Distribution Network General Arrangement

In normal flight configuration each IDG supplies its own distribution
network via its generator line contactor (GLC). The two IDG
s are never
electrically coupled.

The distribution network No. 1 consists of :
- The No. 1 alternating current bus (AC BUS 1).
The alternating current essential bus (AC ESS BUS).
- The alternating current emergency bus (AC EMER BUS).
The distribution network No. 2 corresponds to the alternating current bus
No. 2 (AC BUS 2).

The transformer/rectifiers 1 and 2 supplied by BUSSES 1 and 2 respectively
supply the direct current normal bus (DC NORM BUS) through their respective
contactors.

The essential transformer rectifier supplied from the alternating current
essential bus, supplies the direct current essential bus (DC ESS BUS)
through its contactor.

The direct current normal and essential busses are linked by a tie
contactor (DC BUS TIE).

The distribution network of the standby generator consists of :
- a part of the alternating current essential bus (AC ESS BUS 3XP-2)
- the alternating current emergency bus (AC EMER BUS)
- the direct current essential bus (DC ESS BUS).

The three batteries are associated with the direct current essential bus,
(DC ESS BUS).
In certain failure configurations, the following power supplies are
provided :
-
The alternating current essential bus (AC ESS BUS) and the associated
emergency bus (AC EMER BUS) can be directly supplied via a main generator, upstream of its line contactor and through the corresponding
essential transfer contactor (ETC).

This possibility is mostly used in emergency configuration.
- the alternating current emergency bus (AC EMER BUS) can be supplied :
. either by the standby generator through part of the alternating current
essential bus 3XP-2
. or directly by the static inverter.

These possibilities are mostly used in smoke emergency configuration.