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eLectrics > Power and Distribution > Flashcards

Power and Distribution Flashcards

1
Q

What are the 3 basic items needed for power generation?

A
  • Prime mover
  • A generator
  • Switchboard
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2
Q

What does EDC stand for?

A

Electrical distribution center

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3
Q

What does MCCBs stand for?

A

Moulded case circuit breakers.

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4
Q

What does a Supply breaker do?

A

Connect generator output to the switchboard.

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5
Q

What does a shore supply breaker do?

A

Connects shore supply or supply from another ship to the switchboard and connects the ships supply to another ship.

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6
Q

What does a bus bar linking breaker do?

A

Connects two bus bars of the same voltage in a switchboard together

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7
Q

What does an interconnector breaker do?

A

Connects 2 switchboards together

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8
Q

What does the Power book show?

A

The distribution of all 440V services.

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9
Q

What does the lighting book show?

A

115V/230V systems

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10
Q

What does the portable appliance book show?

A

Power supplies with 115/230V sockets

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11
Q

What does the reference to fittings book show?

A
  • Store numbers
  • Types of fittings
  • Number of fittings
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12
Q

What are the 7 main components to the power and distribution system?

A
  • Generator
  • Supply breaker
  • Switchboard section
  • Feeder breaker
  • Fuse panels
  • Transformers
  • Distribution panels
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13
Q

What is the first breaker to trip?

A

MCCB
Closest breaker to the fault

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14
Q

What is the last breaker to trip?

A

Supply breaker
Furthest away from the fault

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15
Q

What ratio does 440V discrimination use?

A

3:1

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16
Q

What ratio does 115V discrimination use?

A

2:1

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17
Q

What does PCP stand for and where is it operated?

A

Primary control position
SCC

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18
Q

What does SCP stand for and where is it located?

A

Secondary control position
Switchboard sections

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19
Q

What are the 6 meters that provide infomation about power supplied by shore supply?

A
  • Voltmeter
  • Frequency meter
  • Watt meter
  • Ammeter
  • Syncroscpe
  • Earth fault indicator
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20
Q

What actions are required for connecting to shore supply?

A
  • Send signal to port
  • Raise a permit to work
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21
Q

How to remember which Light should be bright to ensure a good connection to shore supply?

A

Right is bright, everything alright

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22
Q

Where are the earth cables fitted when connect to shore supply?

A
  • To the jetty
  • To the ship along side
  • Gangway
  • At two points not less than half the ships length apart
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23
Q

What are the types of hand changeover switches?

A
  • Normal/alternative
  • Normal/emergancy
  • Normal/alternative/emergancy
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24
Q

What are the categories of changeover switches?

A
  • Automatic changeover switch
  • Remote operated changeover switch
  • Hand changeover switches
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25
Q

What does C&C Stand for?

A

Control and Communications switchboard

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26
Q

What is a converted supply?

A

A supply that has its voltage and/or frequency changed from 450V/60Hz before it is distributed around the ship

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27
Q

What are the two converted supplies, supplied by the C&C switchboard?

converted supplies

A

24V DC
115V,400Hz

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28
Q

What does TRU stand for?

A

Transformer rectifier unit

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29
Q

What does RTR stand for?

A

Rationalised transformer rectifier.

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30
Q

What are the earth testing arrangements on C&C switchboard?

A

Integral light

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31
Q

What is a battery?

A

Number of cells connected in series

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32
Q

What are the 2 categories of batteries?

A

Primary
Secondary

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33
Q

What are the 4 main charactaristics of primary batteries/cells?

A
  • Not reachargable
  • Known as dry cells
  • Once discharged theyre thrown away
  • Normally small
34
Q

What are the 4 main characteristic of secondary batteries/cells ?

A
  • Rechargeable
  • Wet cells
  • Requires specialist recharging equipment
  • Variety of sizes
35
Q

What is the Capacity of a battery measured in?

A

Amp-hour (Ah)

36
Q

What is the voltage of a fully charged cell?

A

2.1V

37
Q

What is the voltage of a fully discharged cell?

A

1.75V

38
Q

What is the output of AC generators on T23?

A
  • 1.3MW
  • 600V
  • 61.2Hz
  • 3 Phase
39
Q

What are the seven types of breakers used in the type 23 distribution system?

8 mark label question

A
  • Supply breaker
  • Interconnector breaker
  • Shore supply breaker
  • Electric motor breaker
  • Motor generation feeder breaker
  • Motor generator supply breaker
  • Diesel generator alternative supply breaker
40
Q

What Voltage is used exlusively for the electric propulsion system on a T23?

A

600V

41
Q

3 types of EDPs fitted to the type 23?

A

Type 1
Type 2
Type 3

42
Q

What is a shedable EDC

A

Non essensial equipment:
* Galley
* Laundry
* Miscellaneous lighting

42
Q

Can the shedables be tripped?

A

Yes, to provide more power to electric motors or reduce power consumption around the ship.

43
Q

What does the T23 emergancy switchboard supply?

A
  • Steering motors
  • HPSW pumps
  • Surgery/sickbay
  • Smoke clearance exhaust fans
  • Portable pump sockets
44
Q

What 8 basic components is the electric propulsion motor system comprised of?

Explain or label (8 marks)

A
  • Armature
  • Commutator
  • Brush gear
  • Cooling fans
  • Air filter
  • Yoke
  • Compoles
  • Main pole
45
Q

Describe electrical motor cooling

A
  1. Cool air is drawn through the motor
  2. Done by 2 ventilation fans
  3. Air is forced over the main poles, armature commutator and brush gear
  4. Cool air absorbs the heat generated in the motor
  5. Its exhausted from the motor at the commutator end
  6. The air is the forced through a water cooled heat exchanger into the engine
46
Q

What happens if the heat exchanger fails?

A
  • 2 emergancy inlet panels are removed
  • Allows air to be drawn into the cabinet by the circulating fan
47
Q

What do the gas turbine driven generators produce?

A
  • 4160V
  • 60Hz
  • 3 Phase
  • Capacity of 21MW
48
Q

What do the diesel driven generators produce?

A
  • 4160V
  • 60Hz
  • 3 Phase
  • 2MW
49
Q

What is a harmonic filter?

A
  • Used to ensure the quality requirements of the power supply
  • Smooth the sine waves of the voltage supply
  • Uses capacitors and resistors
50
Q

What does IEP stand for?

A

Intergrated electric propulsion
(known as integrated electric drive)

51
Q

What is connected to the bus bar supplied by the output of the 21MW generator?

A

19MW advanced induction propulsion motor.

52
Q

What does PMS stand for?

A

Platform management system

53
Q

What does EPMS stand for?

A

Electrical Power management system

54
Q

When are navigation lights tested and by who?

A

1 hour before sunset by the duty ET(ME)

55
Q

Who are the times of when the navigation lights are tested obtained from?

A

OOD/OOW

56
Q

When are navigation lights switched on?

A

Sunset

57
Q

When are navigation lights switched off?

A

Sunrise

58
Q

What does NLCP stand for?

A

Navigation Lights Control Panel

59
Q

What are the Statutory navigation lights?

A

Compulsory and must be switched on at sunset on every ship

60
Q

What colour are the statuary lights and where are they located?

A
  • Side lights–> PORT-red, STBD-green
  • Masthead steaming lights–> FWD and AFT-White
  • Stern light–>deck level-white
61
Q

What are the emergency statutory lights supplied by?

A

Two series-connected 12V batteries

62
Q

What are the special operation lights operated by?

A

VCS 428 unit

63
Q

When are special operation lights tested?

A

1 hour before sunset

64
Q

What colour and where are the not under command lights?

A
  • 2 steady red lights port and 2 steady red lights STBD
  • Vertically mounted on the main mast
  • Switched on when the ship will not answer the helm
65
Q

What colour and where are the lights used for a RAS?

A
  • 2 steady red lights port and 2 steady red lights STBD
  • A single white light both sides between the red lights
  • Vertically mounted on the main mast
  • Switched on whenever there is a RAS
66
Q

What colour and where are the lights used in a man overboard situation?

A
  • 2 red flashing lights port ans 2 red flasheing lights STBD
  • Vertically mounted on the main mast
  • Switched on when someone has fallen overboard
67
Q

When are the emergency special operation lights tested?

A

1 hour before sunset

68
Q

What must happen before the emergency special operation lights are hoisted up the mast and why?

A
  • Plugged in and switched on
  • If not, an induced current maybe present due to radar and aerial interference
68
Q

What lights are classed as miscellaneous lights?

A
  • Anchor lights
  • Mast obstruction lights
  • Hostable towing light
69
Q

Where are the anchor lights fitted and what colour are they?

A

fitted on the top of the FWD and AFT jackstaffs
-White

70
Q

Where are the mast obstruction lights fitted and what colour are they?

A

Port and STBD mainmast top
-red

71
Q

When is weather deck lighting tested?

A

1 hour before sunset

72
Q

What 4 components is the fluoresent light comprised of?

A
  • Starter
  • Tube
  • Choke coil
  • Switched supply
73
Q

What does the tube contain?

A
  • Interior is coated in fluoresent phosphor
  • Filled with low pressure argon gas
  • Contains a small amount of mercury
74
Q

What does AEL stand for?

A

Automatic emergency lights

75
Q

What does the rear of the T23 AEL comprise of?

A
  • PCB retaining clip
  • Base casting clip
  • Battery retaining clip
  • Battery 2.4V
  • Terminal block
76
Q

What does the printed circuit board (PCB) on the T23 AEL comprise of?

A
  • Battery connections (+ve & -ve)
  • Test push switch
  • Pilot indicator lamp
  • Main Lamp
77
Q

Where is the printed circuit board on the T45 AEL and what does it control?

A

Found on the inside cover
Controls operation of the lights

78
Q

What is the T45 AEL comprised of?

A
  • Light operation PCB
  • Power source control
  • Connection for ships power
  • Battery cover

eLectrics (2 decks)

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