 30-degree phase displacement is significant in applications involving three-phase systems, affecting how power is distributed and how motors and other equipment operate. Understanding this displacement helps in correctly analyzing the performance and efficiency of electrical systems that utilize transformers.