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1) in a ship where do we get the earth is connected to?
2) in a 3 phase supply where does the neutral is connected
to in a ship normally?
3) how does we make the best 24v dc wiring for the ship at
the bridge panels which mostly work on 24v dc voltage and
how do we differentiate its wiring from ac wiring?
4)what is a synchronizer and why do we need it compulsory
in a ship?
5) in a blackout condition how does a ship get its back up
power?
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Answer Posted / rob
1. The earth is connected to the ship's hull.
2. The neutral is isolated in a ship, NOT connected to the hull. Therefore it is necessary to have two earth faults before the protection breaker will open. This is for safety purposes so there is not a blackout (all systems dead) when a earth fault occurs.
3. Question is unclear. Usually there is a dedicated 24VDC distribution system from batteries and charging system.
4. It is needed to parallel the generators during change-over so a blackout is not necessary.
5. Emergency generator must start within 30 sec of blackout.
| Is This Answer Correct ? | 25 Yes | 4 No |
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