HV Exit Exam • Set 7 Question 13 of 30
Air blast circuit breakers designed for 400 kV extra-high-voltage systems are engineered to extinguish the arc within:
✓
Direct Answer
Option B: 40 to 60 milli-seconds (approx. 2 to 3 cycles)
High-voltage air blast circuit breakers clear faults within 40 to 60 milliseconds (approx. 2 to 3 cycles on 50 Hz power networks).
All Options
A
50 micro-seconds
B
40 to 60 milli-seconds (approx. 2 to 3 cycles)
(Correct Answer)
C
500 milli-seconds
D
5 seconds
Detailed Explanation & Context
High-voltage air blast circuit breakers clear faults within 40 to 60 milliseconds (approx. 2 to 3 cycles on 50 Hz power networks).
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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