Airbus A320 Electrics Flashcards
What are the specifications of the DC System?
28 Volts
What are the ratings of the Engine & APU Driven Gens and the Emergency Gen?
Engine & APU Driven : 90 kVA
Emergency Generator : 5 kVA
How is the Emergency Generator driven?
By the Blue Hydraulic System.
How is constant frequency obtained from the Engine & APU Driven Generators?
IDGs : Integrated (Constant Speed) Drive Units
APU : Constant Speed APU
The Static Inverter can supply the AC ESS Busbar.
What is its Source & what does it supply?
Source : Battery 1
Supplies : (part of) the AC ESS Bus
When will the Static Inverter be Energised from the Battery even if the Battery Switch is OFF?
If Aircraft speed exceeds 50 kts AND the only source of power is the Batteries,
Battery 1 will supply the Static Inverter irrespective of Battery p/b position.
How many TRs are there?
3
How many amps can a TR supply?
200 Amps
In Normal Operations which TRs are in use?
TR1 and TR2 only.
How many batteries are there?
2
What is a BCL?
Battery Charge Limiter
What do the following colours on Cb collars mean:
- Green
- Black
- Red
- Yellow?
Green - Monitored by ECAM
Black - Not ECAM Monitored
Red - Must not be pulled
Yellow - may be pulled when on batteries only (Early A320 only.)
At any one time there my be 4 main sources of AC Power available :
- GEN1, GEN2, APU GEN & EXT PWR.
What is the order of Preference of Supply?
To either AC Bus,
- Onside GEN, then
- EXT PWR (if EXT PWR p/b pressed), then
- APU, finally
- Offside GEN.
Can any of the electrical sources be connected in parallel?
NO.
The Bus Ties will prevent this.
In Normal Operations, which AC Busbars are supplied by GEN1 and GEN2?
GEN1: AC1 and through AC1 the ESS AC.
GEN2 : AC2
In Normal Operations, how are the TRs supplied?
TR1 supplied from AC1
TR2 supplied from AC2
ESS TR is not in use.
In Normal Operations what do the TRs supply?
TR1 supplies : DC Bus 1, Battery Bus (through DC1) and ESS DC (through Battery Bus)
TR2 supplies : DC Bus 2
ESS TR supplies : nothing
In Normal Operations, what do the Batteries supply?
Just the Hot Battery Busbars.
What is the Normal Source of supply of the “Battery” Busbar?
TR1
When the AC and DC GROUND/FLIGHT busses are being supplied directly from EXT PWR, does EXT PWR also power the rest of the aircraft Electrical System?
&
What component of the Electrical System is also required to enable DC GROUND/FLIGHT to be energised?
NO
&
TR2
In Normal Operations are the AC and DC GROUND/FLIGHT busses powered and if so from what source?
YES
AC from AC2
DC from DC BUS 2
If GEN1 or GEN2 fails in flight, what pilot action is required to ensure that Supplies are maintained to the Electrical System?
None.
The opposite generator, or the APU Gen will replace the failed generator automatically.
If AC1 Fails, what pilot action is required to regain supply to it?
If it does not automatically recover, Use the AC ESS FEED p/b.
This connects AC ESS to AC2 rather than AC1 and hopefully restores it.
AC BUS 1 normally supplies the AC ESS BUS, and, via the TR1, the DC ESS BUS.
In the case of an AC BUS 1 FAULT, the AC ESS BUS and the DC ESS BUS will automatically recover, due to the fact that the AC BUS 2 will automatically supply the AC ESS BUS.
If AC BUS 2 does not automatically supply the AC ESS BUS, the flight crew can recover the AC ESS BUS and the DC ESS BUS by setting the AC ESS FEED pb-sw to ALTN, as requested by the AC ESS BUS FAULT ECAM procedure.
What are the specifications of the AC System?
3 phase
115/200 Volts
400 Hz
