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Power & Distribution > T23 > Flashcards

T23 Flashcards

1
Q

How many diesel generators are in a type 23 and where are they?

A

4
Two in the forward auxiliary machine room
Two in the upper auxiliary machine room

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2
Q

What is the output of the diesel generators on a type 23?

A

1.3 MW, 600 V, 61.2 Hz, 3 phase

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3
Q

What are the characteristics of the generators in the forward auxiliary machine room?

A

Double rafted

Acoustically enclosed

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4
Q

What are the characteristics of the generators in the upper auxiliary machine room?

A

Single raft mounted

Not enclosed

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5
Q

Why is the 450 V system not used?

A

Wouldn’t have given a large enough range of speed when using the electrical propulsion system.

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6
Q

What 7 breakers are used in the distribution system?

A 
Supply breaker
Interconnector breaker
Shore supply/ship alongside breaker
Electric motor breaker
Motor generator feeder breaker
Motor generator supply breaker
Diesel generator alternative supply breaker
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7
Q

What are the voltages of the two bus bars in each switchboard?

A

600 V

450 V

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8
Q

What is the generator test box used for?

A

For testing and trials of the main generators.

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9
Q

What is the generator test kit box connected to?

A

A link box.

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10
Q

What does a link box do?

A

Connects fwd and aft 600 V bus bars together, connects the main generators to the generator test box.

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11
Q

What is the 600 V supply used for?

A

For the propulsion system.

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12
Q

In a type 23, where is the ROCOS and where is it operated from?

A

In the EDP, operated from the SCC.

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13
Q

What are the three types of EDPs in a type 23?

A

Type 1
Type 2
Type 3

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14
Q

What will type 1 and type 2 EDPs be fitted with?

A

ACOS or ROCOS

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15
Q

What are the characteristics of a type 3 EDP?

A

Single input
Multiple circuits feeding off input
Shedable EDP

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16
Q

What does the shedable EDP do?

A

Allows the power from non essential equipment to be rerouted to the propulsion motor in an emergency.

17
Q

What sources of 450 V supply are there if the motor generators are lost?

A

Converted diesel generator

Emergency generator

18
Q

What is a converted diesel generator?

A

A 600 V generator that has been re-configured as a 450 V generator.

19
Q

What 4 positions are on the switch found in the access panel on the switchboard?

A

440 v generator test
440 v generator
600 v generator
600 v generator test

20
Q

How is the 600 v generator re-configured to a 440 v generator?

A

Switch is placed to 440 v generator test position.
Generator output is checked to ensure correct voltage and frequency.
Switch is placed to 440 v generator position.

21
Q

What is the output of an emergency generator on a type 23?

A

270kW, 450 V, 60 Hz, 3 phase

22
Q

How is the emergency generator connected to the emergency switchboard?

A

Via an emergency generator supply breaker.

23
Q

What does the emergency switchboard do?

A

Connects 450 V, 60 Hz, 3 phase to essential equipment in an emergency.

24
Q

What equipment does the emergency switchboard supply?

A 
Steering motors
HPSW pumps
Surgery/sickbay
Smoke clearance exhaust fans
Portable pump sockets
25
Q

What are two reasons why reducing noise produced by the ship is important?

A

Reduce the range at which the ship can be detected.

Reduce the interference with the towed array sonar operation.

26
Q

What is used for propulsion in a type 23?

A

An electric motor.

27
Q

What are the components of an electric motor system?

A 
Air filter
Cooling fans
Yoke
Compole
Main pole
Armature
Commutator 
Brush gear
Air cooler
28
Q

What is a LCP?

A

Local control panels

29
Q

Where can the propulsion motors be controlled from?

A

LCPs

30
Q

What does the converter regulator do?

A

Converts 600 V AC to 750 V DC

31
Q

How is the electrical propulsion motor cooled?

A

By water cooled air (sea water heat exchanger)

32
Q

Explain how an electrical propulsion motor is cooled?

A

Cool air is drawn through a filter into the motor, by two forced ventilation fans.
Air is then forced over the main poles, armature, commutator and brush gear.
The cool air absorbs the hear generated in the motor.
It is exhausted from the motor at the commutator end.
The air is then forced through a water cooled hear exchanger into the engine room.

33
Q

How is the electrical converted cabinet cooled?

A

Air is circulated by a fan through a heat exchanger.

34
Q

What can be done if the heat exchanger on the electrical converter cabinet cooling fails?

A

2 emergency inlet panels are removed.

This allows air to be drawn into the cabinet by the circulating fan.

35
Q

What is EMACB?

A

Electric motor air circuit breaker

36
Q

What SRPM AND Knots do 2 diesel generators produce?

A

65 SRPM and 8-9 knots

37
Q

What SRPM AND Knots do 4 diesel generators produce?

A

80 SRPM and 10-12 Knots

38
Q

What SRPM and Knots do 3 diesel generators produce?

A

80 SRPM and 10-12 Knots

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