HV Exit Exam • Set 2 Question 25 of 30

What device trips an HV transformer if gas accumulation or oil surge occurs due to internal fault?

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Direct Answer

Option C: Buchholz Relay

The Buchholz relay is a protective device installed in oil-filled transformers to detect internal faults. It reacts to gas accumulation or sudden oil surges caused by arcing or insulation breakdown. This mechanical protection is vital for preventing catastrophic transformer failure and fire, as specified in marine electrical safety standards.

All Options

Speed governor

Thermocouple

Buchholz Relay (Correct Answer)

Reverse power relay

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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