Electrician Red Seal · Question
A three-phase Delta-Delta transformer bank is supplying a balanced resistive load. An electrician measures the primary line current at 15 A. If the transformer has a turns ratio of 2:1 (primary to secondary), what is the approximate secondary line current?
For a Delta-Delta transformer, the line current ratio is the inverse of the turns ratio. If the turns ratio (primary turns / secondary turns) is 2:1, then the l
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Question: A three-phase Delta-Delta transformer bank is supplying a balanced resistive load. An electrician measures the primary line current at 15 A. If the transformer has a turns ratio of 2:1 (primary to secondary), what is the approximate secondary line current?
Answer options:
- 7.5 A
- 15 A
- 26 A ✅ 30 A
Correct answer: 30 A
Explanation: For a Delta-Delta transformer, the line current ratio is the inverse of the turns ratio. If the turns ratio (primary turns / secondary turns) is 2:1, then the line current ratio (secondary line current / primary line current) is 2:1. Therefore, the secondary line current is 2 * 15 A = 30 A.
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