Q1
(a) 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.
(8)
(b) 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 measurement
(8)
Reference Answer
### Part (a): Marine High Voltage Systems #### Criteria for Classification of Marine High Voltage High Voltage (HV) on board ships is defined by classification societies, primarily based on the International Electrotechnical Commission (IEC) standards (IEC 60092-503). The classification criteria distinguish HV from Low Voltage (LV) systems based on nominal voltage levels. * **A.C. Systems**: A system with a nominal voltage **exceeding 1000V (1kV) AC** is classified as a High Voltage system. Common marine AC HV levels are:
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