T23 Flashcards
How many diesel generators are in a type 23 and where are they?
4
Two in the forward auxiliary machine room
Two in the upper auxiliary machine room
What is the output of the diesel generators on a type 23?
1.3 MW, 600 V, 61.2 Hz, 3 phase
What are the characteristics of the generators in the forward auxiliary machine room?
Double rafted
Acoustically enclosed
What are the characteristics of the generators in the upper auxiliary machine room?
Single raft mounted
Not enclosed
Why is the 450 V system not used?
Wouldn’t have given a large enough range of speed when using the electrical propulsion system.
What 7 breakers are used in the distribution system?
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
What are the voltages of the two bus bars in each switchboard?
600 V
450 V
What is the generator test box used for?
For testing and trials of the main generators.
What is the generator test kit box connected to?
A link box.
What does a link box do?
Connects fwd and aft 600 V bus bars together, connects the main generators to the generator test box.
What is the 600 V supply used for?
For the propulsion system.
In a type 23, where is the ROCOS and where is it operated from?
In the EDP, operated from the SCC.
What are the three types of EDPs in a type 23?
Type 1
Type 2
Type 3
What will type 1 and type 2 EDPs be fitted with?
ACOS or ROCOS
What are the characteristics of a type 3 EDP?
Single input
Multiple circuits feeding off input
Shedable EDP
What does the shedable EDP do?
Allows the power from non essential equipment to be rerouted to the propulsion motor in an emergency.
What sources of 450 V supply are there if the motor generators are lost?
Converted diesel generator
Emergency generator
What is a converted diesel generator?
A 600 V generator that has been re-configured as a 450 V generator.
What 4 positions are on the switch found in the access panel on the switchboard?
440 v generator test
440 v generator
600 v generator
600 v generator test
How is the 600 v generator re-configured to a 440 v generator?
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.
What is the output of an emergency generator on a type 23?
270kW, 450 V, 60 Hz, 3 phase
How is the emergency generator connected to the emergency switchboard?
Via an emergency generator supply breaker.
What does the emergency switchboard do?
Connects 450 V, 60 Hz, 3 phase to essential equipment in an emergency.
What equipment does the emergency switchboard supply?
Steering motors HPSW pumps Surgery/sickbay Smoke clearance exhaust fans Portable pump sockets
What are two reasons why reducing noise produced by the ship is important?
Reduce the range at which the ship can be detected.
Reduce the interference with the towed array sonar operation.
What is used for propulsion in a type 23?
An electric motor.
What are the components of an electric motor system?
Air filter Cooling fans Yoke Compole Main pole Armature Commutator Brush gear Air cooler
What is a LCP?
Local control panels
Where can the propulsion motors be controlled from?
LCPs
What does the converter regulator do?
Converts 600 V AC to 750 V DC
How is the electrical propulsion motor cooled?
By water cooled air (sea water heat exchanger)
Explain how an electrical propulsion motor is cooled?
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.
How is the electrical converted cabinet cooled?
Air is circulated by a fan through a heat exchanger.
What can be done if the heat exchanger on the electrical converter cabinet cooling fails?
2 emergency inlet panels are removed.
This allows air to be drawn into the cabinet by the circulating fan.
What is EMACB?
Electric motor air circuit breaker
What SRPM AND Knots do 2 diesel generators produce?
65 SRPM and 8-9 knots
What SRPM AND Knots do 4 diesel generators produce?
80 SRPM and 10-12 Knots
What SRPM and Knots do 3 diesel generators produce?
80 SRPM and 10-12 Knots
