Day 1 Stuff Flashcards
To learn power and distribution
How many diesel generators are fitted on a normal RN ship?
4
What does EDC stand for?
Electrical distribution centre
How many EDCs are connected to a normal distribution system?
2
What does MCCB stand for?
Molded Case Circuit Breaker
List 5 main breakers and their uses in a generic distribution system?
Supply breaker - allows to isolate the supply in case of an earth
Interconnecting breaker - allows to isolate 2 switchboards from each other
Busbar linking breakers - allows to isolate bus bars from each other
Feeder breakers - allows to isolate the drain from the switchboards
Shore/ship supply breakers - allows to isolate the ship from another ship or from the shore supply
What is the power book?
The power book contains all the 440V supply diagrams to use when circuit tracing to diagnose a problem in the 440V system
What is the low power and lighting book?
The low power and lighting book is used for all 115V systems which contains the lighting system, this is so that you can see where a problem might be
What is the discrimination ratio for 440V?
3:1
What is the discrimination ratio for 115V?
2:1
Explain breaker discrimination?
Breaker discrimination is where the breakers increase in size as you get closer to the supply to accommodate earth faults
What does MCR stand for?
Machinery control room
What does PCP stand for?
Primary control position
What does SCP stand for?
Secondary control position
List the meters fitted to a switchboard generator section
Voltages
Frequency
What meters are on the switchboard?
Voltmeter Frequency meter Power meter Synchroscope Earthfault indicator Ammeter