P n D Flashcards
5 switchboard meters
Voltmeter
Frequency meter
Watt meter
Ammeter
Syncroscope
What are fitted to edc
Mccb
450v each faults indicate automatically why is this not possible with 115 v
Because there’s an air gaps within the transformers
Describe breaker discrimination
The fuse or breaker closest to the to the equipment will fail first to protect the power source
6 switchboard indicator lights
Control available/not available,
generator running,
fire detected,
over temperature,
breaker trip
earth fault
What does RTR n TRU
Rationalised transformer rectifier
Transformer rectifier unit
Output from type 23gen
1.3MW 600v 61.2hertz and 3 phase
What is the 440v supply book
Power book
What is the 115/230 v book
Portable apparatus book
What is the fittings and equipment book called
Reference book
What is pcp and what can be operated from it
Primary control position
Main breakers
Generator voltages
Anti condescension
Presence of an earth is indicated in what 2 ways
Indicator light
Audible alarm
Two types of batteries
Primary and secondary
What is the characteristic of the primary batteries
Not rechargeable and once discharged they are thrown away
9 steps to bring on shore supply
Send signal to port
Raise permit to work
Rack out breakers
Prove box is dead
Obtain castle key
Test shore supply cables
Bring on and secure cables
Connect cables
Inform dockyard
What is the purpose of earth bonding
To safeguard personnel should equipment casing become live creating a path of least resistance to earth
Characteristics of secondary cell
Rechargeable and require specialist charging equipment
What is a battery capacity measured in
Amps per hour
3 main purposes of C and C
RICE
Diesel engine starts
Compasses
Where is the breaker operating switch and what is it called
Located in pcp and called discrepancy switch
Control and communication switchboard provides
24vdc and emergency supplies 115v and 400 hertz
What is converted supply
A voltage/frequency change from 440v
What is rice
24vdc,115v,400hertz,1 phase
Rules when connecting ashore
Ship must be earthed at 2 points no longer than half the ships length
How to earth at SS
-Earth jetty
-Earth to ship along side
-Gang ways are to be earthed
-at 2 points no less than half the ships length
3 categories of changeover switches
ACOS-automatic
ROSCOS-remote operated
HCOS-hand
All rn ships can
-Receive power from SS
-Receive power from other ship
-provide power to another ship or Shore side
5 meters
Volt meter
Frequency meter
Watt meter
Syncroscope
Ammeter
What is the breaker operating switch
Discrepancy switch located in pcp
What is the reference book
Stores numbers,types of fittings and number of fittings
Requirement for main electrical system
Prime mover
Generator
Switchboard
What is the Earth testing for c and c switchboard
Push button with integral lamp
What is the lighting book
230/115 volts supply
Output of a type 23 gen
1.3mw , 600v ,61.2hertz,3 phase
What is voltage difference between charged and discharged batteries
2.1v charged
1.75 discharged
When are nav lights tested
Tested Daily an hour before sunset
Who’s permission do u need to switch lights
OOD/OOW
How to control nav lights
NLCP-nav lights control panel
Where are the 2 control panels
Bridge-vcs 428
Operation room-vcs 161
What are the stationary nav lights
Side lights-red and green
Mast head steaming light-white
Stern light-white
How are the emergency nav lights powered
Two series connected 12 volt batteries
Special operations
Not under command-NUC
Replenishment at sea-RAS
man overboard-MOB
What must u do before hoisting up emergency lights
Plug them in and switch them on
What are the 2 miscellaneous lights
anchor lights
Masthead obstruction lights
4 components to fluorescent lighting
Starter
Tube
Choke coil
Switched supply
Parts to fluorescence lighting operation(drawing)
Ac supply
Choke
Mercury
Electrode
Starter switch
Phosphor casing
Pins
Argon gas
Parts to type 23 AEL
Base casting
Pcb retaining clip
Battery retaining clip
Battery 2.4 volt
Terminal block
Two types of edp
ROCOS and shedable
Converter regulator does what
Coverts and regulates the voltage at 750vdc
Why do is 600 volts and not 450
450 v would not give a large enough range of speeds when using electrical propulsion
What are the emergency switchboard uses
Steering motors
Hpswp
Sickbay
Smoke clearance exhaust fans
Portable pump sockets
2 gen
3 gen
4 gen
65 srpm
80 srpm
90 srpm
Describe electrical propulsion motor cooling flow
Air is drawn in through cooling fans and goes through air filter n air goes through poles,armature,commutator and brush gear and then goes through air cooler and out to machinery space
Propulsion motors can be controlled from
Local control panel
Where a the two panels for NLCP
Bridge-vcs 428
Operations room-vcs 161
What is a converted supply
A supply Has its voltage and or frequency changed from 440v
Earth testing facility for 24vdc
Integral lamp
Breakers fitted to type 23 p and d system
Interconnector breaker
Supply breaker
Motor generator supply breaker
Motor generator feeder breaker
Electric motor breaker
SS/SA breaker,
alternate supply breaker
What are shedable edps
They provide power supplies to non essential equipment
What would happen if we were to loose both motor generators
Re-configured to 450v and switched at the rear of the switchboard
What does the emergency switchboard supply
Steering motors
HPSWP
sickbay
Scef
Portable pump sockets
What are EMACB
Electric motor air circuit breaker
What are LV and HV filters used for on type 45
Harmonic filters are used to smooth and filter the voltage supply
Voltage supply to type 45 gens
4,160v,60hz,3phase and 21MW
Pms and epms
Platform management system
Electric power management system
Describe cooling system for propulsion motors
Cooled through water cool air and sent around the motor
Describe normal and emergency cooling system for converter cubicle
If heat exchanger fails 2 emergency panels are removed to allow air in
Voltage required for ships service and how is it produced
440v and from motor generator
Why is it important to switch on and plug in emergency lights before hoisting them
If hoisted then plugged in a induced current may be present due to radar and radio interference
Earth testing for 24vdc
Integral lamps
What are edps and how many type are fitted
Electrical distribution panel and 3 types
