ETO ETO Exam papers 📅 Jun 2022

Exam Question

With respect to Generators and Main Circuit Breakers and their protection devices

(a) What are safeties incorporated in Air Circuit Breaker (ACB) of ship’s generator and prime movers (10)

(b) Write Short Note on Negative Phase Sequence Relay (6)

Reference Answer

(a) The followings are the ACB safeties incorporated in ship’s generator:
Under voltage trip (set 50% of rated voltage).
Over current trip. (Long time delay, short time delay and Instantaneous trip).
(i) Long time delay – 105% - 120% of FLC, 20 – 120 sec.

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