P And D 3

Question 1

How many diesel generator are fitted in a type 23

Answer 1

4

Question 2

What is the output for the generators fitted to a type 23

Answer 2

1.3MW, 600V, 61.2Hz, 3 phase

Question 3

Why do we produce such a high voltage by the generators

Answer 3

Because a 450V system would not have given a large enough range of speeds when using the electrical propulsion system

Question 4

What are all the breakers fitted to a type 23 P and D system

Answer 4

Supply breaker 
Interconnector breaker
Shore supply breaker 
Electric motor breaker 
Motor generated feeder breaker 
Motor generated supply breaker 
Diesel generator alternative supply breaker

Question 5

What does the converter regulator do

Answer 5

Converts and regulates the voltage at 750VDC

Question 6

What is the voltage required for the ships services and how is it produced

Answer 6

The 450V required for the ship’s services is generated by a motor generator

Question 7

how many EDP types are fitted to a type 23

Answer 7

Three types of Electrical Distribution Panels are fitted to a type 23

Question 8

What are shedable services and why do we have them

Answer 8

Shedable EDP’s provide power supplies to non-essential equipment

Question 9

What would happen if we were to loose both motor generators and how is this achieved

Answer 9

The 600V generator can be re-configured to supply 450V to the 450V system via a 4 position switch at the rear of the switchboard

Question 10

What services does the emergency switchboard supply to

Answer 10

Steering motor
High pressure salt water pumps 
Surgery/sickbay
Smoke clearance exhaust fans 
Portable pump sockets

Question 11

What are EMACB

Answer 11

Electric Motor Air Circuit Breaker, supplies 600V to the electric propulsion motor

Question 12

Why is electric propulsion preferred when involved in submarine warfare

Answer 12

To reduce noise, reducing the range at which our ship can be detected and our own interference with the towed array sonar operation

Question 13

What SRPM and knots do 2 diesel generator produce

Answer 13

2 generators = 65 SRPM = 8-9 knots

Question 14

What SRPM and knots do 3 generators produce

Answer 14

3 generators = 80 SRPM = 10-12 knots

Question 15

What SRPM and knots do 4 diesel generators produce

Answer 15

4 generators = 90 SRPM = 14 knots

Question 16

In the event of action damage to the SCC, how can the propulsion motors be controlled

Answer 16

Propulsion motors can be controlled from the Local Control Panels (LCP’s)

Question 17

Describe the cooling system for the propulsion motors

Answer 17

The motor is cooled by water cooled air and circulated through the motor

Question 18

Describe the normal and emergency cooling system for the converter cubicle

Answer 18

If the heat exchanger fails, 2 emergency inlet panels are removed allowing air to be drawn into the cabinet by the circulating fan

Question 19

With respect to the type 45 what does IEP stand for

Answer 19

Type 45 has an Integrated Electric Propulsion System (IEP)

Question 20

What are the LV and HV filters used for on the type 45 distribution system

Answer 20

Harmonic filters are used to smooth and filter the voltage supply

Question 21

What is used to cool LV and HV filters

Answer 21

These are cooled via a dedicated air to water heat exchanger, fed from the ship’s chilled water system

Question 22

What is the voltage supplied by the main GTA’s on the type 45

Answer 22

The Gas Turbine Alternator produces 4,160V, 60Hz, 3 phase with a capacity of 21MW

Question 23

What does PMS and EPMS stand for

Answer 23

Platform Management System and Electrical Power Management System