Class 2 (2nd Engineer) MET 📅 Jun 2025

Exam Question

Discuss the criteria of the classification of marine high voltage for A.C. and D.C. Systems. Sketch a Ships high voltage distribution system and explain its features. Discuss the various methods of testing the insulation of HV system. Mention the significance of PI test, why 3 terminals insulation testers are used in HV insulation measurements. (16)

Reference Answer

Marine high voltage systems are classified based on voltage levels:
AC Systems : High voltage is classified as any voltage above 1000 volts (1 kV) .
DC Systems : High voltage classification starts at 1500 volts (1.5 kV) .
Typical marine high-voltage systems operate at standard levels such as 3.3 kV , 6.6 kV , and 11 kV .

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