11.6 Electrical Power Flashcards
How many kilowatts would a train engine aircraft need for flight
100kw
What is used to convert AC to DC
TRU
What is used to convert DC to AC
Static inverter
How much energy can a static inverter produce
2.5 KW
What power is provided by AC
115v 400 hertz
What % of total energy is needed by AC
95%
What voltage does a 24v DC battery provide
28v
What is VFG
Variable Frequency Generator
What 3 parts are power divided into
Main power - All consumers
Essential - Consumers to fly aircraft safely
Emergency - Consumers to land aircraft safely
What is the purpose of a bus
Connect power to all electrical consumers
What does load shedding do
Improves reliability of power relays and prevents overload of power source
What is a GCU
Generator Control Unit
How long does the battery provide sufficient power
30 mins 24v
When is an additional emergency generator needed
Extended range operation
What is the main task of a fuse circuit breaker
Prevent overheat
What do most aircraft generators need an input speed of
12,000 RPM
What frequency does the engine drive the generator between (idle and take off power)
280-560 hertz
What does a constant speed generator do
Keeps a constant frequency of 400 hertz, adds or subtracts speed from the engine
What is used in a constant speed drive to add or subtract speed
A differential gear
What can CSDs also be called
Axial differential gear
How does the CSD add additional speed
Hydraulic motor
How often should battery checks be carried out
Every 2000 operating hours
