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Power and Distribution > Power and Distribution > Flashcards

Power and Distribution Flashcards

1
Q

how may diesel generators are fitted to a generic distribution system

A

4 generators fitted to a ship

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2
Q

what does EDC stand for

A

Electrical Distribution Centre

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3
Q

How many EDC’s are fitted to a generic distribution system

A

4 EDC’s

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4
Q

What does MCCB stand for

A

Moulded case circuit Breaker

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5
Q

list 5 main breakers fitted to a generic distribution system

A

shore supply / ship along side breaker/ bus bar linking breaker/ feeder breaker/ interconnected breaker/ supply breaker

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6
Q

what is the power book and when is it used

A

power book shows distribution of all 440volts services used when tracing

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7
Q

what is the lighting book and when is it used

A

supply between 115-230volts and used the same as the power book

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8
Q

what is the ratio for 440v fuses regarding fuse discrimination

A

3:1

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9
Q

what is the ratio for 115v fuses regarding fuse discrimination

A

2:1

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10
Q

Explain breaker discrimination

A

is the stages of trips as you wouldn’t want a kettle to trip a main generator you would want a low trip to go 1st

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11
Q

What does MCR stand for

A

Machinery control room

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12
Q

What does PCP And SCP stand for

A

Primary control position

Secondary control position

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13
Q

list the meters fitted to a switchboard generator section

A 
Voltmeter 
Ammeter
KW meter
Frequency meter
syncroscope 
Earth fault indicator
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14
Q

Describe the shore connection supply

A

request shore supply 24hrs before
raise a permit to work
rack out shore supply breakers
obtain castle key from dockyard
continuity non contact and insulation resistance tests carried out on shore cables.
cables brought onboard and secured sufficient slack to allow tide rise
connect shore supply and ensure correct phase connection
inform dockyard ready for power.

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15
Q

what are the rules regarding to earthing the ship when connecting to shore supply

A

the ship must always be earthed to either the jetty or to the ship alongside by at least 2 points no less than half the ships length apart

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16
Q

what is used to confirm correct phase rotation with shore supply

A

right for bright lamp indicator

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17
Q

what would happen to a motor if phase rotation is wrong

A

motor would run backwards

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18
Q

list 3 types of hand change over switches

A

Normal / Alternative
Normal / Emergency
Normal / Alternative / Emergency

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19
Q

List 3 types of changer over switches

A

Hand changer over
Automatic Change over
Remote operated change over

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20
Q

What and where are the 440v earth testing facilities found

A

Earth indicator light / located on the switchboard some have audio alarms

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21
Q

Why are there separate 115v testing facilities

A

115v is a transformed supply and the secondary winding is not physically connected to the primary winding

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22
Q

What does C&C stand for

A

Control and Communication

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23
Q

define a converted supply

A

a converted supply has its voltage and or frequency changed from 450v 60hz

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24
Q

What are the voltages used in the C&C switchboard

A

24volts DC / 115 volts / 400hertz

25
Q

what does TRU stand for

A

Transformer rectifier Unit

26
Q

what does RTR stand for

A

Rationalised Transformer Rectifier

27
Q

Batteries fall into 2 categories what are they ?

A

Primary and secondary

28
Q

what are the characteristics of the 2 batteries

A

Primary - dry and not rechargeable

Secondary - wet and rechargeable

29
Q

what is the capacity of a battery measured in ?

A

Amps -hour

30
Q

what is the voltage of a fully charged cell

A

2.1volts fully charged

31
Q

what Is the voltage of a discharged cell

A

1.75v discharged

32
Q

how many diesel generators are fitted to a type 23

A

4

33
Q

what is the output of the generators fitted to a type 23

A

1.3mw 600volts 61.2hz 3 phase

34
Q

what breakers are fitted to a type 23

A 
supply breaker
interconnector breaker
shore supply / ship alongside 
electric motor breaker 
motor generator FEEDER breaker
SUPPLY breaker
diesel generator alternative supply breaker
35
Q

what does the convertor regulator do

A

regulates the voltage at 750VDC

36
Q

what is the voltage required for the ships services and how it is produced.

A

450v and is generated by a motor generator

37
Q

what does EDP stand for and how many are fitted to a type 23

A

Electric distribution panel and 3 types fitted

38
Q

what are shedable services and why do we have them

A

a shedable EDP’s provide power supplies to non essential equipment

39
Q

what services does the emergency switchboard supply

A 
Sickbay
steering motors 
high pressure salt water pumps
portable pump sockets
smoke clearance exhaust fans
40
Q

what does EMACB

A

Electric motor Air Circuit Breaker

41
Q

why is electric propulsion preferred when involved in submarine warfare

A

to reduce noise

42
Q

what SPRM and knots do 2 diesel generators produce

A

65 SPRM =8-9knots

43
Q

what SPRM and knots do 3 diesel generators produce

A

80-SRPM = 10-12knots

44
Q

what SPRM and knots do 4 diesel generators produce

A

90 SPRM - 14knots

45
Q

in the event of damage to the SCC how can the propulsion motors be controlled

A

form the LCP local control Panels

46
Q

describe the cooling system for the propulsion motors

A

water cooled air circulated through the motor

47
Q

Describe the emergency cooling system for the converter cubicle

A

if the heat exchanger fails the x2 panels can be removed allowing air to be drawn into the cabinet

48
Q

what does IEP stand for (type 45)

A

Intergrated Electrical Propulsion

49
Q

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

A

Harmonic filters used to smooth and filter voltage supply

50
Q

what is used to cool the harmonic filters

A

dedicated air to water heat exchanger fed from the ships chilled water system

51
Q

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

A

4,160v 60hz. 3 phase 21Mw

52
Q

what does PMS and EPMS stand for

A

platform management system

electrical power management system

53
Q

when are the navigation lights tested and who by ?

A

1hr before sunset and by the ET (ME)

54
Q

whose permission must be gained first Testing lights

A

officer of the watch or officer of the day

55
Q

where are the navigation lights controlled from and switched on and off ?

A

NLCP located on the bridge .
VCS 428
VCS 161

56
Q

list all statutory navigation lights their colours and location

A

side lights- port - red
starboard - green
mast head steaming light forward and aft White and stern

57
Q

list the special operation lights ?

A

NUC- not under command 2 steady port 2 steady starboard RED
RAS - replenishment at sea- 2 steady port and starboard Red with white between them
MOB man overboard 2 flashing port and starboard RED

58
Q

where are the special operation lights switched on from

A

VCS-428

59
Q

list 4 main components of a fluorescent light fitting

A

starter
tube
choke coil
switched

Power and Distribution (1 decks)

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