A380-LEVEL I - ATA 24 Electrical Power

5/25/2018

A380-LEVEL I - ATA 24 Ele c tr ic a l Powe r - slide pdf.c om

A380

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

http://slide pdf.c om/re a de r/full/a 380-leve l-i-a ta -24-e le c tr ic a l-powe r

1/62

5/25/2018



2/62

5/25/2018


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 reserved No 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.


3/62

5/25/2018



4/62

5/25/2018


A380 TECHNICAL TRAINING MANUAL

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

0 T 0 T D 0 L 2 8 0 6 0 Y 0 L

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


TABLE OF CONTENTS

Mar 21, 2006 Page 1

5/62

5/25/2018



ELECTRICAL POWER SYSTEM INTRODUCTION General The electrical system generates and distributes electrical power to aircraft systems and can be split into two parts: - The electrical generation system - The electrical distribution system.

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

1 0 0 0 0 0 00 1 Z 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L



ELECTRICAL POWER SYSTEM INTRODUCTION

Mar 15, 2006 Page 2

6/62

5/25/2018



1 0 0 0 0 0 00 1 Z 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

GENERAL - ELECTRICAL GENERATION & ELECTRICAL GENERATION Y 0 L




Mar 15, 2006 Page 3

7/62

5/25/2018



ELECTRICAL POWER SYSTEM INTRODUCTION Electrical generation The entire aircraft electrical system is supplied with AC and DC power sources.

AC normal GENERATION In normal configuration, the entire AC network can be supplied by three 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).

1 0 0 0 0 0 00 1 Z 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L




Mar 15, 2006 Page 4

8/62

5/25/2018



1 0 0 0 0 0 00 1 Z 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

ELECTRICAL GENERATION - AC NORMAL GENERATION Y 0 L




Mar 15, 2006 Page 5

9/62

5/25/2018



ELECTRICAL POWER SYSTEM INTRODUCTION Electrical generation (continued) DC GENERATION In normal Configuration, the entire DC network is supplied from the AC network via: - Three Battery Charge Rectifier Units (BCRUs), - And three main BATteries (BATs). In abnormal configuration, part of the DC network can be supplied from the AC network via a Transformer Rectifier (TR).

1 0 0 0 0 0 00 1 Z 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L




Mar 15, 2006 Page 6

10/62

5/25/2018



1 0 0 0 0 0 00 1 Z 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

ELECTRICAL GENERATION - DC GENERATION Y 0 L




Mar 15, 2006 Page 7

11/62

5/25/2018



ELECTRICAL POWER SYSTEM INTRODUCTION Electrical generation (continued) APU STARTING SYSTEM The APU needs DC electrical power to start up. The APU starting system is a part of the DC network dedicated to the APU starting and is supplied via: - The APU TR, - Or the APU BAT.

1 0 0 0 0 0 0 1 Z 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L




Mar 15, 2006 Page 8

12/62

5/25/2018



1 0 0 0 0 0 0 0 1 Z 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

ELECTRICAL GENERATION - APU STARTING SYSTEM Y 0 L




Mar 15, 2006 Page 9

13/62

5/25/2018



ELECTRICAL POWER SYSTEM INTRODUCTION Electrical generation (continued) AC eMERGENCY GENERATION and static inverter In electrical emergency configuration, the supply of the electrical loads essential for flying is recovered from the electrical Ram Air Turbine (RAT). When no AC power source is available, part of the AC network can be supplied by the STAtic INVerter.

1 0 0 0 0 0 0 0 1 Z 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L




Mar 15, 2006 Page 10

14/62

5/25/2018



1 0 0 0 0 0 0 0 1 Z 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

ELECTRICAL GENERATION - AC EMERGENCY GENERATION AND STATIC INVERTER Y 0 L




Mar 15, 2006 Page 11

15/62

5/25/2018



ELECTRICAL POWER SYSTEM INTRODUCTION ELECTRICAL DISTRIBUTION The electrical distributing system allows distribution of AC and DC electrical power to the various electrical loads according to the availability of the power source. It also performs network protection and reconfiguration. The electrical distributing system is split in 3 subsystems: - A primary distribution done by the Primary Electrical Power Distribution Center (PEPDC), - A secondary distribution done by the Secondary Electrical Power Distribution centers (SEPDCs) and the Secondary Power Distribution Boxes (SPDBs), - An emergency distribution released by the Emergency Power Center.

1 0 0 0 0 0 0 0 1 Z 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L




Mar 15, 2006 Page 12

16/62

5/25/2018



1 0 0 0 0 0 0 0 1 Z 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

ELECTRICAL DISTRIBUTION Y 0 L




Mar 15, 2006 Page 13

17/62

5/25/2018



ELECTRICAL POWER SYSTEM INTRODUCTION Control and indicating The control and indicating of the electrical power system is composed of: - 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.

1 0 0 0 0 0 0 0 1 Z 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L




Mar 15, 2006 Page 14

18/62

5/25/2018



1 0 0 0 0 0 0 0 1 Z 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

CONTROL AND INDICATING Y 0 L




Mar 15, 2006 Page 15

19/62

5/25/2018



ELECTRICAL SYSTEM PHILOSOPHY PRESENTATION General The basic core functions of the electrical system allow: - To generate electrical power in all aircraft configurations thanks to the electrical generation system, - And to distribute this electrical power to the aircraft electrical loads through the electrical distribution system.

1 0 0 0 0 0 0 0 1 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L



ELECTRICAL SYSTEM PHILOSOPHY PRESENTATION

Mar 15, 2006 Page 16

20/62

5/25/2018



1 0 0 0 0 0 0 0 1 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

GENERAL Y 0 L




Mar 15, 2006 Page 17

21/62

5/25/2018



ELECTRICAL SYSTEM PHILOSOPHY PRESENTATION Electrical Generation The electrical generation system is split into an Alternating Current (AC) and a Direct Current (DC) generation.

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

AC Generation The AC generation is divided into a normal and an emergency electrical 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 to reliability and weight saving requirements related to the four main generators called Variable Frequency Generators (VFGs). Note that the VFGs can be installed on both engine versions. The emergency generator is no longer a Constant Speed Motor / Generator (CSM/G) but a variable frequency Ram Air Turbine (RAT) generator. Note that the variable frequency rectification is done inside each system through technologies, which are dependent on the equipment. Fixed Frequency:

0 0

available.

1

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 is 0 0 0 0 0 1 P 4 2

DC Generation M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L

DC generation delivers 28 Volts Direct Current (VDC). The DC generation is divided into a normal DC generation and a specific APU starting system. The normal DC generation, which is split into a DC main, essential and battery generation, is made up of: - Three Battery Charge Rectifier Units (BCRUs), - A Transformer Rectifier (TR), MAINTENANCE COURSE - T1 & T2 (RR / Metric) LEVEL I - ATA 24 Electrical Power



Mar 15, 2006 Page 18

22/62

5/25/2018



1 0 0 0 0 0 0 0 1 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

ELECTRICAL GENERATION - AC GENERATION & DC GENERATION Y 0 L




Mar 15, 2006 Page 19

23/62

5/25/2018



ELECTRICAL SYSTEM PHILOSOPHY PRESENTATION Electrical 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 to keep supplied, through the emergency distribution, the electrical loads essential to complete flight and to perform a safe landing. The main distribution system is composed of two distribution subsystems in order to segregate the high power loads supply from the low power loads supply. These two distribution systems are called: - The primary distribution system, - The secondary distribution system,

1 0 0 0 0 0 0 0 1 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L




Mar 15, 2006 Page 20

24/62

5/25/2018



1 0 0 0 0 0 0 01 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

ELECTRICAL DISTRIBUTION LAYOUT PRINCIPLE Y 0 L




Mar 15, 2006 Page 21

25/62

5/25/2018



ELECTRICAL SYSTEM PHILOSOPHY PRESENTATION emergency distribution transfers AC and DC electrical power from the primary distribution to the essential loads. The essential loads keep the aircraft vital organs supplied in order to fly and land safely.

Electrical Distribution Layout Principle (continued) Primary Distribution The primary distribution is done by the Primary Electrical Power Distribution Center (PEPDC). The PEPDC is split into side 1 and side 2 to make a redundant and segregated normal electrical supply. The PEPDC contains the main electrical network components for power distribution, network management, and the associated electrical protective devices. It manages power transfers from AC and DC generation 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 Distribution

1

The secondary distribution is done by two Secondary Electrical Power Distribution Centers (SEPDCs) (one for side1 and one for side 2) and eight Secondary Power Distribution Boxes (SPDBs). The SEPDCs and SPDBs contain electrical protective devices. - Six SPDB's are installed in the cabin and transfer electrical power from the PEPDC to the cabin commercial loads. The two other SPDB's are installed in the lower deck and transfer electrical power from PEPDC to the cabin and cargo commercial loads. 0 0 0 0 0 0 01

- The two SEPDCs transfer electrical power from PEPDC to technical loads. Notice that loads powered by the secondary distribution are loads consuming less than or 15A maximum. P 4 2 M L 0 T 0 T

Emergency Distribution D 0 L 2 8 0 6 0 Y 0 L

The emergency distribution is done by the Emergency Power Center. This center contains the emergency electrical network components for power distribution and the associated protective devices. The MAINTENANCE COURSE - T1 & T2 (RR / Metric) LEVEL I - ATA 24 Electrical Power



Mar 15, 2006 Page 22

26/62

5/25/2018



1 0 0 0 0 0 0 10 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

ELECTRICAL DISTRIBUTION LAYOUT PRINCIPLE - PRIMARY DISTRIBUTION ... EMERGENCY DISTRIBUTION Y 0 L




Mar 15, 2006 Page 23

27/62

5/25/2018



ELECTRICAL SYSTEM PHILOSOPHY PRESENTATION Electrical Distribution Monitoring and Management To distribute safely the electrical power, two applications, the Circuit Breaker Monitoring (CBM) application and the Electrical Load Management (ELM) application, monitor and manage the entire electrical distribution network. These applications are hosted in two Core Processing Input/Output Modules (CPIOM) dedicated to the electrical system: the CPIOM-E1 and the CPIOM-E2.

CBM Application The CBM application monitors the status of all different protective devices of the aircraft and sends a status message to the cockpit when any protective device has tripped.

ELM Application

The ELM application makes an optimum use of the electrical loads within the limit of the power sources. For that, the ELM application receives the status of all power sources. In case of an overload, it sheds most of the loads through the main and emergency distribution systems. Electrical loads are reconnected when enough power is available on the power sources. 1 0 0 0 0 0 0 10 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L




Mar 15, 2006 Page 24

28/62

5/25/2018



1 0 0 0 0 0 0 01 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

ELECTRICAL DISTRIBUTION MONITORING AND MANAGEMENT - CBM APPLICATION & ELM APPLICATION Y 0 L




Mar 15, 2006 Page 25

29/62

5/25/2018



ELECTRICAL SYSTEM PHILOSOPHY PRESENTATION Power Distribution Maintenance Interface (PDMI) The Power Distribution Maintenance Interface (PDMI) allows the maintenance crew, monitor and control (open, secure, tag and close) the various remote protective devices installed in the PEPDC, the SEPDC, the SPDB and the Emergency Power Center. The PDMI functions are achieved by 2 Power Distribution Maintenance Computers (PDMCs), which communicate with the electrical distribution systems, and by two Power Distribution Control System (PDCS) applications hosted in the Onboard Maintenance System (OMS). These applications receive information from the active PDMC and display the status of the various monitored protective devices on the Onboard Maintenance Terminal (OMT), On-board Information Terminal (OIT) and Portable Maintenance Access Terminal (PMAT). In turn, it sends terminals orders to the PDMCs.

1 0 0 0 0 0 0 01 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L




Mar 15, 2006 Page 26

30/62

5/25/2018



1 0 0 0 0 0 0 01 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

POWER DISTRIBUTION MAINTENANCE INTERFACE (PDMI) Y 0 L




Mar 15, 2006 Page 27

31/62

5/25/2018



AC & DC GENERATION PRESENTATION General The basic core functions of the electrical power system are to generate, in all conditions, the electrical power required by the electrical loads. An AC generation and a DC generation systems backed up by the battery DC generation fulfill this power generation function. Note that dedicated control units manage the power quality and the protection of the power sources and the network. The electrical power system also distributes this 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 electrical emergency configuration, to maintain power to the essential loads necessary to complete the flight. For redundancy reasons, the electrical power system is segregated in a side 1 and a side 2. It provides also to cockpit crew normal and emergency controls and indicating. At last, the electrical power system has a dedicated APU network, enabling to start the APU turbine.

1 0 0 0 0 0 0 02 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L



AC & DC GENERATION PRESENTATION

Mar 15, 2006 Page 28

32/62

5/25/2018



1 0 0 0 0 0 0 20 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

GENERAL Y 0 L




Mar 15, 2006 Page 29

33/62

5/25/2018



AC & DC GENERATION PRESENTATION AC Main Generation The AC main generation is used in normal electrical configuration to

o The GENerator pushbutton switches are used for the electrical connection and disconnection of their related generators to and from the network.

power the electrical network in flight or on ground when the engines are running. The AC main generation is given by four Variable Frequency Generators (VFGs).

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

Generator Control Unit

1

To maintain the output within the design limits, each VFG is monitored, controlled and protected by its relative Generator and Ground Power Control Unit (GGPCU). The main functions of the GGPCU 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 function Notice that all the GGPCUs are identical and interchangeable. 0 0 0 0 0 0 20 P 4 2 M

Control and Indicating L 0

Two pushbutton switches located on the overhead ELECtrical panel control each VFG. o The DRIVE pushbutton switches are used for the mechanical disconnection of their associated VFGs. T 0 T D 0 L 2 8 0 6 0 Y 0 L




Mar 15, 2006 Page 30

34/62

5/25/2018



1 0 0 0 0 0 0 20 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

AC MAIN GENERATION - MAIN GENERATORS ... CONTROL AND INDICATING Y 0 L



Mar 15, 2006 Page 31


35/62

5/25/2018



AC & DC GENERATION PRESENTATION AC Main Generation (continued) Distribution The AC power delivered by the 4 VFGs is distributed to 4 main networks part of the AC distribution network. In normal configuration when all the engines are running, each VFG supplies its related network as follows: - VFG 1 supplies AC network 1, which transfers AC power to the AC ESSential 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 the AC ESS network. If one or several VFGs are not available, the transfer circuit reconfigures the AC distribution network supply to keep it powered. Note that 3 VFGs are necessary to power the entire electrical network including the galleys. Note also that the 4 AC main networks are part of the primary distribution while the AC ESS network is part of the emergency distribution.

1 0 0 0 0 0 0 02 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L



Mar 15, 2006 Page 32


36/62

5/25/2018



1 0 0 0 0 0 0 02 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

AC MAIN GENERATION - DISTRIBUTION Y 0 L



Mar 15, 2006 Page 33


37/62

5/25/2018



AC & DC GENERATION PRESENTATION AC Auxiliary Generation The AC auxiliary generation can be used on ground or in flight to power the electrical network if a Ground Power Unit (GPU) or a VFG is not available. The AC auxiliary generation is given by two APU GENerators: the APU GEN A and the APU GEN B.

Auxiliary Generators Both APU GENs are mechanically driven at a constant speed by the APU. Each generator is rated to a power of 120 KVA and delivers on 3 phases a voltage of 115 VAC with a constant frequency of 400 Hz. Note that APU generator and VFGs are not interchangeable.

Distribution Each APU Generator has the ability to power its related side of the AC 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 sources availability and segregation between side 1 and 2 when both APU generators are connected at the same time.

Generator Control Unit

1

Two GGPCUs control and monitor the output of the APU generators to ensure their outputs are within design limits. Respectively, the GGPCU 5 manages the APU GEN A and the GGPCU 6 manages the APU GEN B. For the AC auxiliary generation, the GGPCUs fulfill the 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 with the VFG GGPCU's. 0 0 0 0 0 0 0 20 P 4 2 M

Control and Indicating L 0

The APU GEN P/B SW installed on the overhead ELECtrical panel controls each APU generator. The APU GEN P/B SWs are used for the electrical connection and disconnection of the related APU generator to and from the network. T 0 T D 0 L 2 8 0 6 0 Y 0 L



Mar 15, 2006 Page 34


38/62

5/25/2018



1 0 0 0 0 0 0 0 20 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

AC AUXILIARY GENERATION - AUXILIARY GENERATORS ... DISTRIBUTION Y 0 L



Mar 15, 2006 Page 35


39/62

5/25/2018



AC & DC GENERATION PRESENTATION AC External Power The AC external power can be used on ground to supply the whole electrical network if VFGs are not available. It can also supply part of this network for ground servicing. The AC external power can be supplied by up to four GPUs.

Ground Power Unit (GPU) The four GPUs can be connected to the aircraft through four external electrical power plugs installed behind the nose landing gear. Each plug accepts a power of 90 KVA with a voltage of 115 VAC and a constant 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 90 KVA each. Note that this kind of GPU can feed two out of the four aircraft electrical plugs with a single unit.

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

Normal Supply When all parameters are within the design feature limits, and an EXT P/B SW is pressed in, the associated GPU supplies directly its relative AC main network. The entire AC distribution network including all galleys can be supplied either by four conventional 90 KVA GPUs or by two 180 KVA GPUs. If only 2 conventional GPUs or a single 180 KVA GPU is connected, the whole aircraft systems are powered except the galleys.

Ground Power Control Unit

1

As for the VFGs and the APU GENs, the quality of the electrical power delivered by each GPU is monitored by its relative GGPCU. Note that the four GGPCUs monitoring and protecting the external power 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. 0 0 0 0 0 0 0 20 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L



Mar 15, 2006 Page 36


40/62

5/25/2018



1 0 0 0 0 0 0 0 20 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

AC EXTERNAL POWER - GROUND POWER UNIT (GPU) ... NORMAL SUPPLY Y 0 L



Mar 15, 2006 Page 37


41/62

5/25/2018



AC & DC GENERATION PRESENTATION DC Main and Essential Generation The DC main and essential generation is used in normal electrical configuration to power the whole DC electrical network in flight or on ground as soon as the AC distribution network is powered. In addition, the DC essential generation is also used in electrical emergency configuration to supply part of the DC network. The DC main generation is composed of two Battery Charge Rectifier Units (BCRUs) and one Transformer Rectifier (TR) while the DC essential generation is done by one BCRU.

Battery Charge Rectifier Unit (BCRU) There are three identical BCRUs to supply the DC network: BCRU 1, BCRU 2 and BCRU ESS. Each BCRU gathers together in a single unit a 115 VAC / 28 VDC converter delivering 300A and a battery charge 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 the associated battery, o The data transmission to other systems, o The Bite function.

Transformer Rectifier (TR) 1 0 0

The TR 2 is used as a backup of the BCRU 2. It ensures through different technology the same functions as the BCRUs except for the management of the battery control and the regulation of the delivered DC voltage. When supplied by the AC network, the TR2 transforms the 115 VAC into a 28 VDC unregulated voltage with a power of 300A. 0 0 0 0 0 20 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L



Mar 15, 2006 Page 38


42/62

5/25/2018



1 0 0 0 0 0 0 0 20 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

DC MAIN AND ESSENTIAL GENERATION - BATTERY CHARGE RECTIFIER UNIT (BCRU) & TRANSFORMER RECTIFIER (TR) Y 0 L



Mar 15, 2006 Page 39


43/62

5/25/2018



AC & DC GENERATION PRESENTATION DC Main and Essential Generation (continued) Distribution The BCRU 1, powered by the AC NETWORK 2, supplies the side 1 of the DC network called DC NETWORK 1. In normal configuration, the BCRU 2, powered by AC NETWORK 3, supplies the side 2 of the DC network called DC NETWORK 2. In case of loss of BCRU 2, the TR 2 takes over the supply of the DC NETWORK 2. The BCRU ESS, powered by AC ESS NETWORK, supplies the DC ESS NETWORK. Note that the DC NETWORK 1 and 2 are part of the primary distribution, and the DC ESSENTIAL NETWORK is part of the EMERGENCY distribution.

1 0 0 0 0 0 0 0 20 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L



Mar 15, 2006 Page 40


44/62

5/25/2018



1 0 0 0 0 0 0 0 20 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

DC MAIN AND ESSENTIAL GENERATION - DISTRIBUTION Y 0 L



Mar 15, 2006 Page 41


45/62

5/25/2018



AC & DC GENERATION PRESENTATION Battery DC Generation

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

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

Batteries There 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 Control The BCRUs control the charge of the batteries. Each BCRU monitors and protects its relative battery and manages its connection to the DC network. In case of loss of the BCRU 2, the TR2 connects the BAT 2 to the DC NETWORK 2 and protects it. Note that TR 2 carries out the same functions for its associated battery.

Control and Indicating 1

There is one BAT P/B SW for each battery. It is used for manual connection and disconnection of the related battery to and from the DC network. 0 0 0 0 0 0 0 20

Distribution P

In normal configuration, all batteries are permanently connected to the DC network in parallel with their related BCRU. This configuration maintains DC supply during BCRUs power loss induced by the AC sources reconfiguration. This is called the No Break Power Transfer (NBPT) function only available on the DC network. In normal configuration, the BAT 1 is connected to the DC NETWORK 1, the BAT 2 is connected to the DC NETWORK 2, the BAT ESS is 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L



Mar 15, 2006 Page 42


46/62

5/25/2018



1 0 0 0 0 0 0 0 20 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

BATTERY DC GENERATION - BATTERIES ... DISTRIBUTION Y 0 L



Mar 15, 2006 Page 43


47/62

5/25/2018



AC & DC GENERATION PRESENTATION APU Starting System The APU STARTING system is a DC electrical network. This network lets 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 the APU TR or directly from the APU BAT but not from both at the same time.

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

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

1 0 0 0 0 0 0 0 20 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L



Mar 15, 2006 Page 44


48/62

5/25/2018



1 0 0 0 0 0 0 0 20 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

APU STARTING SYSTEM - APU TR AND APU BATTERY & CONTROL AND INDICATING Y 0 L



Mar 15, 2006 Page 45


49/62


5/25/2018


AC & DC GENERATION PRESENTATION Service Bus Supply The AC and DC electrical distribution networks include a ground service network supplying loads used to do the ground servicing without powering the whole aircraft network. This ground service network can be supplied either by the electrical network when it is powered (normal supply) or on ground directly from the EXT PWR 1 connection when the GrouND SerViCE ConTroL (GND SVCE CTL) switch is set to ON. Note that in the second case, the main AC and DC networks are not supplied. The GND SVCE CTL switch is located near the main-deck cabin door M1L.

1 0 0 0 0 0 0 0 20 P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L



Mar 15, 2006 Page 46


50/62


5/25/2018


1 0 0 0 0 0 0 0 20P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

SERVICE BUS SUPPLY Y 0 L



Mar 15, 2006 Page 47


51/62


5/25/2018


AC & DC GENERATION PRESENTATION Static Inverter AC Generation The STATic INVerter AC generation supplies AC power when only batteries are available either on ground or in flight in emergency electrical configuration.

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

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

1 0 0 0 0 0 0 0 20P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L



Mar 15, 2006 Page 48


52/62


5/25/2018


1 0 0 0 0 0 0 0 20P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

STATIC INVERTER AC GENERATION - STATIC INVERTER & DISTRIBUTION Y 0 L



Mar 15, 2006 Page 49


53/62


5/25/2018


AC & DC GENERATION PRESENTATION AC Emergency Generation

Distribution

The AC emergency generation is used in electrical emergency

When the RAT is extended, the EMER GEN supplies directly the AC ESS NETWORK. In this configuration, the DC ESS NETWORK is

configuration to keep the feeding of the essential loads necessary to complete the flight and to make a safe landing.

supplied in parallel with the BCRU ESS, the BAT ESS and the BAT 1.

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

Generator Control Unit A 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 Indicating The 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 EMER 1 0 0 0 0 0 0 0 P20

ELEC PWR panel forces the RAT to extend. Note that in case of emergency generator shutdown due to a failure, the EMER GEN FAULT comes on red. The STOW panel located in the belly fairing, is dedicated to maintenance and is used to stow the RAT on ground whatever the reason of the deployment (emergency and inadvertent operation or test). 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L



Mar 15, 2006 Page 50


54/62


5/25/2018


1 0 0 0 0 0 0 0 P20 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

AC EMERGENCY GENERATION - EMERGENCY GENERATOR ... DISTRIBUTION Y 0 L



Mar 15, 2006 Page 51


55/62


5/25/2018


AC & DC GENERATION PRESENTATION Electrical Network Overview Here is an overview of the entire electrical power network.

1 0 0 0 0 0 0 0 P20 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L



Mar 15, 2006 Page 52


56/62


5/25/2018


1 0 0 0 0 0 0 0 20P 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

ELECTRICAL NETWORK OVERVIEW Y 0 L



Mar 15, 2006 Page 53


57/62


5/25/2018


ELECTRICAL POWER SYSTEM MAINTENANCE (1) Electrical Power System Safety Items Here is an overview of main safety precautions relative to the electrical system. First of all, make sure that you obey all the Aircraft Maintenance Manual (AMM) safety procedures and precautions to prevent injury to persons and/or damage to the aircraft. Due to the high voltage on the electrical system, make sure that the electrical sources are disconnected and make sure that you ground and bond the aircraft to avoid electrostatic damage. Before starting maintenances operations, make sure that all the safety devices and all the warning notices are put in place. Make sure also that the working zone is secured. Related to the aircraft dimensions, certain maintenance tasks will be performed on high working area. Thus, use a harness connected to the dedicated attachment points on the aircraft for safety reasons. When you work on a Variable Frequency Generator (VFG), an APU or any other device, be aware of the hot temperature which can injure you. Depending on the maintenance task to perform and the component's weight, specific tooling required must be used.

1 0 0 0 T NI A 3MP 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L


ELECTRICAL POWER SYSTEM MAIN TENANCE (1)

Mar 15, 2006 Page 54


58/62


5/25/2018


1 0 0 0 T IN A 3MP 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

ELECTRICAL POWER SYSTEM SAFETY ITEMS Y 0 L



Mar 15, 2006 Page 55


59/62


5/25/2018


ELECTRICAL POWER SYSTEM MAINTENANCE (1) Electrical Power System Ground Support Equipments The electrical maintenance tasks require some Ground Support Equipments (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 via the access door located behind the nose landing gear. - The Ground Power Unit (GPU), with two output plugs, delivering 180 KVA 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 device necessary to prevent inadvertent deployment of the RAT on ground during servicing 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 and Equipment Manual (TEM) for the complete list of tools.

1 0 0 0 T IN A P3M 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L



Mar 15, 2006 Page 56


60/62


5/25/2018


1 0 0 0 T NI A M P3 4 2 M L 0 T 0 T D 0 L 2 8 0 6 0

ELECTRICAL POWER SYSTEM GROUND SUPPORT EQUIPMENTS Y 0 L



Mar 15, 2006 Page 57


61/62

5/25/2018


AIRBUS S.A.S. 31707 BLAGNAC cedex, FRANCE STM REFERENCE L0Y06082 MARCH 2006 PRINTED IN FRANCE AIRBUS S.A.S. 2006 ALL RIGHTS RESERVED


62/62

A380-LEVEL I - ATA 24 Electrical Power

Recommend Documents