A380-LEVEL I - ATA 24 Electrical Power

A380TECHNICAL TRAINING MANUAL

MAINTENANCE COURSE - T1 & T2 (RR / Metric)LEVEL I - ATA 24 Electrical Power

This document must be used for training purposes only

Under no circumstances should this document be used as a reference

It will not be updated.

All rights reservedNo part of this manual may be reproduced in any form,

by photostat, microfilm, retrieval system, or any other means,without the prior written permission of AIRBUS S.A.S.

LEVEL I - ATA 24 ELECTRICAL POWERElectrical Power System Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2Electrical System Philosophy Presentation . . . . . . . . . . . . . . . . . . . . 16AC & DC Generation Presentation . . . . . . . . . . . . . . . . . . . . . . . . . . 28Electrical Power System Maintenance (1) . . . . . . . . . . . . . . . . . . . . 54


TABLE OF CONTENTS Mar 21, 2006Page 1

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ELECTRICAL POWER SYSTEM INTRODUCTIONGeneral

The electrical system generates and distributes electrical power to aircraftsystems and can be split into two parts:- The electrical generation system- The electrical distribution system.

Electrical GenerationThe electrical generation is split in four subsystems, which are:- The Alternating Current (AC) normal generation,- The Direct Current (DC) generation,- The APU starting system.- The AC emergency generation and STATic INVerter,

Electrical GenerationThe electrical distribution feeds all aircraft electrical users with ACand DC power through three distribution subsystems:- The primary distribution,- The secondary distribution,- The emergency distribution.


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GENERAL - ELECTRICAL GENERATION & ELECTRICAL GENERATION




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ELECTRICAL POWER SYSTEM INTRODUCTIONElectrical generation

The entire aircraft electrical system is supplied with AC and DC powersources.

AC normal GENERATIONIn normal configuration, the entire AC network can be supplied bythree kinds of power source, which are:- Four Variable Frequency Generators (VFGs),- Or two Auxiliary Power Unit Generators (APU GENs),- Or four Ground Power Units (GPUs).




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ELECTRICAL GENERATION - AC NORMAL GENERATION




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ELECTRICAL POWER SYSTEM INTRODUCTIONElectrical generation (continued)

DC GENERATIONIn normal Configuration, the entire DC network is supplied from theAC network via:- Three Battery Charge Rectifier Units (BCRUs),- And three main BATteries (BATs).In abnormal configuration, part of the DC network can be suppliedfrom the AC network via a Transformer Rectifier (TR).




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ELECTRICAL GENERATION - DC GENERATION




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APU STARTING SYSTEMThe APU needs DC electrical power to start up. The APU startingsystem is a part of the DC network dedicated to the APU starting andis supplied via:- The APU TR,- Or the APU BAT.




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ELECTRICAL GENERATION - APU STARTING SYSTEM




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AC eMERGENCY GENERATION and static inverterIn electrical emergency configuration, the supply of the electricalloads essential for flying is recovered from the electrical Ram AirTurbine (RAT). When no AC power source is available, part of theAC network can be supplied by the STAtic INVerter.




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ELECTRICAL GENERATION - AC EMERGENCY GENERATION AND STATIC INVERTER




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ELECTRICAL POWER SYSTEM INTRODUCTIONELECTRICAL DISTRIBUTION

The electrical distributing system allows distribution of AC and DCelectrical power to the various electrical loads according to the availabilityof the power source. It also performs network protection andreconfiguration. The electrical distributing system is split in 3 subsystems:- A primary distribution done by the Primary Electrical Power DistributionCenter (PEPDC),- A secondary distribution done by the Secondary Electrical PowerDistribution centers (SEPDCs) and the Secondary Power DistributionBoxes (SPDBs),- An emergency distribution released by the Emergency Power Center.




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ELECTRICAL DISTRIBUTION




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ELECTRICAL POWER SYSTEM INTRODUCTIONControl and indicating

The control and indicating of the electrical power system is composedof:- An ELECtrical panel located on the overhead panel,- A BATtery maintenance panel,- An EMERgency ELECtrical PoWeR panel,- An AC ELECtrical ECAM page,- A DC ELECtrical ECAM page.Note that the C/B statuses are presented on the ECAM C/B page.




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CONTROL AND INDICATING




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ELECTRICAL SYSTEM PHILOSOPHY PRESENTATIONGeneral

The basic core functions of the electrical system allow:- To generate electrical power in all aircraft configurations thanks to theelectrical generation system,- And to distribute this electrical power to the aircraft electrical loadsthrough the electrical distribution system.


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GENERAL




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ELECTRICAL SYSTEM PHILOSOPHY PRESENTATIONElectrical Generation

The electrical generation system is split into an Alternating Current (AC)and a Direct Current (DC) generation.

AC GenerationThe AC generation is divided into a normal and an emergencyelectrical generation. It delivers 115 Volts Alternating Current (VAC)associated either to a variable or a fix frequency.Variable Frequency:The variable frequency technology has been chosen to respond toreliability and weight saving requirements related to the four maingenerators called Variable Frequency Generators (VFGs). Note thatthe VFGs can be installed on both engine versions. The emergencygenerator is no longer a Constant Speed Motor / Generator (CSM/G)but a variable frequency Ram Air Turbine (RAT) generator. Note thatthe variable frequency rectification is done inside each system throughtechnologies, which are dependent on the equipment.Fixed Frequency:The fix frequency generation is provided by:- Up to four Ground Power Units (GPUs) and two APU Generators(APU GENs) which are part of the AC normal generation,- The Static Inverter (STAT INV) used when no AC power source isavailable.

DC GenerationDC generation delivers 28 Volts Direct Current (VDC). The DCgeneration is divided into a normal DC generation and a specific APUstarting system. The normal DC generation, which is split into a DCmain, essential and battery generation, is made up of:- Three Battery Charge Rectifier Units (BCRUs),- A Transformer Rectifier (TR),

- And three Batteries.Note that DC ESSential and battery generation is also used in electricalemergency configuration or when no AC power source is available.The APU starting system has a dedicated TR and a dedicated battery.




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ELECTRICAL GENERATION - AC GENERATION & DC GENERATION




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ELECTRICAL SYSTEM PHILOSOPHY PRESENTATIONElectrical Distribution Layout Principle

The electrical distribution system is segregated into:- A main distribution system,- An emergency distribution system.This segregation enables in case of total loss of the normal generation tokeep supplied, through the emergency distribution, the electrical loadsessential to complete flight and to perform a safe landing.The main distribution system is composed of two distribution subsystemsin order to segregate the high power loads supply from the low powerloads supply. These two distribution systems are called:- The primary distribution system,- The secondary distribution system,




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ELECTRICAL DISTRIBUTION LAYOUT PRINCIPLE




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ELECTRICAL SYSTEM PHILOSOPHY PRESENTATIONElectrical Distribution Layout Principle (continued)

Primary DistributionThe primary distribution is done by the Primary Electrical PowerDistribution Center (PEPDC). The PEPDC is split into side 1 and side2 to make a redundant and segregated normal electrical supply. ThePEPDC contains the main electrical network components for powerdistribution, network management, and the associated electricalprotective devices. It manages power transfers from AC and DCgeneration sources to:- The secondary distribution system- The emergency distribution system- And directly to the heavy loads of the aircraft.Notice that the heavy loads are electrical loads consuming above 15A.

Secondary DistributionThe secondary distribution is done by two Secondary Electrical PowerDistribution Centers (SEPDCs) (one for side1 and one for side 2) andeight Secondary Power Distribution Boxes (SPDBs). The SEPDCsand SPDBs contain electrical protective devices.- Six SPDB's are installed in the cabin and transfer electrical powerfrom the PEPDC to the cabin commercial loads. The two other SPDB'sare installed in the lower deck and transfer electrical power fromPEPDC to the cabin and cargo commercial loads.- The two SEPDCs transfer electrical power from PEPDC to technicalloads.Notice that loads powered by the secondary distribution are loadsconsuming less than or 15A maximum.

Emergency DistributionThe emergency distribution is done by the Emergency Power Center.This center contains the emergency electrical network componentsfor power distribution and the associated protective devices. The

emergency distribution transfers AC and DC electrical power fromthe primary distribution to the essential loads. The essential loadskeep the aircraft vital organs supplied in order to fly and land safely.




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ELECTRICAL DISTRIBUTION LAYOUT PRINCIPLE - PRIMARY DISTRIBUTION ... EMERGENCY DISTRIBUTION




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ELECTRICAL SYSTEM PHILOSOPHY PRESENTATIONElectrical Distribution Monitoring and Management

To distribute safely the electrical power, two applications, the CircuitBreaker Monitoring (CBM) application and the Electrical LoadManagement (ELM) application, monitor and manage the entire electricaldistribution network. These applications are hosted in two Core ProcessingInput/Output Modules (CPIOM) dedicated to the electrical system: theCPIOM-E1 and the CPIOM-E2.

CBM ApplicationThe CBM application monitors the status of all different protectivedevices of the aircraft and sends a status message to the cockpit whenany protective device has tripped.

ELM ApplicationThe ELM application makes an optimum use of the electrical loadswithin the limit of the power sources. For that, the ELM applicationreceives the status of all power sources. In case of an overload, itsheds most of the loads through the main and emergency distributionsystems. Electrical loads are reconnected when enough power isavailable on the power sources.




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ELECTRICAL DISTRIBUTION MONITORING AND MANAGEMENT - CBM APPLICATION & ELM APPLICATION




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ELECTRICAL SYSTEM PHILOSOPHY PRESENTATIONPower Distribution Maintenance Interface (PDMI)The Power Distribution Maintenance Interface (PDMI) allows themaintenance crew, monitor and control (open, secure, tag and close) thevarious remote protective devices installed in the PEPDC, the SEPDC,the SPDB and the Emergency Power Center. The PDMI functions areachieved by 2 Power Distribution Maintenance Computers (PDMCs),which communicate with the electrical distribution systems, and by twoPower Distribution Control System (PDCS) applications hosted in theOnboard Maintenance System (OMS). These applications receiveinformation from the active PDMC and display the status of the variousmonitored protective devices on the Onboard Maintenance Terminal(OMT), On-board Information Terminal (OIT) and Portable MaintenanceAccess Terminal (PMAT). In turn, it sends terminals orders to thePDMCs.




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POWER DISTRIBUTION MAINTENANCE INTERFACE (PDMI)




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AC & DC GENERATION PRESENTATIONGeneral

The basic core functions of the electrical power system are to generate,in all conditions, the electrical power required by the electrical loads. AnAC generation and a DC generation systems backed up by the batteryDC generation fulfill this power generation function. Note that dedicatedcontrol units manage the power quality and the protection of the powersources and the network. The electrical power system also distributesthis electrical power, to all of the systems that require electrical power,through an AC network and a DC network in normal operating conditions.These networks include an emergency network, still supplied in electricalemergency configuration, to maintain power to the essential loadsnecessary to complete the flight. For redundancy reasons, the electricalpower system is segregated in a side 1 and a side 2. It provides also tocockpit crew normal and emergency controls and indicating.At last, the electrical power system has a dedicated APU network,enabling to start the APU turbine.


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GENERAL




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AC & DC GENERATION PRESENTATIONAC Main Generation

The AC main generation is used in normal electrical configuration topower the electrical network in flight or on ground when the engines arerunning. The AC main generation is given by four Variable FrequencyGenerators (VFGs).

Main GeneratorsEach VFG is a generator with a variable frequency output. Each enginemechanically drives its related generator. It is rated to a power of 150KVA and delivers on 3 phases a voltage of 115 VAC over a frequencyrange of 370 to 770 Hz.Note that, all the VFGs are identical and interchangeable and theycan be installed on both engine versions.

Generator Control UnitTo maintain the output within the design limits, each VFG ismonitored, controlled and protected by its relative Generator andGround Power Control Unit (GGPCU). The main functions of theGGPCU are:o Voltage regulation,o Connection an disconnection to the network,o Generator and the electrical network protection,o Data transmission to other systems.o BITE functionNotice that all the GGPCUs are identical and interchangeable.

Control and IndicatingTwo pushbutton switches located on the overhead ELECtrical panelcontrol each VFG.o The DRIVE pushbutton switches are used for the mechanicaldisconnection of their associated VFGs.

o The GENerator pushbutton switches are used for the electricalconnection and disconnection of their related generators to and fromthe network.




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AC MAIN GENERATION - MAIN GENERATORS ... CONTROL AND INDICATING




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AC & DC GENERATION PRESENTATIONAC Main Generation (continued)

DistributionThe AC power delivered by the 4 VFGs is distributed to 4 mainnetworks part of the AC distribution network. In normal configurationwhen all the engines are running, each VFG supplies its relatednetwork as follows:- VFG 1 supplies AC network 1, which transfers AC power to the ACESSential network- VFG 2 supplies AC network 2,- VFG 3 supplies AC network 3,- VFG 4 supplies AC network 4, which offers a backup supply to theAC ESS network.If one or several VFGs are not available, the transfer circuitreconfigures the AC distribution network supply to keep it powered.Note that 3 VFGs are necessary to power the entire electrical networkincluding the galleys. Note also that the 4 AC main networks are partof the primary distribution while the AC ESS network is part of theemergency distribution.




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AC MAIN GENERATION - DISTRIBUTION




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AC & DC GENERATION PRESENTATIONAC Auxiliary Generation

The AC auxiliary generation can be used on ground or in flight to powerthe electrical network if a Ground Power Unit (GPU) or a VFG is notavailable. The AC auxiliary generation is given by two APU GENerators:the APU GEN A and the APU GEN B.

Auxiliary GeneratorsBoth APU GENs are mechanically driven at a constant speed by theAPU. Each generator is rated to a power of 120 KVA and delivers on3 phases a voltage of 115 VAC with a constant frequency of 400 Hz.Note that APU generator and VFGs are not interchangeable.

Generator Control UnitTwo GGPCUs control and monitor the output of the APU generatorsto ensure their outputs are within design limits. Respectively, theGGPCU 5 manages the APU GEN A and the GGPCU 6 manages theAPU GEN B. For the AC auxiliary generation, the GGPCUs fulfillthe following functions:o Voltage regulation,o Connection and disconnection to the network,o APU GEN and the electrical network protection,o Data transmission to other systems,o BITE function.Note that these two GGPCUs are identical and interchangeable withthe VFG GGPCU's.

Control and IndicatingThe APU GEN P/B SW installed on the overhead ELECtrical panelcontrols each APU generator. The APU GEN P/B SWs are used forthe electrical connection and disconnection of the related APUgenerator to and from the network.

DistributionEach APU Generator has the ability to power its related side of theAC distribution network through the transfer circuit as follows:- The APU GEN A supplies the AC network 1 and 2,- The APU GEN B supplies the AC network 3 and 4.The transfer circuit does the reconfiguration according to the sourcesavailability and segregation between side 1 and 2 when both APUgenerators are connected at the same time.




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AC AUXILIARY GENERATION - AUXILIARY GENERATORS ... DISTRIBUTION




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AC & DC GENERATION PRESENTATIONAC External Power

The AC external power can be used on ground to supply the wholeelectrical network if VFGs are not available. It can also supply part ofthis network for ground servicing. The AC external power can be suppliedby up to four GPUs.

Ground Power Unit (GPU)The four GPUs can be connected to the aircraft through four externalelectrical power plugs installed behind the nose landing gear. Eachplug accepts a power of 90 KVA with a voltage of 115 VAC and aconstant frequency of 400 Hz, delivered on 3 phases.There are two kinds of GPU that can be connected:- The conventional GPUs delivering a power of 90KVA on one output,- The GPUs delivering a power of 180KVA on two outputs of 90KVA each. Note that this kind of GPU can feed two out of the fouraircraft electrical plugs with a single unit.

Ground Power Control UnitAs for the VFGs and the APU GENs, the quality of the electricalpower delivered by each GPU is monitored by its relative GGPCU.Note that the four GGPCUs monitoring and protecting the externalpower are the same ones that manage the four VFGs:o GGPCU 1 manages the VFG 1 and the EXT PWR 1,o GGPCU 2 manages the VFG 2 and the EXT PWR 2,o GGPCU 3 manages the VFG 3 and the EXT PWR 3,o GGPCU 4 manages the VFG 4 and the EXT PWR 4.For the EXT PWR, the GGPCUs fulfill the following functions:o Connection and disconnection to the network,o Electrical network protection,o Data transmission to other systems,o BITE function.

Control and IndicatingAn EXT P/B SW installed on the overhead ELEC panel controls eachEXT PWR. The P/B SWs are used to monitor the GPU status(available or not) and control the electrical connection anddisconnection of the related GPU to and from the AC network.

Normal SupplyWhen all parameters are within the design feature limits, and an EXTP/B SW is pressed in, the associated GPU supplies directly its relativeAC main network. The entire AC distribution network including allgalleys can be supplied either by four conventional 90 KVA GPUsor by two 180 KVA GPUs. If only 2 conventional GPUs or a single180 KVA GPU is connected, the whole aircraft systems are poweredexcept the galleys.




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AC EXTERNAL POWER - GROUND POWER UNIT (GPU) ... NORMAL SUPPLY




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AC & DC GENERATION PRESENTATIONDC Main and Essential Generation

The DC main and essential generation is used in normal electricalconfiguration to power the whole DC electrical network in flight or onground as soon as the AC distribution network is powered. In addition,the DC essential generation is also used in electrical emergencyconfiguration to supply part of the DC network. The DC main generationis composed of two Battery Charge Rectifier Units (BCRUs) and oneTransformer Rectifier (TR) while the DC essential generation is done byone BCRU.

Battery Charge Rectifier Unit (BCRU)There are three identical BCRUs to supply the DC network: BCRU1, BCRU 2 and BCRU ESS. Each BCRU gathers together in a singleunit a 115 VAC / 28 VDC converter delivering 300A and a batterycharge limiter. Supplied by the AC network, the BCRU fulfills:o The regulation of the delivered DC voltage,o The control and the protection of its own operation and of theassociated battery,o The data transmission to other systems,o The Bite function.

Transformer Rectifier (TR)The TR 2 is used as a backup of the BCRU 2. It ensures throughdifferent technology the same functions as the BCRUs except for themanagement of the battery control and the regulation of the deliveredDC voltage. When supplied by the AC network, the TR2 transformsthe 115 VAC into a 28 VDC unregulated voltage with a power of300A.




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DC MAIN AND ESSENTIAL GENERATION - BATTERY CHARGE RECTIFIER UNIT (BCRU) & TRANSFORMER RECTIFIER (TR)




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AC & DC GENERATION PRESENTATIONDC Main and Essential Generation (continued)

DistributionThe BCRU 1, powered by the AC NETWORK 2, supplies the side 1of the DC network called DC NETWORK 1. In normal configuration,the BCRU 2, powered by AC NETWORK 3, supplies the side 2 ofthe DC network called DC NETWORK 2. In case of loss of BCRU2, the TR 2 takes over the supply of the DC NETWORK 2. The BCRUESS, powered by AC ESS NETWORK, supplies the DC ESSNETWORK. Note that the DC NETWORK 1 and 2 are part of theprimary distribution, and the DC ESSENTIAL NETWORK is part ofthe EMERGENCY distribution.




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DC MAIN AND ESSENTIAL GENERATION - DISTRIBUTION




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AC & DC GENERATION PRESENTATIONBattery DC Generation

The battery DC generation keeps on supplying DC electrical power incase of AC and/or DC power cut off in case of power sourcereconfiguration or in emergency conditions and for specific operationson ground like refueling.

BatteriesThere are three identical and interchangeable batteries:o Two main batteries, BAT 1 and BAT 2,o One BAT ESS.Each battery has a nominal capacity of 50 Ah and delivers 28 VDC.

Battery Charge ControlThe BCRUs control the charge of the batteries. Each BCRU monitorsand protects its relative battery and manages its connection to the DCnetwork. In case of loss of the BCRU 2, the TR2 connects the BAT2 to the DC NETWORK 2 and protects it.Note that TR 2 carries out the same functions for its associated battery.

Control and IndicatingThere is one BAT P/B SW for each battery. It is used for manualconnection and disconnection of the related battery to and from theDC network.

DistributionIn normal configuration, all batteries are permanently connected tothe DC network in parallel with their related BCRU. This configurationmaintains DC supply during BCRUs power loss induced by the ACsources reconfiguration. This is called the No Break Power Transfer(NBPT) function only available on the DC network. In normalconfiguration, the BAT 1 is connected to the DC NETWORK 1, theBAT 2 is connected to the DC NETWORK 2, the BAT ESS is

connected to the DC ESS NETWORK. Note that on battery only, theBAT 1 is also used to supply the DC essential network.




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BATTERY DC GENERATION - BATTERIES ... DISTRIBUTION




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AC & DC GENERATION PRESENTATIONAPU Starting System

The APU STARTING system is a DC electrical network. This networklets the APU be started on ground or in flight with or without AC sources.This network can be supplied either from the AC NETWORK 4 via theAPU TR or directly from the APU BAT but not from both at the sametime.

APU TR and APU BatteryThe APU TR is identical and interchangeable with the TR 2 andsupplies a power of 300 A. In addition, the APU BAT is identical andinterchangeable with the three other batteries (capacity of 50 Ah).The APU TR fulfills the APU BAT management. Note that APU TRand APU BAT are dedicated sources and cannot be connected to theDC network.

Control and IndicatingThe APU BAT P/B SW is used for manual connection anddisconnection of the APU battery to and from the DC network.




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APU STARTING SYSTEM - APU TR AND APU BATTERY & CONTROL AND INDICATING




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AC & DC GENERATION PRESENTATIONService Bus Supply

The AC and DC electrical distribution networks include a ground servicenetwork supplying loads used to do the ground servicing without poweringthe whole aircraft network. This ground service network can be suppliedeither by the electrical network when it is powered (normal supply) oron ground directly from the EXT PWR 1 connection when the GrouNDSerViCE ConTroL (GND SVCE CTL) switch is set to ON. Note that inthe second case, the main AC and DC networks are not supplied.The GND SVCE CTL switch is located near the main-deck cabin doorM1L.




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SERVICE BUS SUPPLY




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AC & DC GENERATION PRESENTATIONStatic Inverter AC Generation

The STATic INVerter AC generation supplies AC power when onlybatteries are available either on ground or in flight in emergency electricalconfiguration.

Static InverterThe STAT INV transforms the DC voltage from the BAT 1 and fromthe BAT ESS into a single phase 115 VAC 400 Hz output supply.The nominal power rate of the STAT INV is 2.5 KVA.

DistributionWhen there is no AC power available and provided the BAT 1 andBAT ESS are active, the STAT INV supplies automatically part ofthe AC ESS network. Note that in this configuration, the DC ESSnetwork is supplied directly from the BAT 1 and from the BAT ESS.




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STATIC INVERTER AC GENERATION - STATIC INVERTER & DISTRIBUTION




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AC & DC GENERATION PRESENTATIONAC Emergency Generation

The AC emergency generation is used in electrical emergencyconfiguration to keep the feeding of the essential loads necessary tocomplete the flight and to make a safe landing.

Emergency GeneratorAn EMERgency GENerator (EMER GEN) mechanically driven bythe RAT gives the AC emergency generation. The EMER GEN israted to a power of 70 KVA and delivers on 3 phases a voltage of 115VAC over a frequency range of 370 to 800 Hz.

Generator Control UnitA Generator Control Unit (GCU) controls the EMER GEN.The GCU manages the EMER GEN for the following functions:o Voltage regulation,o Control of connection and the disconnection to the network,o Protection of the generator and of the network,o Data transmission to other systems,o BITE function.

Control and IndicatingThe RAT extends automatically in electrical emergency configuration(Total Engine Flame Out (TEFO) or Loss of Main Electrical System(LMES)). If not, the RAT MAN ON P/B SW located on the EMERELEC PWR panel forces the RAT to extend. Note that in case ofemergency generator shutdown due to a failure, the EMER GENFAULT comes on red. The STOW panel located in the belly fairing,is dedicated to maintenance and is used to stow the RAT on groundwhatever the reason of the deployment (emergency and inadvertentoperation or test).

DistributionWhen the RAT is extended, the EMER GEN supplies directly the ACESS NETWORK. In this configuration, the DC ESS NETWORK issupplied in parallel with the BCRU ESS, the BAT ESS and the BAT1.




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AC EMERGENCY GENERATION - EMERGENCY GENERATOR ... DISTRIBUTION




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AC & DC GENERATION PRESENTATIONElectrical Network Overview

Here is an overview of the entire electrical power network.




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ELECTRICAL NETWORK OVERVIEW




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ELECTRICAL POWER SYSTEM MAINTENANCE (1)Electrical Power System Safety Items

Here is an overview of main safety precautions relative to the electricalsystem. First of all, make sure that you obey all the Aircraft MaintenanceManual (AMM) safety procedures and precautions to prevent injury topersons and/or damage to the aircraft.Due to the high voltage on the electrical system, make sure that theelectrical sources are disconnected and make sure that you ground andbond the aircraft to avoid electrostatic damage.Before starting maintenances operations, make sure that all the safetydevices and all the warning notices are put in place. Make sure also thatthe working zone is secured.Related to the aircraft dimensions, certain maintenance tasks will beperformed on high working area. Thus, use a harness connected to thededicated attachment points on the aircraft for safety reasons.When you work on a Variable Frequency Generator (VFG), an APU orany other device, be aware of the hot temperature which can injure you.Depending on the maintenance task to perform and the component'sweight, specific tooling required must be used.


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ELECTRICAL POWER SYSTEM MAINTENANCE (1)Electrical Power System Ground Support Equipments

The electrical maintenance tasks require some Ground SupportEquipments (GSE's).The Main GSEs used for the electrical maintenance are:- The engine oil filling up is used to top up the oil level of the VFG.- The pulley lift is used to perform the battery removal or installation viathe access door located behind the nose landing gear.- The Ground Power Unit (GPU), with two output plugs, delivering 180KVA is used to supply two external power plugs.- The cable holding strap is used to secure the GPU plug to the aircraft.- The safety pin of the Ram Air Turbine (RAT) is a safety devicenecessary to prevent inadvertent deployment of the RAT on ground duringservicing or maintenance.- Use the RAT ground test tool to check that the turbine works properly.Refer to the AMM for the tasks. Also, refer to the illustrated Tool andEquipment Manual (TEM) for the complete list of tools.




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AIRBUS S.A.S.31707 BLAGNAC cedex, FRANCE

STMREFERENCE L0Y06082

MARCH 2006PRINTED IN FRANCEAIRBUS S.A.S. 2006

ALL RIGHTS RESERVED

AN EADS JOINT COMPANYWITH BAE SYSTEMS

Table of ContentsElectrical Power System IntroductionGeneralElectrical GenerationElectrical Generation

Electrical generationAC normal GENERATIONDC GENERATIONAPU STARTING SYSTEMAC eMERGENCY GENERATION and static inverter

ELECTRICAL DISTRIBUTIONControl and indicating

Electrical System Philosophy PresentationGeneralElectrical GenerationAC GenerationDC Generation

Electrical Distribution Layout PrinciplePrimary DistributionSecondary DistributionEmergency Distribution

Electrical Distribution Monitoring and ManagementCBM ApplicationELM Application

Power Distribution Maintenance Interface (PDMI)

AC & DC Generation PresentationGeneralAC Main GenerationMain GeneratorsGenerator Control UnitControl and IndicatingDistribution

AC Auxiliary GenerationAuxiliary GeneratorsGenerator Control UnitControl and IndicatingDistribution

AC External PowerGround Power Unit (GPU)Ground Power Control UnitControl and IndicatingNormal Supply

DC Main and Essential GenerationBattery Charge Rectifier Unit (BCRU)Transformer Rectifier (TR)Distribution

Battery DC GenerationBatteriesBattery Charge ControlControl and IndicatingDistribution

APU Starting SystemAPU TR and APU BatteryControl and Indicating

Service Bus SupplyStatic Inverter AC GenerationStatic InverterDistribution

AC Emergency GenerationEmergency GeneratorGenerator Control UnitControl and IndicatingDistribution

Electrical Network Overview

Electrical Power System Maintenance (1)Electrical Power System Safety ItemsElectrical Power System Ground Support Equipments

Documents

A380-LEVEL I - ATA 24 Electrical Power