Electrical Flashcards
Main Generator ratings
30/45 kVA, 115 volt ac, 3 phase, 400 hz
Main driven by___
Accessory modules
Lubrication for main gen
transmission oil
APU Generator ratings
35 kVA, 115 volt ac, 3 phase, 400 hz
Generator control unit functions
Connects each generator to ac bus system
Regulates generator output
Protects against
overvoltage
undervoltage
feeder fault
underfrequencyWOW GCU disconnects main generator from power distribution at____
94% Nr
In flight underfrequency protection disabled and generators remain online until _____
80% Nr
Minimum Nr for GCU to reconnect generators
97% Nr
What can external power provide when its the sole source
Energize the entire system
External power circuit breaker and current draw
4 amp circuit breaker
2 amp draw on the cable, some ships require a load to be sensed in order to apply power
5 AC buses
#1 AC Primary #2 AC Primary AC Essential AC secondary AC Monitor
What happens to external power when either a main or apu is on
Automatically disconnects
No. 1 Generator powers what buses
1 AC primary
AC essential
AC secondary
No. 2 Generator powers what buses
#2 AC primary AC monitor
If APU on with both mains on
APU will not be connected to the AC bus distribution
Major load on No.1 AC Primary
Backup hyd pump
Major load on AC secondary
Mission pwr avionics
Tail rotor deice
Major and only load on AC monitor
Main rotor Deice
Buses powered with only APU
#1 AC primary #2 AC primary AC Essential
Only One Gen and APU with bakcup and mission pwr on
AC Monitor will not be powered
Only one Gen
AC SEC and AC MON will not be powered
Number of converters and power supply
2 converters, 28 Vdc
Power to converters from
1/2 AC primary bus
Power of battery, composition
24 Vdc
Nickel-cadmium
Battery, primary source of power for?
APU start
Battery, secondary source for
DC essential and battery bus
Battery life with 80% charge
11 minutes day
9 minutes night
Normal operations battery powers?
Battery utility bus
Battery analyzer/conditioner monitoring powered by?
2 AC primary bus
Battery analyzer/conditioner monitors for?
Fault conditions
Battery charge
internal temp
cell conditions
Battery analyzer/conditioner charges battery through?
2 DC primary bus
1 converter powers
1 DC primary
DC essential
battery bus
2 converter powers
2 DC Primary
Single converter failure
Other converter picks up load
Dual converter failure, battery powers
utility bus battery bus (if switch on) DC essential (charge above 35%)
Battery below___ and no other source of power may not have sufficient fire bottle CAD
30%
