For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?
Correct answer: C. 2.2 to 3.2 A/mm2
- A. 1.0 to 1.2 A/mm2
- B. 1.5 to 2.0 A/mm2
- C. 2.2 to 3.2 A/mm2
- D. 3.2 to 4.2 A/mm2
Explanation
Large transformers with oil cooling or air-blast cooling commonly use a conductor current density of about 2.2 to 3.2 A/mm². The permissible density is higher than in small or naturally cooled transformers because heat removal is more effective.
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