ETO ETO Exam papers 📅 Dec 2022

Exam Question

It is proposed to operate a 'bow thrusters' unit from a 3.3 KV electrical supply. Outline suitable option for the design of installation under each of the following heading.

(a) Protection of main switch board

(b) Overload of a bow thrusters motor

Reference Answer

(a) Protection of Main Switchboard (MSB):
Design a separate HV side panel for the bow thrusters, isolated from adjacent LV panels.
Ensure independent earthing system for the HV side, connecting to the ship's hull.
Incorporate harmonic filters on both ends of the HV busbar to avoid waveform distortion.

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