Power and Distribution

Question 1

how may diesel generators are fitted to a generic distribution system

Answer 1

4 generators fitted to a ship

Question 2

what does EDC stand for

Answer 2

Electrical Distribution Centre

Question 3

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

Answer 3

4 EDC’s

Question 4

What does MCCB stand for

Answer 4

Moulded case circuit Breaker

Question 5

list 5 main breakers fitted to a generic distribution system

Answer 5

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

Question 6

what is the power book and when is it used

Answer 6

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

Question 7

what is the lighting book and when is it used

Answer 7

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

Question 8

what is the ratio for 440v fuses regarding fuse discrimination

Answer 8

3:1

Question 9

what is the ratio for 115v fuses regarding fuse discrimination

Answer 9

2:1

Question 10

Explain breaker discrimination

Answer 10

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

Question 11

What does MCR stand for

Answer 11

Machinery control room

Question 12

What does PCP And SCP stand for

Answer 12

Primary control position

Secondary control position

Question 13

list the meters fitted to a switchboard generator section

Answer 13

Voltmeter 
Ammeter
KW meter
Frequency meter
syncroscope 
Earth fault indicator

Question 14

Describe the shore connection supply

Answer 14

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.

Question 15

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

Answer 15

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

Question 16

what is used to confirm correct phase rotation with shore supply

Answer 16

right for bright lamp indicator

Question 17

what would happen to a motor if phase rotation is wrong

Answer 17

motor would run backwards

Question 18

list 3 types of hand change over switches

Answer 18

Normal / Alternative
Normal / Emergency
Normal / Alternative / Emergency

Question 19

List 3 types of changer over switches

Answer 19

Hand changer over
Automatic Change over
Remote operated change over

Question 20

What and where are the 440v earth testing facilities found

Answer 20

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

Question 21

Why are there separate 115v testing facilities

Answer 21

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

Question 22

What does C&C stand for

Answer 22

Control and Communication

Question 23

define a converted supply

Answer 23

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

Question 24

What are the voltages used in the C&C switchboard

Answer 24

24volts DC / 115 volts / 400hertz

Question 25

what does TRU stand for

Answer 25

Transformer rectifier Unit

Question 26

what does RTR stand for

Answer 26

Rationalised Transformer Rectifier

Question 27

Batteries fall into 2 categories what are they ?

Answer 27

Primary and secondary

Question 28

what are the characteristics of the 2 batteries

Answer 28

Primary - dry and not rechargeable | Secondary - wet and rechargeable

Question 29

what is the capacity of a battery measured in ?

Answer 29

Amps -hour

Question 30

what is the voltage of a fully charged cell

Answer 30

2.1volts fully charged

Question 31

what Is the voltage of a discharged cell

Answer 31

1.75v discharged

Question 32

how many diesel generators are fitted to a type 23

Answer 32

4

Question 33

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

Answer 33

1.3mw 600volts 61.2hz 3 phase

Question 34

what breakers are fitted to a type 23

Answer 34

``` supply breaker interconnector breaker shore supply / ship alongside electric motor breaker motor generator FEEDER breaker SUPPLY breaker diesel generator alternative supply breaker ```

Question 35

what does the convertor regulator do

Answer 35

regulates the voltage at 750VDC

Question 36

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

Answer 36

450v and is generated by a motor generator

Question 37

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

Answer 37

Electric distribution panel and 3 types fitted

Question 38

what are shedable services and why do we have them

Answer 38

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

Question 39

what services does the emergency switchboard supply

Answer 39

``` Sickbay steering motors high pressure salt water pumps portable pump sockets smoke clearance exhaust fans ```

Question 40

what does EMACB

Answer 40

Electric motor Air Circuit Breaker

Question 41

why is electric propulsion preferred when involved in submarine warfare

Answer 41

to reduce noise

Question 42

what SPRM and knots do 2 diesel generators produce

Answer 42

65 SPRM =8-9knots

Question 43

what SPRM and knots do 3 diesel generators produce

Answer 43

80-SRPM = 10-12knots

Question 44

what SPRM and knots do 4 diesel generators produce

Answer 44

90 SPRM - 14knots

Question 45

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

Answer 45

form the LCP local control Panels

Question 46

describe the cooling system for the propulsion motors

Answer 46

water cooled air circulated through the motor

Question 47

Describe the emergency cooling system for the converter cubicle

Answer 47

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

Question 48

what does IEP stand for (type 45)

Answer 48

Intergrated Electrical Propulsion

Question 49

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

Answer 49

Harmonic filters used to smooth and filter voltage supply

Question 50

what is used to cool the harmonic filters

Answer 50

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

Question 51

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

Answer 51

4,160v 60hz. 3 phase 21Mw

Question 52

what does PMS and EPMS stand for

Answer 52

platform management system | electrical power management system

Question 53

when are the navigation lights tested and who by ?

Answer 53

1hr before sunset and by the ET (ME)

Question 54

whose permission must be gained first Testing lights

Answer 54

officer of the watch or officer of the day

Question 55

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

Answer 55

NLCP located on the bridge . VCS 428 VCS 161

Question 56

list all statutory navigation lights their colours and location

Answer 56

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

Question 57

list the special operation lights ?

Answer 57

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

Question 58

where are the special operation lights switched on from

Answer 58

VCS-428

Question 59

list 4 main components of a fluorescent light fitting

Answer 59

starter tube choke coil switched