P n D Flashcards by Harry Pennington

5 switchboard meters

Voltmeter
Frequency meter
Watt meter
Ammeter
Syncroscope

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What are fitted to edc

Mccb

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450v each faults indicate automatically why is this not possible with 115 v

Because there’s an air gaps within the transformers

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Describe breaker discrimination

The fuse or breaker closest to the to the equipment will fail first to protect the power source

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6 switchboard indicator lights

Control available/not available,
generator running,
fire detected,
over temperature,
breaker trip
earth fault

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What does RTR n TRU

Rationalised transformer rectifier
Transformer rectifier unit

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Output from type 23gen

1.3MW 600v 61.2hertz and 3 phase

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What is the 440v supply book

Power book

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What is the 115/230 v book

Portable apparatus book

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What is the fittings and equipment book called

Reference book

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What is pcp and what can be operated from it

Primary control position
Main breakers
Generator voltages
Anti condescension

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Presence of an earth is indicated in what 2 ways

Indicator light
Audible alarm

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Two types of batteries

Primary and secondary

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What is the characteristic of the primary batteries

Not rechargeable and once discharged they are thrown away

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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

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What is the purpose of earth bonding

To safeguard personnel should equipment casing become live creating a path of least resistance to earth

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Characteristics of secondary cell

Rechargeable and require specialist charging equipment

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What is a battery capacity measured in

Amps per hour

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3 main purposes of C and C

RICE
Diesel engine starts
Compasses

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Where is the breaker operating switch and what is it called

Located in pcp and called discrepancy switch

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Control and communication switchboard provides

24vdc and emergency supplies 115v and 400 hertz

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What is converted supply

A voltage/frequency change from 440v

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What is rice

24vdc,115v,400hertz,1 phase

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Rules when connecting ashore

Ship must be earthed at 2 points no longer than half the ships length

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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