HV Exit Exam • Set 3 Question 18 of 30

Lower voltage systems supplied through step-down transformers from high-voltage systems must be protected against overvoltages. This is achieved by:

✓

Direct Answer

Option C: Both A and B

Protection against HV-to-LV breakdown in transformers is achieved by earthing the secondary neutral (solidly or via impedance) or installing neutral voltage limiters (surge arresters/spark gaps).

All Options

Direct earthing of the lower voltage system neutral

Appropriate neutral voltage limiters (surge arresters / spark gaps)

Both A and B (Correct Answer)

Increasing cable insulation thickness only

Detailed Explanation & Context

Protection against HV-to-LV breakdown in transformers is achieved by earthing the secondary neutral (solidly or via impedance) or installing neutral voltage limiters (surge arresters/spark gaps).

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

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