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A ground external power connector enables all bus
bars to be supplied.
External power characteristics are : 115 Volts, 400
Hertz 90 KVA (minimum).
EMERGENCY GENERATOR
An AC emergency generator is driven by the Ram Air
Turbine hydraulic circuit.
It automatically provides emergency power in case of
failure of all main aircraft generators.
Emergency generator characteristics are: 115 Volts,
400 Hertz, 5 KVA.
AC TRANSFER
The AC transfer circuit enables AC buses to be supplied
by any generator or external power, via the Bus
Transfer Contactors ( BTCs ).
Generators are never connected in parallel on the same
bus.
The priorities are:
1 - GEN 1 (2) on AC BUS 1 (2)
2 - EXT PWR even with one engine generator still
running.
3 - APU generator
4 - The remaining engine generator.
AC DISTRIBUTION
AC BUS 1/2
Each engine generator supplies its related AC bus.
AC ESS BUS
The AC ESS BUS is normally supplied by AC BUS 1, or
by AC BUS 2 if AC BUS 1 fails.
AC ESS SHED BUS
The AC ESS SHED BUS is supplied by the AC ESS BUS.
115/26 V AUTO TRANSFORMER
A 115 Volts to 26 Volts single phase autotransformer
supplying a normal 26 Volts 400 Hertz sub-busbar is
connected to each main busbar and to the essential
busbar.
TMUELE104-T01 LEVEL 1
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ELECTRICAL SYSTEM DIAGRAM DESCRIPTION
DC GENERATION
DC generation is accomplished by Transformer
Rectifiers 1 and 2 (TR1 and TR2).
All Transformer Rectifier characteristics are :
maximum output of 200 A, 28 VDC.
The ESS Transformer Rectifier unit replaces a faulty
main TR to power the DC ESS BUS.
DC DISTRIBUTION
DC BUS 1/2
DC BUS 1 and DC BUS 2 are supplied by their related
Transformer Rectifier.
DC BAT BUS
The DC BAT BUS is supplied by DC BUS 1 or by DC BUS 2
if DC BUS 1 fails. Batteries can also supply the DC
BAT BUS.
DC ESS BUS
The DC ESS BUS is supplied by the DC BAT BUS. In an
emergency, it is supplied either by BAT 2 or by the
ESS Transformer Rectifier.
DC ESS SHED BUS
The DC ESS SHED BUS is supplied by the DC ESS BUS.
BATTERIES
Two batteries can be connected to the DC BAT BUS. Each
battery has its own bus, HOT BUS 1 and HOT BUS 2. They
are permanently supplied.
Battery capacity is 23 Ah, nominal voltage is 24 VDC.
STATIC INVERTER
On batteries only, the static inverter connected to
battery 1 supplies the AC STAT INV BUS. Static Inverter
characteristics are : 115 Volts, 400 Hertz.
GROUND / FLIGHT BUSES
AC and DC ground flight buses are normally supplied
by the aircraft network, or directly by the external
power unit, upstream of the External Power Contactor,
without energizing the whole aircraft network.
GALLEYS
The main and secondary electrical circuits of the
galleys are supplied by AC BUS 1 and 2. The main
electrical circuits are shed in single generator
operation.
TMUELE104-T02 LEVEL 1
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MAIN ELEC CONFIGURATIONS
GROUND SUPPLY
On ground, the complete circuit may be supplied by the
external power unit or by the APU generator.
TMUELE104-T03 LEVEL 1
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MAIN ELEC CONFIGURATIONS (CONT’D)
　
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