In the name of Allah most beneficent and merciful
In this article you will understand how Electricity is
“generate and consume” aboard ship. The distribution principal is something
same like in domestic purposes but there is a difference, no need of lengthy
cable in ship. Only a kilometer / half kilometer is maximum length of cable
running across the ship length. So very much high power generation plant system
is not required on ship e.g. in MW. There are only some minor losses of
electricity on board.
The alternator produces electricity which is then goes to
the ECR (Engine Control Room) through bunch of wire from beneath of ECR. These
wires then led to the rectangular bar at back of panel known as busbar.
The main advantage of these bars over the cable is that it
can easily connect a Motor starter panel or any other kind of load. The main
switch board now distribute into several other panel which are listed below.
1.
Feeder panel
No. 1 440 VAC
2.
Feeder Panel
No. 2 440 VAC
3.
Feeder Panel
No. 1 110 VAC
4.
Feeder Panel No. 2 110 VAC
5.
Generator Panel No.1
6.
Generator Panel No. 2
7.
Generator Panel No. 3
8.
Synchronizing Panel
9.
Group Starter Panel No. 1 (440 VAC)
10.
Group starter Panel No. 2 (440 VAC)
11.
Earth Monitoring Panel
12.
Distribution Box Panel
Now in the bus bar we have 440 VAC coming from generator but
for some machinery we required only 110 VAC.
So for this we have usually Air Cooled transformer.
Generator Panel No. 1
On Screen
The panel of generator must have essential parameter to
display, the figure which are non-essential can be local displayed e.g. RPM,
Boost Air (Scavenge air ) pressure, Sea Water pressure, Cooling water pressure,
differential pressure. Normally on screen reading are Lube oil Pressure, Lube
Oil In/Out, Jacket Water out temperature,
On Vertical Rack
Mostly Alternator side parameters are displayed on it.
E.g. Voltage, Current and Kilowatt.
Selector switch for Voltage and current are given so that one can switch to
other phase to check voltage and current are present on other phases. Standby by button is also provided on the
panel.
Some two more instrument are provided on the ship e.g.
Synchroscope, Synchroscope selector switch,
Then the electricity which are on bus bar is led to the
Feeder panel No. 1, where Group starter panel of are present.
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Generator to ACB
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ACB to Bus bar
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Bus bar to different
load/panel (motor, etc)
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