P And D 3 Flashcards
How many diesel generator are fitted in a type 23
4
What is the output for the generators fitted to a type 23
1.3MW, 600V, 61.2Hz, 3 phase
Why do we produce such a high voltage by the generators
Because a 450V system would not have given a large enough range of speeds when using the electrical propulsion system
What are all the breakers fitted to a type 23 P and D system
Supply breaker Interconnector breaker Shore supply breaker Electric motor breaker Motor generated feeder breaker Motor generated supply breaker Diesel generator alternative supply breaker
What does the converter regulator do
Converts and regulates the voltage at 750VDC
What is the voltage required for the ships services and how is it produced
The 450V required for the ship’s services is generated by a motor generator
how many EDP types are fitted to a type 23
Three types of Electrical Distribution Panels are fitted to a type 23
What are shedable services and why do we have them
Shedable EDP’s provide power supplies to non-essential equipment
What would happen if we were to loose both motor generators and how is this achieved
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
What services does the emergency switchboard supply to
Steering motor High pressure salt water pumps Surgery/sickbay Smoke clearance exhaust fans Portable pump sockets
What are EMACB
Electric Motor Air Circuit Breaker, supplies 600V to the electric propulsion motor
Why is electric propulsion preferred when involved in submarine warfare
To reduce noise, reducing the range at which our ship can be detected and our own interference with the towed array sonar operation
What SRPM and knots do 2 diesel generator produce
2 generators = 65 SRPM = 8-9 knots
What SRPM and knots do 3 generators produce
3 generators = 80 SRPM = 10-12 knots
What SRPM and knots do 4 diesel generators produce
4 generators = 90 SRPM = 14 knots
In the event of action damage to the SCC, how can the propulsion motors be controlled
Propulsion motors can be controlled from the Local Control Panels (LCP’s)
Describe the cooling system for the propulsion motors
The motor is cooled by water cooled air and circulated through the motor
Describe the normal and emergency cooling system for the converter cubicle
If the heat exchanger fails, 2 emergency inlet panels are removed allowing air to be drawn into the cabinet by the circulating fan
With respect to the type 45 what does IEP stand for
Type 45 has an Integrated Electric Propulsion System (IEP)
What are the LV and HV filters used for on the type 45 distribution system
Harmonic filters are used to smooth and filter the voltage supply
What is used to cool LV and HV filters
These are cooled via a dedicated air to water heat exchanger, fed from the ship’s chilled water system
What is the voltage supplied by the main GTA’s on the type 45
The Gas Turbine Alternator produces 4,160V, 60Hz, 3 phase with a capacity of 21MW
What does PMS and EPMS stand for
Platform Management System and Electrical Power Management System
