HV Exit Exam • Set 1 Question 30 of 30

What test is performed to measure moisture and gas breakdown in SF6 circuit breaker gas?

✓

Direct Answer

Option B: SF6 gas purity, dew point, and decomposition product analysis

SF6 gas is a potent dielectric medium, but its performance degrades due to moisture and decomposition products from arcing. Regular analysis of gas purity, dew point, and chemical composition is mandatory to ensure the circuit breaker maintains its rated interrupting capacity and prevents internal tracking or insulation failure.

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Titration

SF6 gas purity, dew point, and decomposition product analysis (Correct Answer)

Salt water test

Smoke test

Detailed Explanation & Context

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).

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Q1 What voltage level is defined as High Voltage (HV) under marine SOLAS and STCW regulations? Q2 What is the primary hazard of working on High Voltage marine equipment compared to Low Voltage? Q3 What safety document MUST be issued before performing maintenance on High Voltage switchgear? Q4 What mandatory step must be taken immediately after opening an HV circuit breaker and isolator? Q5 What medium is commonly used inside modern High Voltage marine circuit breakers for arc quenching? Q6 What safety equipment must be worn when racking in or out an HV circuit breaker truck? Q7 What is the purpose of earthing switches or portable earthing leads on isolated HV equipment? Q8 What key interlock system is used to enforce strict mechanical sequence during HV switching operations? Q9 What instrument is used to measure insulation resistance of High Voltage cables and machinery? Q10 Who is authorized to issue a High Voltage Permit to Work on a ship?