Q1. 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)
Q1. With respect to the High Voltage power systems installation, explain the different types of circuit breaker that are used, comparing them on merits and de-merits. Describe the theory of arc phenomenon and the mechanism fitted to mitigate the arc. (16)
Q5. With respect to High Voltage Electric system:
a) What are reasons for using high voltage on board ship? Enumerate the advantages and disadvantages of using HV systems onboard ship? (6)
b) There are mainly four types of high voltage testing methods applied on high voltage equipment and these are i) Sustained low frequency tests ii) Constant DC/AC test iii) High frequency test and iv) Surge or impulse test. Briefly explain how these tests are conducted. (10)
Q2. What is a Marine High Voltage System? Sketch and describe a Shipboard high voltage switch board and its protective devices. (16)
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