For which of the following ratings of the transformer differential protection is recommended ?
Correct answer: B. equal to and above 5 MVA
- A. above 30 kVA.
- B. equal to and above 5 MVA
- C. equal to and above 25 MVA
- D. none of the above
Explanation
Transformer differential protection is normally applied to larger transformers because its cost and complexity are justified at higher ratings, commonly around 5 MVA and above. Thus the threshold given in option b is the standard textbook choice.
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