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What subsystems is the electrical system comprised of?
The electrical system is comprised of AC electrical system, DC electrical system and STANDBY system.
What are the sources of the AC electrical power?
- Left engine-driven generator
- Right engine-driven generator
- APU starter-generator
- External power
What is the primary source of the DC electrical power?
Three transformer rectifier units (TRUs). They change 115v ac to 28v dc.
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What is the alternate source of the electrical power?
Main battery
What are the normal sources of power for the AC system?
EDGs
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What supplies the generator buses number 1 and 2?
The engine driven generator #1 supplies generator bus #1, whereas
the engine driven generator #2 supplies generator bus #2.
What helps engine-driven generators to rotate at a constant speed?
A constant speed drive (CSD)
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What is the function of the generator control unit or GCU?
GCU monitors the output of the engine driven generator. The GCU will allow the generator to connect to the electrical system only if the generator output both voltage and frequency are within limits.
How many power sources can be connected connected to a power bus at a time?
Only one power source can be connected to a power bus at any given time.
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How many generator buses can the APU power on the ground?
The APU can power both generator buses at the same time
How many generator buses can the APU power in flight?
In flight the APU can only power one generator bus up to a certain altitude.
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What's the difference between the APU generator and the engine driven generator.
The APU generator is similar to the engine driven generator except that there is no CSD mechanism.
What's the function of the transfer bus?
Each transfer bus supplies power to a transformer rectifier unit (TRU).
Within what time can a fully charged battery power the essential equipment?
The fully charged battery provides power the essential equipment at least for 30 minutes.
What maintains the battery charge?
The battery charger makes sure its battery stays at maximum charge.
What powers the AC and DC standby buses?
The AC standby bus is powered by the transfer bus 1, the DC standby bus is powered by the DC bus 1.
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What's the backup power source for the standby AC and DC buses?
The backup power source for the standby AC and DC buses is the battery bus.
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Through what does the AC standby bus receive power from the battery bus?
The AC standby bus receives power from the battery bus through the static inverter.