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NEI > EPG&D > Flashcards

EPG&D Flashcards

1
Q

Purpose

A

The purpose of the EPG&D system is to produce stable NATO standard electrical power from the ship’s generators or shore power and distribute it to the ship’s systems and services requiring electrical power.

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2
Q

DG’s

A

Caterpillar C32 Diesel Generator

Powered by a 12 cylinder, four-stroke, turbo-charged diesel engine.

Generate NATO standard power for the ship’s switchboards.

Inside raft mounted acoustic enclosures.

1800 rpm.

830 kW

Started by HP air in dedicated flasks, one in FER and one in AER.

Cooled by a plate type heat exchanger which uses ASWC.

DGs can be controlled from MEC or DG LCP.

DG 1 & 2 located in FAMR
DG 3 and 4 located in AAMR

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3
Q

AVRs

A

Automatic Voltage Regulators

Each DG has 2 AVRs.

Automatic control of DC exciter voltage which regulates generator output voltage.

One is active, one on standby.

Will automatically change over to standby if primary fails.

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4
Q

Switchboards

A

2 switchboards distribute power from DGs or shore to various users.

5 ACB’s
55 MCCBs

Can be operated in Split operation (bus ties open) or Parallel (one or both bus ties closed.

Located in Fwd and Aft Switchboard Rooms

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5
Q

Switchboard Modes (List)

A

Automatic
Manual Permissive
Manual

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6
Q

Automatic (SWBD Mode)

A

DGs started and paralleled automatically.

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7
Q

Manual Permissive (SWBD Mode)

A

Parallelling done manually using the synchroscope.

Safeties protect the plant if paralleling is done incorrectly.

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8
Q

Manual (SWBD Mode)

A

Paralleling is done manually using the snychroscope.

No safeties are in place.

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9
Q

What is paralleling?

A

Synonym with “Synchronizing”

Adjusting the voltage, frequency, and phase of the DG to match with the other DGs.

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10
Q

EPCS

A

Electrical Power Control System

Responsible for monitoring and controlling the EPG&D system.

ESCs are in RTU 10 and 11 and communicate with eachother via IPMS LAN.

IF ESCs cannot communicate, they open bus ties and operate independantly.

CONSOLE CONTROL: Switchboard operated via IPMS.

SWITCHBOARD CONTROL: Switchboard controlled locally at the switchboard itself.

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11
Q

List ESC Functions

A

Load Sharing
Load Sheding
Preference Tripping
ACB Interlock
Blockout Sequence
Voltage Adjust
Automatic Synchronization

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12
Q

Load Sharing

A

Automatically adjusting the frequency of online DGs so that each DG shares an equal amount of load.

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13
Q

Load Shedding

A

When a sudden electrical load >110% rated load for the number of online generators, load shed breakers are tripped.

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14
Q

Preference Tripping

A

Same as load shedding but only when 1 DG is running and demand >150%.

Helps ensure we do not black out by allowing higher percentage before breakers trip.

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15
Q

ACB Interlock

A

Ensures only designed bus tie configurations occur.

1 DGs: 0,1,2
2 DGs: 0,1,2
3 DGs: 0,1
4 DGs: 0

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16
Q

Blackout Sequence

A

Ensures power to switchboards is quickly re-established if it is lost.

<22 volts sensed at bus bars of both switchboards:

All bus ties open
All DG ACBs open
All DGs start
First DG online will be loaded
All other DGs synch to that one

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17
Q

Voltage Adjust

A

Automatically synchronizes DGs with shore power.

If shore power >465 V, must be done manually.

18
Q

Automatic Synchronization

A

Automatically allows sources to be tied together while ensuring synchronization.

19
Q

Explain Generation Theory

A

3 Stators (stationary wire coils)
Rotor driven by diesel engine
2 magnetic pole pairs mounted on the rotor.

Excitation field strength of rotor pole pairs controls voltage.

Stator coils are 120 degrees apart for 3 phase power.

Shaft rotates at 1800 rpm for 60Hz (with 2 magnetic pole pairs)

20
Q

Vital Loads

A

Yellow

Equipment that aids the ship with main propulsion and navigation.

Connected through ACOSs.

MLO pumps
Steering pumps
Gyros
Navigation Lighting

21
Q

Semi-Vital Loads

A

Black

Communications and weapons equipment

Connected to switchboards via MCOSs

22
Q

Direct Feed Non-Vital Loads

A

Red

Large equipment

115 Ton Chillers

Connected to swtichboards via MCCBs.

23
Q

Load Shed Loads

A

Blue and White

Allow automatic load shedding.

Domestic lighting, bulkhead power outlets, galley equipment.

24
Q

ACOS

A

Automatic Change Over Switch

Change over automatically.

25
Q

MCOS

A

Require operator to change over.

Change over performed from IPMS console or locally at MCOS.

26
Q

Secondary Power

A

Produced from NATO Standard Power using transformers, rectifiers, inverters, phase converters, and SFCs

120 V, 60 Hz, 1 phase
120 V, 400 Hz, 3 phase
28 V DC
UPS

27
Q

120V, 60 Hz, 1 Phase

A

Domestic services such as lighting and bulkhead power outlets

28
Q

120 V, 400 Hz, 3 Phase

A

Derived from SFCs

Helo Start Pack
57mm Gun
CEROS
SG-180
SMART-S

29
Q

28 V DC

A

Derived from Static Rectifier Units

Sonar
Missiles
Torpedos

SRUs broken down into:
6x 100 W
4x 500 W
4x 700 W

30
Q

UPS

A

33 UPSs

Supplied with NATO Standard Power

Provide 15 minutes of power

31
Q

Casualty Power

A

Cable connections are run around damaged power distribution lines to supply Vital and Semi-Vital loads.

400 A Cables are red, white, and black and have tailored connection points so crossing of phases does not occur.

100 A cables also exist.

Cables are pre-cut lengths.

Cables connect to bulkhead and deckhead jumper stations.

Cables are run from load to source and must be authorized by Command to energize.

32
Q

Modes of Operation (List)

A

Harbour State:
Home Port
Foreign Port

Normal Peacetime Cruising
Action State
Abnormal State

33
Q

Harbour State: Home Port

A

DGs ON: 0
DGs Standby: 1
Bus Ties: 1,2
Mode: Manual Permissive

34
Q

Harbour State: Foreign Port

A

DGs ON: 1
DGs Standby: 1
Bus Ties: 1,2
Mode: Auto Synch

35
Q

Normal Peacetime Cruising

A

DGs ON: 2
DGs Standby: 1
Bus Ties: 2
Mode: Auto Synch

36
Q

Action State

A

Maximum Suriviability

DGs ON: 4
DGs Standby: 0
Bus Ties: 0
Mode: Auto Synch

37
Q

Abnormal State

A

Any other configuration.

May occur due to power export to other ships.

38
Q

System Interfaces

A

FOS
HP Air
ASWC
IPMS

39
Q

Redundancy and Survivability

A

Only 2 DGs required to provide power

Geographically distributed fwd and aft

Switchboards can function in solation

Switchboards operated in REMOTE and SWITCHBOARD control

Vital, Semi-Vital, Non-Vital loads

ACOS, MCOS

UPS

40
Q

Y

A

Y

NEI (15 decks)

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