Exam Question

With respect to High Voltage Electric system

(a) What are the reasons for using high voltage on board ships? Enumerate the advantages and disadvantages of using HV systems onboard ships? (6)

(b) Briefly explain the 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)