HV Exit Exam • Set 6 Question 16 of 30
In SF6 gas circuit breakers, the nominal gas operating pressure within the interrupter chamber is typically in the order of:
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Direct Answer
Option C: 3 to 6 kg/cm² (approx. 0.3 to 0.6 MPa / 3 to 6 bar)
Modern single-pressure SF6 puffer circuit breakers operate at gas pressures between 3.5 to 6 bar (0.35 to 0.6 MPa) at 20°C.
All Options
A
100 mm Hg
B
1 kg/cm² (atmospheric)
C
3 to 6 kg/cm² (approx. 0.3 to 0.6 MPa / 3 to 6 bar)
(Correct Answer)
D
50 to 100 kg/cm²
Detailed Explanation & Context
Modern single-pressure SF6 puffer circuit breakers operate at gas pressures between 3.5 to 6 bar (0.35 to 0.6 MPa) at 20°C.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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