Air blast circuit breakers for 400 kV power system are designed to operate in_______________?
Correct answer: B. 50 millisecond
- A. 100 microsecond
- B. 50 millisecond
- C. 0.5 sec
- D. 0.1 sec
Explanation
High-voltage air-blast circuit breakers are designed for rapid interruption, typically within about 50 milliseconds at this voltage level. The microsecond value is too short for complete breaker operation, while the other values are comparatively slow.
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