HV Exit Exam • Set 6 Question 7 of 30
The total fault clearing time of a modern high-speed high-voltage circuit breaker (relay time plus breaker opening and arcing time) is typically:
✓
Direct Answer
Option D: A fraction of a second (typically 30 to 80 milliseconds / 2 to 4 cycles)
Modern high-speed circuit breakers clear short-circuit faults within 2 to 5 cycles (approximately 30 to 100 milliseconds) from fault initiation.
All Options
A
Several minutes
B
10 to 30 seconds
C
5 to 10 seconds
D
A fraction of a second (typically 30 to 80 milliseconds / 2 to 4 cycles)
(Correct Answer)
Detailed Explanation & Context
Modern high-speed circuit breakers clear short-circuit faults within 2 to 5 cycles (approximately 30 to 100 milliseconds) from fault initiation.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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