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ELECTRICAL MENU Normal operation (B) 42/41
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EXIT
AUDIO GLOSSARY FCOM
RETURN
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ELECTRICAL MENU System presentation 1/41
ELECTRICAL MENU
System presentation 2/41
The A320 electrical system looks very much like
electrical systems which you are familiar with. It is simply
more automatic and easier to use.
ELECTRICAL MENU
System presentation 3/41
GEN 1 GEN 2
GEN 1
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GEN 2
ELECTRICAL MENU
System presentation 4/41
GEN 1
The generators maintain a constant speed by a drive
mechanism known as an Integrated Drive Generator (IDG).
GEN 2
IDG 1 IDG 2
ELECTRICAL MENU
System presentation 5/41
Each generator supplies Alternating Current (AC) to its
own bus:
• Generator 1 to AC bus 1,
• Generator 2 to AC bus 2.
GEN 1 GEN 2
IDG 1 IDG 2
AC 1 AC 2
ELECTRICAL MENU System presentation 6/41
AC 1 AC 2
TR 1 TR 2
GEN 1 GEN 2
IDG 1 IDG 2
ELECTRICAL MENU
System presentation 7/41
AC 1 AC 2
Each AC bus supplies its own Transformer Rectifier
(TR):
• AC bus 1 to TR 1,
• AC bus 2 to TR 2.
The TR convert alternating current into direct current
(DC) to supply their associated DC buses, DC 1 and DC 2.
GEN 1 GEN 2
TR 1 TR 2
IDG 1 IDG 2
DC 1 DC 2
ELECTRICAL MENU System presentation 8/41
AC 1 AC 2
GEN 1 GEN 2
TR 1 TR 2
IDG 1 IDG 2
DC 1 DC 2
DC BAT
ELECTRICAL MENU
System presentation 9/41
AC 1 AC 2
GEN 1 GEN 2
TR 1 TR 2
DC bus 1 then, feeds the DC BAT bus (DC BAT).
The DC battery bus can charge the batteries or receive
power from the batteries, as required. This will be
explained further in Normal operation.
IDG 1 IDG 2
DC 1 DC 2
DC BAT
BAT 1 BAT 2
ELECTRICAL MENU
System presentation 10/41
AC 1 AC ESS AC 2
GEN 1 GEN 2
TR 1 TR 2
DC ESS
IDG 1 IDG 2
DC 1 DC 2
DC BAT
BAT 1 BAT 2
The electrical system also includes two essential buses.
The first one is the AC ESS bus fed by AC bus 1 and the
second one is the DC ESS bus fed by DC bus 1.
ELECTRICAL MENU
System presentation 11/41
AC 1 AC ESS AC 2
DC ESS
GEN 1 GEN 2
TR 1 TR 2
This is the basic electrical system.
We will now introduce some other components which
supply the basic system.
IDG 1 IDG 2
DC 1 DC 2
DC BAT
BAT 1 BAT 2
ELECTRICAL MENU
System presentation 12/41
AC 1 AC ESS AC 2
DC ESS
GEN 1 GEN 2
TR 1 TR 2
The electrical network can also be supplied by the APU
generator.
APU GEN
APU GEN
IDG 1 IDG 2
DC 1 DC 2
DC BAT
BAT 1 BAT 2
ELECTRICAL MENU
System presentation 13/41
AC 1 AC ESS AC 2
DC ESS
GEN 1 GEN 2
TR 1 TR 2
These three generators are all identical and any one of
them can supply the entire aircraft electrical needs.
APU GEN
IDG 1 IDG 2
DC 1 DC 2
DC BAT
BAT 1 BAT 2
ELECTRICAL MENU
System presentation 14/41
DC ESS
AC 1 AC ESS AC 2
GEN 1 GEN 2
TR 1 TR 2
APU GEN
IDG 1 IDG 2
DC 1 DC 2
DC BAT
BAT 1 BAT 2
On the ground, the aircraft can be supplied by an
external power source.
ELECTRICAL MENU
System presentation 15/41
As a backup, there is a hydraulically driven EMERgency
electrical GENerator (EMER GEN).
AC 1 AC ESS AC 2
TR 1 TR 2
DC 1 DC ESS DC 2
GEN 1 GEN 2
DC BAT
BAT 1 BAT 2
APU GEN
EMER GEN
IDG 1 IDG 2
ELECTRICAL MENU
System presentation 16/41
The hydraulic power to drive the EMER GEN is provided
by a Ram Air Turbine (RAT) located in the belly fairing
which extends in case of severe electrical or hydraulic
failures.
AC 1 AC ESS AC 2
TR 1 TR 2
DC 1 DC ESS DC 2
GEN 1 GEN 2
DC BAT
BAT 1 BAT 2
APU GEN
EMER GEN
IDG 1 IDG 2
ELECTRICAL MENU
System presentation 17/41
DC ESS
AC 1 AC ESS AC 2
GEN 1 GEN 2
TR 1 TR 2
APU GEN
ESS TR
EMER GEN
IDG 1 IDG 2
DC 1 DC 2
DC BAT
BAT 1 BAT 2
The electrical system is also fitted with an ESSential
Transformer Rectifier (ESS TR).
We will see the EMER GEN and the ESS TR in detail in
the Abnormal operation module.
ELECTRICAL MENU
System presentation 18/41
　
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