Electrics Flashcards
What is the output of the AC and DC systems?
AC - 90kva, 115/200V at 400Hz
DC - 28V
Normal conditions, how does electrical system work?
2 IDGs power their respective AC busses.
AC1 powers AC essential bus.
Each AC bus powers a DC bus through a TR
DC bus 1 powers the DC Essential bus.
IDG1 therefore has approx 10% higher load
What is the Bus Tie?
The bus tie allows power to be transferred between each side of the electrical system.
It allows the APU Gen to power both sides
Abnormal conditions, how is the electrical system powered?
An emergency generator powered by a RAT supplies 5kva AC power to the AC Essential bus.
It also powers the DC Essential bus through the Essential TR (1kva output)
Emergency Gen output?
5kva
When does emergency gen automatically deploy?
When AC bus 1+2 fail
What happens in time between AC bus failure and Emergency generator taking over?
Rat deploys but takes approx 10s
Battery 1 powers AC Essential through Static Invertor
Battery 2 powers DC Essential bus
Electrical limitations?
100% load and 90kva
QRH electrical procedures?
Emer elec systems remaining
Emer elec summary
3 occasions batteries connect to batt bus?
APU battery start
Flight on batteries only
Recharge cycle
3 types of CB?
Monitored - green (ECAM after 1 min)
Unmonitored - black
Cannot be reset - red sleeved (WTB)
AC Bus 1 fail?
AC Essential bus is powered by AC bus 2 via the AC Essential Feed (automatic)
AC Essential powers DC Essential through Essential TR
DC2 powers DC1 through DC Batt Bus
Consequences of a TR 1+2 failure?
Lose DC 1+2
Emer Elec Config?
Loss of AC1+2
Emergency generator powers AC Essential which powers DC Essential through Essential TR.
Only essential systems remain and CM1 has to be PF
Emergency Smoke Config?
Similar to Emer Elec Config but initiated by pilots to isolate electrical smoke.
Differences:
1. Fuel pump stays on in each inner tank so gravity feed not required
2. Expected to return electrics to working condition before landing (reversible)
