24 Electrical Power Distribution Flashcards
describe the system architecture of a small engine power distribution system
There is a bus or bus bar that distributes power to all components. Each electrical power consumer is connected to the bus via a circuit breaker.
what is a BTC
bus tie contactor
used to connect to bus bars
what is a GLC
generator line conector
connects generator to bus
what is a BPCU
bus power control unit
will take info from electrical load throughout circuit ensure proper distribution of power. In some cases it will talk to GCU. If there is an overload off the system it will cut off non-essential items.
which principle distribution system is more common for large aircraft?
a) primary ac generation with dc va TR
b) primary dc generation with ac via inverter
a
what are the three types of distribution systems for large, primary ac distribution aircraft?
split-bus system
parallel bus system
split parallel bus system
describe the principle architecture of the split-bus system
two isolated power generators supplying power to thier respective bus lines. If there is a fairlure, they are connected by BTC or the APU Generator can take over for one generator.
what is a major advantage of the split bus system
generators are not connected and do not have to be in sync exactly with phase and frequencies
how common is the split bus system
very common for modern twin engineaircraft
describe the general system architeecture of the parallel bus system
-many generators are connected to a bus as well as to a tie bus. If one cuts out its bus will still be supplied via the tie bus
advantages and disadvantages of the parallel bus system
+: maintains equal load sharing between gemerators
-: gemerators must have intense synchronization of phase and frequency and voltage.
how common is the parallel bus system
older
what is the split parallel system?
combinatin of the two so any combination can be used in parallel or independently.
advantages and disadvantages of split parallel system
allows flexibility in load distribution but also isolation when necessary.
how is dc power supplied in systems with ac primary power
a TR is used of an ac bus for dc loads. In total generator failure, the batteries supply dc loads and an inverter is battery powered to supply essential ac loads.
