Electrical System - created from Mind Map

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AC POWER

DC POWER

Standby Power Supplies AC AND DC POWER TO SELECTIED KEY ITEMS

Flight Control Power

Backup power

ELMS Provides load management and protection

Back up Generators BUG)

Converter receives input from both back generators at al times ENG are running Can select and process inputs from only one BUG or the other, not both simutaneously

Permanent Magnet Generators Two contained in each BUG Supply AC power to flight control Power Supply Assemblies (PSA) PASs convert power from AC to DC fro flight control computer use Output is dedicated to flight controls can't be diverted elsewhere

One in each ENG accessory drive

Recerive in put from both backup generators at all times ENG are Running

Out put is regulated to 400 Hz by a converter

L & R ENG IDG

APU GEN

External power Primary and Secendary

Bus Tie breaker Priority Respective side APU Opposite Side

Electrically identical to IDG generators

4 kinds of Priority

Transformer Rectifirer Units

L TRU

C2 TRU

R TRU

C1 TRU

L Main DC Bus L Flt Ctrl Bus R main DC Bus

First Officer's Flt Instrument Bus CA Flight Instrument Bus

R Main DC bUS R FLT Ctrl Bus R Main DC Bus

Captains's Flight Instrument Bus Battery Bus Hot Battery Bus Standby Inverter

Main Battery Can power standby system for a minimwm for 10 minuts

Standby inverter

RAT Generator and associated generator control unit

C1 TRU

C2 TRU

Hot Battery Bus

L C Flight Control Busees

Battery Bus

Captains flight Instrument Bus

Powered by R main DC bus (through the Ground Service Bus )

When powerd, the battery charger powers Hot battery bus L and R flight control bussed

AC Standby Bus

Captains's flight Instrument Bus

Battery Bus

Center Flight Control PSA

First Officers Instrument Bus