Question

On two sides of a 3-\(\phi\) star / delta transformer the

• A. Voltages differ by 60° and currents differ by 30°
• B. Voltages differ by 30° and currents differ by 60°
• C. Both voltages and currents differ by 60°
• D. Both voltages and currents differ by 30°

Hint:

Star-delta transformers introduce a 30° phase shift in both voltage and current.

Answer 1

The Correct Option is D

- In star-delta or delta-star transformers, a 30° phase shift occurs.
- The phase difference affects both voltage and current phasors accordingly.