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Ltheory2 > Power And Distribution > Flashcards

Power And Distribution Flashcards

1
Q

What 3 items do you need to generate power?

A 
Prime mover
AC gen (alternator)
switchboard
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2
Q

Examples of a prime mover

A

Gas turbine
Steam turbine
Diesel engine

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3
Q

What does a switchboard do?

A

Control and distribute power around the ship

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4
Q

How many generators does a ship generally have?

A

4

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5
Q

Name components of a Main Electrical Distribution system

A 
Prime mover
Generator 
Supply breakers
Switch boards
Bus bar
Electrical Distribution Centres (EDC)
Feeder breakers 
Bus bar linking breakers interconnecting
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6
Q

“As Fitted” package contains which books

A

The power book
Low power and lighting book
Portable apparatus book

Engineers fittings reference book

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7
Q

Power book shows..

A

The distribution of all 450 volt services

Drawings of gens and switchboard circuit + distribution circuits

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8
Q

Low power and lighting book shows ..

A

Distribution of 115 volt

Specially concerned with lighting

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9
Q

Portable apparatus drawing book shows..

A

Distribution of 115/230 volt services

Specifically concerned with power supplies to 115/230 volt sockets

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10
Q

Where can the books be found on ship?

A

Central place i.e main switchboard or electrical workshop

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11
Q

What’s the main supply fed to an electrical distribution centre (edc)

A

450v 60Hz 3 phase

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12
Q

What’s an MCCB?

A

Moulded case circuit breaker

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13
Q

How many phases required for a lighting circuit?

A

1 phase

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14
Q

What’s the purpose of breakers and fuses?

A

The protect the power supply

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15
Q

What’s the first breaker to trip?

A

MCCB

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16
Q

What’s the last breaker to trip?

A

Supply breaker

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17
Q

Control of power and distribution is done from 2 positions. Name them

A

Primary control position (PCP)

Secondary control position (SCP)

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18
Q

Primary control position (PCP) controls…..

A

All main breakers
All gen voltages
All gen frequencies
Anti condensation heaters in switchboard

19
Q

Secondary control position (SCP) controls…..

A

Breakers controlled by section switchboard
Voltages of gens controlled by section switchboard
Frequency of gens controlled by section switchboard
Anti condensation heaters in switchboard

20
Q

What are the 6 meters in a switchboard?

A 
Voltmeter
Frequency meter
Watt meter
Ammeter
Syncroscope
Earth fault indicator
21
Q

What are the 6 indication lights on a switchboard?

A 
Control available/ not available 
Gen running
Fire detected
Over temp
Breaker tripped
Earth fault
22
Q

9 steps for connecting to shore supply

A
  1. Send signal to port
  2. Raise permit to work
  3. Rack out breakers
  4. Prove box ‘dead’
  5. Obtain castle key
  6. Test shore supply
  7. Bring on and secure cables
  8. Connect cables
  9. Inform dockyard
23
Q

When earthing for a shore supply where must the ship be earthed to?

A

The jetty
To the ship alongside
At 2 points not less than half the ships length apart
Gangways

24
Q

What are the 3 categories of change over switches

A

Automatic change-over switch (ACOS)
Remote operated change-over switch (ROCOS)
Hand change-over switch (HCOS)

25
Q

All equipment generating or operating at greater than ……AC OR ……DC ‘it’s been earth bonded

A

35v AC

50v DC

26
Q

What can you use to earth bond?

A 
Metal box 
Cabinet
Console
Cubicle
Frame
Starter
27
Q

2 types of portable electrical equipment

A

Class 1

Class 2

28
Q

What is used to connect two busbars in the same switchboard together?

A

Busbar linking breaker

29
Q

What requirement must exist to connect two busbars together?

A

Same voltage

30
Q

How many earth cables are required when the ship is alongside a jetty on shore supply?

A

2

31
Q

What’s the purpose of a changeover switch?

A

To provide normal and alternative supply to normal equipment

32
Q

What is sent from the ship 24 hours before arriving in port?

A

A logistical signal requesting shore supply

33
Q

Name the key that makes shore supply safe while connecting to the boxes?

A

Castel key

34
Q

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

A

It would go backwards

35
Q

What does SCC stand for?

A

Ships control centre

36
Q

Why are there separate 115v earth testing facilities?

A

No physical connection due to transformers

37
Q

Explain breaker discrimination

A

If there was a major fault on the ships supply system the main breaker would not trip straight away. The MCCB would be first to trip then the feeder breaker etc

38
Q

What is the reference book used for?

A

Used in conjunction with the power book and lists all fittings, the number fittings, component symbols and pattern numbers

39
Q

What’s the ratio for 440v fuse discrimination?

A

3:1

40
Q

What does MCR stand for?

A

Machine control room

41
Q

What are the breaker operating switches found on a switchboard called?

A

Discrepancy switch

42
Q

What’s the maximum current capacity for shore supply?

A

2000A

43
Q

What is used to confirm the correct phase connection with respect to shore supply

A

Phase sequence indicator

Ltheory2 (5 decks)

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