Electrician Red Seal · Question
A three-phase, delta-wye connected transformer with a primary voltage of 600 V and a turns ratio of 10:1 (primary to secondary per phase) is supplying a balanced load. What is the approximate line-to-line secondary voltage?
For a delta-wye transformer, the line-to-line secondary voltage is the phase voltage multiplied by the square root of 3. With a 10:1 turns ratio, the phase volt
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Question: A three-phase, delta-wye connected transformer with a primary voltage of 600 V and a turns ratio of 10:1 (primary to secondary per phase) is supplying a balanced load. What is the approximate line-to-line secondary voltage?
Answer options:
- 34.7 V
- 60 V ✅ 104 V
- 208 V
Correct answer: 104 V
Explanation: For a delta-wye transformer, the line-to-line secondary voltage is the phase voltage multiplied by the square root of 3. With a 10:1 turns ratio, the phase voltage on the secondary is 600V / 10 = 60V. Therefore, the line-to-line secondary voltage is 60V * √3 ≈ 104V.
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