Electrical Main Flashcards
DC converter parameters
115 V AC to 28 V DC
What kind of battery
24 V DC NiCad battery
Main purposes of the Battery?
Start the APU and power the Battery utility bus
Main Generator parameters
30-45 kVA AC, 115 V, 3 phase 400 Hz gen, oil cooled
APU Generator parameters
35 kVA AC, 115 V, 3 phase, 400 Hz, air cooled
What do the GCUs do/monitor?
connects the generator to the AC bus, regulates output, protects the system from over/undervoltage, feeder faults, under frequency
What Nr do the GCUs cut the gens off from the system when WOW? (underfrequency protection)
94%
What Nr do the GCUs cut the gens in flight?
Approximately 80% Nr
What Nr is needed for the GCUs to reconnect the generators?
97%
What is Ext Power monitored for?
phase rotation, over/under voltage, over/underfrequency
Ext power sys has a ___ amp circuit breaker that places a ___ amp draw
4,2
What are the AC buses?
1/#2 AC Primary, AC Essential, AC Secondary, AC Monitor
What buses does the #1 Gen normally power?
1 AC Pri, AC Essential, AC Secondary
What buses does the #2 Gen normally power
2 AC Pri, AC Monitor
Three greedy pigs that will always be powered if power is sufficient and buses they are one?
- Back up Hyd Pump on #1 AC Pri
- Mission Avionics on AC Secondary (T/R deice also powered from here)
- Main Rotor Deice on AC Monitor
What happens if any generator is brought online while connected to Ext Power?
Kicks Ext power off
What buses power the DC converters?
1 and #2 AC Primary buses
What 3 buses will the battery power?
Batt Util, Batt, DC Essential
With a ___% charge, normal battery life is good for ___ during the day and ____ at night
80%, 11 min, 9 min
What does the battery analyzer/conditioner do?
Monitors battery system for fault conditions, battery charge, internal temp, cell conditions, and provides battery charging capability
What happens if the analyzer/conditioner detects a fault?
Disconnect DC loads from the battery or secures the battery from the charging circuit as appropriate
What buses are involved in charging the battery?
2 AC Pri powers the charging circuit of the analyzer/conditioner, #2 DC Pri provides the charging power itself
What are the DC buses?
1/#2 DC Primary buses, DC Essential, Battery Bus, Battery Utility Bus
What does the #1 DC converter normally power
1 DC Primary, DC Essential, Battery bus
