Day 1 Stuff Flashcards

To learn power and distribution

1
Q

How many diesel generators are fitted on a normal RN ship?

A

4

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2
Q

What does EDC stand for?

A

Electrical distribution centre

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3
Q

How many EDCs are connected to a normal distribution system?

A

2

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4
Q

What does MCCB stand for?

A

Molded Case Circuit Breaker

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5
Q

List 5 main breakers and their uses in a generic distribution system?

A

Supply breaker - allows to isolate the supply in case of an earth

Interconnecting breaker - allows to isolate 2 switchboards from each other

Busbar linking breakers - allows to isolate bus bars from each other

Feeder breakers - allows to isolate the drain from the switchboards

Shore/ship supply breakers - allows to isolate the ship from another ship or from the shore supply

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6
Q

What is the power book?

A

The power book contains all the 440V supply diagrams to use when circuit tracing to diagnose a problem in the 440V system

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7
Q

What is the low power and lighting book?

A

The low power and lighting book is used for all 115V systems which contains the lighting system, this is so that you can see where a problem might be

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8
Q

What is the discrimination ratio for 440V?

A

3:1

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9
Q

What is the discrimination ratio for 115V?

A

2:1

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10
Q

Explain breaker discrimination?

A

Breaker discrimination is where the breakers increase in size as you get closer to the supply to accommodate earth faults

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11
Q

What does MCR stand for?

A

Machinery control room

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12
Q

What does PCP stand for?

A

Primary control position

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13
Q

What does SCP stand for?

A

Secondary control position

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14
Q

List the meters fitted to a switchboard generator section

A

Voltages

Frequency

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15
Q

What meters are on the switchboard?

A
Voltmeter
Frequency meter
Power meter
Synchroscope
Earthfault indicator
Ammeter
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16
Q

Where are the breaker switches found and what are they called?

A

Primary control position

Supply breakers
Alternative supply breakers

17
Q

How would you connect to a shore supply?

A
Send a signal to port 24h in advance
Raise a permit to work
Rack out breakers
Prove supply box is dead
Get the castel key
Test the shore side cables
Bring on the cables and secure them
Connect the cables
Inform the dockyard
18
Q

What rules are in place when earthing a ship to the shore?

A

2 earthing lines no less than half the ships length apart
Must be earthed to the jetty or to the ship alongside
Gangways must be earthed

19
Q

What is used to ensure correct phase rotation with the shore?

A

Shore supply phase connection lights

20
Q

What would happen to a motor if the phase rotation is wrong?

A

Either the motor won’t start or it will start in reverse

21
Q

List 3 types of hand change over switch

A

Normal alternative
Normal emergency
Normal alternative emergency

22
Q

List 3 kinds of change over switch

A

Hand change over switch
Automated change over switch
Remotely operated change over switch

23
Q

Where are the 440V earth testing facilities found?

A

They are found in the switchboard.

It tests between live and earth and if it reads 0V then there is an earth fault

24
Q

Why are there separate 115V earth testing facilities to the 440V?

A

Because there is no physical connection in the transformer so there can be no continuity between the 440V and 115V lines