HV Exit Exam • Set 6 Question 20 of 30
In modern high-speed EHV circuit breakers, the total operating opening time from receipt of trip command to contact separation is in the order of:
✓
Direct Answer
Option B: 0.015 to 0.030 sec (15 to 30 ms)
High-speed circuit breaker opening mechanisms accelerate the moving contacts to achieve separation within 15 to 30 milliseconds (1 to 1.5 cycles) after trip coil energization.
All Options
A
0.001 sec (1 ms)
B
0.015 to 0.030 sec (15 to 30 ms)
(Correct Answer)
C
0.50 sec (500 ms)
D
2.0 sec
Detailed Explanation & Context
High-speed circuit breaker opening mechanisms accelerate the moving contacts to achieve separation within 15 to 30 milliseconds (1 to 1.5 cycles) after trip coil energization.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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