P&D 3

Question 1

How many diesel generators are fitted to a Type 23?

Answer 1

2

Question 2

What is the output of the generators fitted to a Type 23? And why do we produce such a voltage?

Answer 2

•Diesel generators -
1.3MW, 600V, 61.2Hz, 3 Phase.
•Because a 450V AC system wouldn’t have given a large enough range of speeds when using the electrical propulsion system.

Question 3

What are the breakers fitted to a Type 23 P&D system?

Answer 3

•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.

Question 4

What does the converter regulator do?

Answer 4

It converts the voltage from 600v AV and to 750v DC.

Question 5

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

Answer 5

The 450v required by the shop is generated by a motor generator, which is powered by the 600v bus bar through a motor generator feeder breaker.

Question 6

What are EDP’s, and how many types are fitted?

Answer 6

EDP means electrical distribution panel, and there are 3 types fitted:

•Type 1
•Type 2
•Type 3

Question 7

What are sheddable services, and why do we have them?

Answer 7

Sheddable services are non-essential equipment that are run off sheddable EDP’s that can be tripped from the SCC to reduce the motor generator demand on the 650v generators, thus increasing the power available to the propulsion system.

Question 8

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

Answer 8

If we were to lose both generators, we would need to re-configure a 600v generator as a 450v generator to supply the 450v system. This would be achieved via a 4 position switch at the rear of the switchboard.

Question 9

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

Question 9

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

Question 9

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

Question 10

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

Question 11

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

Question 12

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

Question 12

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

Question 12

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

Question 13

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

Question 13

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

Question 14

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

Question 14

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

Question 15

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

Question 16

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

Question 17

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

Question 18

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

Question 18

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

Question 19

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

Question 19

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

Question 20

What services does the Emergency Switchboard supply?

Answer 20

•Steering motors.
•High pressure salt water pumps (HPSW)
•Portable pump sockets.
•Surgery/ sickbay supplies.
•Smoke clearance exhaust fans.

Question 21

What are EMACB?

Answer 21

Electric Motor Air Circuit Breaker