What does the main electrical distribution system provide power to ?
Motors
Lighting
Weapons systems
1 of 22
List three basic items to generate electricity.
Prime mover
AC Generator
SwitchBoard
2 of 22
List the 7 major components of the power distribution system.
Generator
Supply, Bus bar,interconnecting breakers
SwitchBoard
Feeder breaker
Electrical distribution centres(EDC)
Fuse panel
Transformer
3 of 22
List the 4 reference books.
Power book
Low power/lighting book
Portable Apparatus drawing book
Reference to fittings book
4 of 22
Where are these books located ?
Normally stored in a central location i.e- main switchboard or electrical workshop.
5 of 22
What is found in the power book ?
Distribution of all 450V services
Contains drawings of generators and switchboard circuit layout
Drawings of distribution circuits
6 of 22
What is found in the Low power/Lighting book ?
Distribution of all 115V services
Specifically concerned with Lighting systems
7 of 22
What is found in the Portable Apparatus Drawing book ?
Distribution of 115V/230V
Specifically concerned with 115V/230V sockets
8 of 22
What is the main supply and where is it fed to ?
It is 450V, 60Hz, 3 phase and is fed to an EDC
9 of 22
What does EDC stand for ?
Electrical Distribution Centre
10 of 22
What does MCCB stand for ?
Moulded Case Circuit Breaker
11 of 22
What are the types of fuse box used in a low power circuit
Type B
Type C
12 of 22
What do we use a Type B fuse box ?
To make sure the output is balanced
13 of 22
What is the order that breakers trip ?
Breaker nearest fault will trip first
Breaker furthest fault will trip last
MCCB first
Supply breaker Last
14 of 22
What is the order that fuses blow ?
Fuse nearest the fault will blow first
Fuse furthest from fault will blow last
15 of 22
What are the discrimination ratios for 440V and 115V ?
440V-3:1
115V-2:1
16 of 22
What does PCP stand for where is it located and what does it control ?
The primary control position is located in the SCC and controls all Main breakers/Generator Voltages/Generator Frequencies and anti condensation heaters in switchboards
17 of 22
What does SCP stand for, where is it located and what does it control ?
The secondary control position is located inside machinery spaces and controls local: breakers/Generator voltages/Generator Frequency and anti condensation heater in the switchboard.
18 of 22
List 6 meters found on a switchboard
Volt meter
Watt meter
Frequency meter
Ammeter
Synchroscope
Earth fault indicator
19 of 22
List the 9 steps for connecting to a shore side supply.
1.Send signal to port 2.Raise permit to work
3.Rack out breakers 4.Prove box is 'dead'
5.Obtain castle key 6.Test shore supply cables
7.Bring on and secure the cables 8. connect cables
9.Inform dockyard to turn on power
20 of 22
Where and how should the ship be earthed when alongside ?
The ship should be earthed to the jetty gangway and at least 2 points no less than half the ships length apart.
21 of 22
List the three types of change over switch.
ACOS(Automatic Change over switch)
ROCOS(Remote Operated Change Over Switch)
HCOS(Hand Change Over Switch)
22 of 22
Other cards in this set
Card 2
Front
List three basic items to generate electricity.
Back
Prime mover
AC Generator
SwitchBoard
Card 3
Front
List the 7 major components of the power distribution system.
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