System Presentation

5/24/2018 System Presentation

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MENUELECTRICAL System presentation 1/41

MENU


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The A320 electrical system looks very much like

electrical systems which you are familiar with. It is simply

more automatic and easier to use.

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GEN 1

GEN 2

GEN 1

There are two engine driven generators.

GEN 2

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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

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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

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TR 2TR 1

GEN 1 GEN 2

IDG 1 IDG 2


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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 2TR 1

IDG 1 IDG 2

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GEN 1 GEN 2

TR 2TR 1

IDG 1 IDG 2



GEN 1 GEN 2

TR 2TR 1

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

BAT 1 BAT 2

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GEN 1 GEN 2

TR 2TR 1

IDG 1 IDG 2

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.

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GEN 1 GEN 2

TR 2TR 1

This is the basic electrical system.

We will now introduce some other components which

supply the basic system.

IDG 1 IDG 2

BAT 1 BAT 2

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GEN 1 GEN 2

TR 2TR 1

The electrical network can also be supplied by the APU

generator.

APU GEN

APU GEN

IDG 1 IDG 2

BAT 1 BAT 2

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GEN 1 GEN 2

TR 2TR 1

These three generators are all identical and any one of

them can supply the entire aircraft electrical needs.

APU GEN

IDG 1 IDG 2

BAT 1 BAT 2

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GEN 1 GEN 2

TR 2TR 1

APU GEN

IDG 1 IDG 2

BAT 1 BAT 2

On the ground, the aircraft can be supplied by an

external power source.

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As a backup, there is a hydraulically driven EMERgency

electrical GENerator (EMER GEN).

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TR 2TR 1

GEN 1 GEN 2

BAT 1 BAT 2

APU GEN

EMER GEN

IDG 1 IDG 2



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.

MENU

TR 2TR 1

GEN 1 GEN 2

BAT 1 BAT 2

APU GEN

EMER GEN

IDG 1 IDG 2



GEN 1 GEN 2

TR 2TR 1

APU GEN

ESS TR

EMER GEN

IDG 1 IDG 2

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.

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GEN 1 GEN 2

TR 2TR 1

APU GEN

ESS TR

EMER GEN

Now, let's see how this information is presented to the

pilots in the cockpit.

We will introduce the ECAM ELEC page.

IDG 1 IDG 2

BAT 1 BAT 2

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GEN 1 GEN 2

TR 2TR 1

APU GEN

ESS TR

EMER GEN

You can see that all the components we have talked

about are displayed on the ECAM page. Notice that each

component has a title to aid identification.

Lets briefly review the basic system using the ECAM

ELEC page.

IDG 1 IDG 2

BAT 1 BAT 2

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GEN 1 and GEN 2 supplying AC bus 1 and AC bus 2.

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TR 1 and TR 2 supplying DC bus 1 and DC bus 2.

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Two essential busses supplied by the left side.

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The DC BAT bus and two batteries.

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For simplification the component indications have been

removed, letsnow present them.

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As shown, each component can be monitored via its

indications.

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MENUELECTRICAL System presentation 29/41MENU

IDG temperature.

frequency ,

current or load for the generators,

These indications are:

voltage,


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You can also notice the different connections displayed

via green lines.

Lets now locate the various controls available to the

pilots and associate them with the components displayed

on the ECAM.

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The ELEC panel is located on

the overhead panel .

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For emergency cases, there is an EMER ELEC

PWR panel on the left side of the overhead panel.

Now lets look at the relationship between the

ELEC panel and the ECAM ELEC page.

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The battery voltage can bemonitored either on the overhead

panel or the ECAM page.

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Each battery is controlled by a pb sw.

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Both main generators and the APU generator

are controlled by their associated pb sw.

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The external power is also controlled by a pb sw.

We will learn how to use it in the Normal

operation modules.

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The AC ESS FEED pb sw enables the pilots to

change the feed for the AC ESS bus from AC bus 1

to AC bus 2.

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The BUS TIE pb sw enables thepilots to isolate one side of the

system from the other. You will

see and do this in the abnormal

operation modules.

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In case of failure, these pb sw enable you to

disconnect an IDG from its drive shaft.

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MENUELECTRICAL System presentation 40/41MENU

The controls and indications on the

EMER ELEC PWR panel will be covered in

the abnormal operation modules.

There is one exception. The EMER GENTEST sw is used by maintenance only to

test the emergency generator.


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In this module, you have seen the electricalconfiguration on ground, with both engines

running and with APU generator and external

power available.

We will introduce you to the different possible

configurations in the next modules.

NEXTMENU

Module completed
http://localhost/var/www/apps/conversion/tmp/Electrical%20vvvv/Elec.%20Normals.ppthttp://localhost/var/www/apps/conversion/tmp/Electrical%20vvvv/Elec.%20Normals.ppthttp://localhost/var/www/apps/conversion/tmp/Electrical%20vvvv/Elec.%20Normals.ppt


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LIST OF SUBJECTS

EXITRETURN

SYSTEM INTRODUCTION

ECAM ELEC PAGE

EMER ELEC PWR PANEL

PANEL LOCATIONS

ELEC PANEL

Documents

System Presentation