For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used?
Correct answer: D. 1.6 Wb/m2
- A. 1.0 Wb/m2
- B. 1.1 Wb/m2
- C. 1.3 Wb/m2
- D. 1.6 Wb/m2
- E. None of the above
Explanation
Cold-rolled grain-oriented steel has low core loss and can operate at a comparatively high flux density. For a 275 kV transformer, the referenced design value is approximately 1.6 Wb/m².
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