A transmission line is protected by_____________?
Correct answer: D. both (B) and (C)
- A. inrush protection
- B. distance protection
- C. time graded and current graded over current protection
- D. both (B) and (C)
- E. none of the above
Explanation
Transmission lines commonly use distance protection as the main protection, with time-graded or current-graded overcurrent protection as backup. Since both listed methods protect transmission lines, the combined option is correct.
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