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Power And Distribution > Power And Distribution > Flashcards

Power And Distribution Flashcards

1
Q

What is the requirement for a system?

A

To provide power around the ship to run:
- Motors for auxiliaries, refrigeration, air conditioning.
- Lighting and converted supplies.
- Weapon systems, radar and sonar systems, external communications.
Requires a main distribution system to produce, monitor and control the electric demand as required.

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2
Q

What three basic items do we need to generate power?

A
  1. A prime mover; gas turbine, Diesel engine etc.
  2. AC generator also known as an alternator.
  3. A switchboard to control and distribute power around the ship.
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3
Q

What are the three power and lighting reference books?

A
  • The Power Book
  • Low Power and Lighting Book
  • Portable Apparatus Book
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4
Q

Name the six meters at control positions:

A
  1. Voltmeter.
  2. Frequency meter
  3. Watt meter.
  4. Ammeter.
  5. Syncroscope.
  6. Earth fault indicator.
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5
Q

What shows when there is an Earth fault.

A

A light indication and Audible alarm.

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6
Q

What are the nine steps required for connecting shore supply:

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

What are the four key points for earthing a shore supply:

A

The ship must be earthed:
- to the jetty
- to the ship along side
- at two points not less than half the ship’s length apart
- gangways are also to be earthed

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8
Q

describe the earth testing facility on a Contol and Communications switchboard?

A

A push button with an integral lamp is fitted to the switchboard

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9
Q

What are the seven breakers used in the distribution system?

A
  • Supply breakers
  • Interconnector breaker
  • Shore supply/ship alongside
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10
Q

What is the purpose of the converter regulator?

A

Regulates the voltage at 750VDC

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11
Q

What are the switches on a switchboard called for breakers

A

Discrepancy switches

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12
Q

How many diesel generators are fitted to a Generic Distribution System?

A

There are four diesel generators fitted to a ship

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13
Q

What does EDC stand for?

A

Electrical distribution centre.

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14
Q

How many EDC’s are fitted to a Generic Distribution System?

A

There are four EDC’s

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15
Q

What does MCCB stand for?

A

Moulded Case Circuit Breakers

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16
Q

List the five main brekers fitted to a Generic Distribution System and explain their use.

A
  1. Supply breaker
  2. Shore supply/ Ship alongside breaker
  3. Bus bar linking breaker
  4. Interconnector breaker
  5. Feeder breaker.
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17
Q

What is the power book and when is it used?

A

The Power Book shows the distribution of all 440V services used when tracing which services are fed from which fuse panel, transformer, MCCB and EDC.

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18
Q

What is the lighting book and when is it used?

A

The lighting book shows 115v and 230v and is used in the same way as the Power Book.

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19
Q

What is the reference book and when is it used?

A

The reference book is used in conjunction with the Power Book and lists all fittings, number fitted, component symbols and pattern numbers.

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20
Q

What is the ratio for 440V fuses regarding fuse discrimination?

A

3:1

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21
Q

What is the ratio for 155v fuses regarding fuse discrimination?

A

2:1

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22
Q

Explain breaker discrimination:

A

Breakers protect the main generator (electrical supply) from faults further down in the circuit. It would be impossible for a fault on a mess deck kettle to trip a main generator.

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23
Q

What does MCR stand for and when combined with HQ1 what does it become?

A

Machine Control Room and when combined it becomes the SCC.

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24
Q

What does PCP and SCP stand for?

A

Primary Control Position, Secondary Control Position.

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25
Q

List the meters fitted to a switchboard generator section.

A
  1. Voltmeter
  2. Ammeter
  3. KW meter
  4. Frequency Meter
  5. Syncroscope
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26
Q

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

A

Discrepancy switches located in the PCP

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27
Q

Describe the connection of shore supply:

A
  1. A signal is sent at least 24 hours prior to arrival requesting shore supply.
  2. A permit to work is raised prior to arrival.
  3. The shore supply box breakers are to be racked out.
  4. The shore supply box cover is removed and connections checked.
  5. A castle key is obtained from the dockyard.
  6. Continuity, non-contact and insulation resistance tests are carried out on the shore supply cables.
  7. Shore supply cables are brought onto the ship and secured. Sufficient slack must be left to allow for the rise and fall of tides.
  8. Cables are connected to shore supply box ensuring correct phase connection.
  9. Inform the dockyard who will then switch on the power.
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28
Q

What are the rules regarding to earthing the ship when connecting shore supply?

A

The ship must always be earthed to either the jetty or to the sip alongside by at least two point, not less than half than the ships length apart.

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29
Q

What is used to confirm correct phase rotation with respect to shore supply?

A

The phase sequence indicator (2 lamps) the right one should be brighter.

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30
Q

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

A

The motor would run backwards.

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31
Q

List three types of hand change over switches?

A

Normal / Alternative
Normal / Emergency
Alternative / Emergency

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32
Q

What and where are the 440V earth testing facilities found?

A

Earth indicator light located on the switchboard. Some also have audible alarms.

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33
Q

Why are there separate 115V testing facilities?

A

115v is a transformed supply and the secondary winding (output side) is not physically connected to the primary winding.

34
Q

What does C and C stand for?

A

Control and Communications (switchboard)

35
Q

Define what a converted supply is:

A

A converted supply has its voltage and / or frequency changed from 450V/60Hz.

36
Q

What and where is the earth testing facilities for 24v DC?

A

An earth test panel on the switchboard provides for testing the positive and negative side of the DC supply. A push button with integral lamp is fitted to the switchboard.

37
Q

What does TRU stand for?

A

Transformer Rectifier Unit

38
Q

What does RTR stand for?

A

Rationalised Transformer Rectifier

39
Q

Batteries fall into 2 categories what are they?

A

Primary and Secondary

40
Q

What are the characteristics of the 2 batteries?

A

Primary (dry batteries) are non rechargeable, usually small (used in torches, calculators etc.) and once discharged are thrown away.
Secondary batteries (wet batteries) are rechargeable, requiring specialist recharging equipment and come in varying sizes from small mobile phone batteries to large car batteries or Diesel engine starters and submarine propulsion.

41
Q

What is the capacity of a battery measured in?

A

Batteries are measured in amp-hour (Ah) rate

42
Q

What is the voltage of a fully charged cell?

A

2.1v fully charged

43
Q

What is the Voltage of a discharged cell?

A

1.75v discharged.

44
Q

How many diesel generators are fitted to a type 23 frigate?

A

4 diesel driven generators + one emergency.

45
Q

What is the output of the generators fitted to a type 23?

A

The output is 1.3MW, 600v, 61.2hz 3 phase.

46
Q

Why do we produce 600V from a type 23 generator?

A

A 450V system would not give enough range of speed when using the electrical propulsion system.

47
Q

What are the breakers fitted to a type 23 P&D system?

A
  1. Supply breaker
  2. Inter-connector breaker
  3. Shore supply/ship alongside breaker.
  4. Electric motor breaker.
  5. Motor generator feeder breaker.
  6. Motor generator supply breaker.
  7. Diesel generator alternative supply breaker.
48
Q

What does the converter regulator do?

A

Converter regulator converts and regulates the voltage at 750DC.

49
Q

What is the voltage required for the ships services and how is it produced?

A

The 450v required for ship’s services is generated by a motor generator.

50
Q

What are EDP’s and how many types are fitted to type 23’s?

A

Three types of Electrical Distribution Panel are fitted.

51
Q

What are shedable services and why do we have them?

A

Shedable EDP’s provide power supplies to non-essential equipment.

52
Q

What would happen if we were to lose both motor generators and how is this achieved?

A

The 600V generator can be reconfigured to supply 450V to the 450V system via a 4 position switch at the rear of the switchboard.

53
Q

What services does the emergency switchboard supply?

A
  1. Steering motors
  2. High pressure salt water pumps
  3. Surgery / Sickbay
  4. Smoke clearance exhaust fans.
  5. Portable pump sockets.
54
Q

What are EMACB?

A

Electric Motor Air Circuit Breaker, supplies 600V to the converter regulator.

55
Q

Why is electric propulsion preferred when involved in submarine warfare?

A

To reduce noise, reducing the range at which our ship can be detected and our own interference with the towed array sonar operation.

56
Q

What SRPM and Knots do 2-4 diesel generators produce?

A
  1. 2 generators - 65 SRPM - 8-9 knots.
  2. 3 generators - 80 SRPM - 10-12 knots
  3. 4 generators - 90 SRPM - 14 knots.
57
Q

In the event of action damage to the SCC, how can the propulsion motors be controlled?

A

Propulsion motors can be controlled from Local Control Panels.

58
Q

Describe the cooling system for the propulsion motors?

A

The motor is cooled by water cooled air and circulated through the motor.

59
Q

Describe the normal and emergency cooling system for the converter cubicle?

A

If the heat exchanger fails, 2 emergency inlet panels are removed allowing air to be drawn into the cabinet by the circulating fan.

60
Q

With respect to the type 45 what does IEP stand for ?

A

The Type 45 has an integrated Electric Propulsion System.

61
Q

What are the LV and HV filters used for on the type 45 distribution system?

A

Harmonic filters are used to smooth and filter the voltage supply

62
Q

What is used to cool these filters?

A

These are cooled via a dedicated air to water heat exchanger, form from the ship’s chilled water system.

63
Q

What is the voltage supplied by the main GTA’s on the type 45?

A

The gas turbine alternator produces 4160V, 60 Hz, 3 phase with a capacity of 21MW.

64
Q

What does PMS and EPMS stand for?

A

PMS - Platform Management System and Electrical Power Management System.

65
Q

When are the navigation lights tested and who by?

A

Lights are to be tested daily, one hour before sunset, normally by the duty ET(ME)

66
Q

Whose permission must be gained before switching on the lights aboard ship.

A

OOW / OOD

67
Q

Where are navigation lights controlled from and switched on and off?

A

The Navigation Lights Control Panel (NCLP) is located on the bridge, the Versatile control system is located in the Quartermaster’s console and the VCS 161 is Located in the operations room.

68
Q

List all statutory navigation lights, their colours and location?

A
  1. Side lights = Port (Red), Starboard (Green)
  2. The mast head steaming light Forward and aft (White) and Stern light (White).
69
Q

What is the Not-Under-COMMAND (NUC) lights displayed?

A
  • 2 steady red lights port and two steady red lights starboard, mounted vertically on the mainmast.
70
Q

What is the combination of lights for RAS?

A
  • 2 steady red lights port and starboard.
    -A single white light each side between red lights, vertically mounted on the mainmast.
71
Q

What is the combination of special lights for MOB operations?

A
  • 2 flashing red lights port
  • 2 flashing red lights starboard
    Both vertically mounted on the mainmast.
72
Q

Where are special operations lights switched on from?

A

These are operated by the VCS 428 unit.

73
Q

Describe the anchor light?

A

Fitted on top of the FWD and AFT jack staffs and white in colour.

74
Q

Describe the Masthead Obstruction Lights?

A

Red in colour and mounted port and starboard at the top of the mainmast.

75
Q

How are the emergency navigation lights fed?

A

Emergency navigation lights are fixed in positions adjacent to their normal counter-parts and are supplied via fixed wiring by two series-connected 12 volt batteries.

76
Q

Why is it important to switch on the emergency NUC/RAS lights before being hoisted?

A

If they are hoisted then plugged in an induced current may be present due to radar and radio aerial interference.

77
Q

List the four main components of a fluorescent light fitting.

A
  1. Starter.
  2. Tube
  3. Choke coil
  4. Switched supply
78
Q

In relation to breaker discrimination which safety device will operate first during fault conditions?

A

Moulded Circuit Control Breaker.

79
Q

Defined a converted supply?

A

A supply that has had it’s voltage and or frequency changed.

80
Q

Where can we find the battery’s capacity?

A

Supplied by the manufacturer.

81
Q

What does RTR stand for?

A

Rationalised Transformer Rectifier.

Power And Distribution (1 decks)

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