HV Exit Exam • Set 7 Question 8 of 30
The number of power-frequency AC cycles in which a modern high-speed circuit breaker completes its tripping and arc clearing operation is:
✓
Direct Answer
Option A: 2 to 5 cycles
Modern high-speed circuit breakers clear short-circuit faults within 2 to 5 cycles (30 to 100 ms on a 50/60 Hz system).
All Options
A
2 to 5 cycles
(Correct Answer)
B
10 to 18 cycles
C
20 to 30 cycles
D
40 to 50 cycles
Detailed Explanation & Context
Modern high-speed circuit breakers clear short-circuit faults within 2 to 5 cycles (30 to 100 ms on a 50/60 Hz system).
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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