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MECHANICS / ELECTRICS & AVIONICS COURSE 24 ELECTRICAL POWER
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EXTERNAL POWER - AC/DC GROUND SERVICE DISTRIBUTION COMPONENTS
CONTACTOR 8PN
IDENTIFICATION
FIN: 8PN
LOCATION
ZONE: 212
COMPONENT DESCRIPTION
This contactor allows the DC SERVICE Bus normal supply.
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EXTERNAL POWER - AC/DC GROUND SERVICE DISTRIBUTION COMPONENTS - CONTACTOR 8PN
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EXTERNAL POWER - AC/DC GROUND SERVICE DISTRIBUTION COMPONENTS
CONTACTOR 12XN
IDENTIFICATION
FIN: 12XN
LOCATION
ZONE: 212
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24 - ELECTRICAL POWER
24-32-00 DC GENERATION - DC MAIN
GENERATION D/O
CONTENTS:
Transformer Rectifiers
Batteries
Distribution
Transformer Rectifier Operation
Battery Operation
Battery Charge Limiter Functions
Self Examination
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DC GENERATION - DC MAIN GENERATION D/O
TRANSFORMER RECTIFIERS
There are three identical Transformer Rectifiers (TR1,
TR2, and ESSential TR).
Each Transformer Rectifier (TR) converts the three
phase AC into 28 VDC.
BATTERIES
There are two identical nickel-cadmium batteries of
20 cells each.
If the battery voltage is below 25 VDC, when no other
electrical source is available, a charging cycle is
needed by setting the BAT P/B to ON and supplying the
DC normal network to permit charging.
The nominal capacity of each battery is 23 Ah.
DISTRIBUTION
TR1, powered from AC BUS 1, supplies DC BUS 1 and DC
BAT BUS.
TR2, powered from AC BUS 2, supplies DC BUS 2.
The ESS TR is either supplied from the AC ESS BUS or
the EMERGENCY GENERATOR. It can supply the DC ESS BUS
and the DC ESSENTIAL SHEDDABLE BUS when required.
The two batteries are connected to the DC BAT BUS.
Battery 1 can also supply the static inverter and
Battery 2 can supply the DC ESS BUS.
TRANSFORMER RECTIFIER OPERATION
The Transformer Rectifiers start to operate as soon
as they are supplied by the associated AC busbar.
Automatic switching is provided in case of TR1 or TR2
failure, to guarantee power supply to all affected DC
busbars.
BATTERY OPERATION
Battery 1 and Battery 2 are charged from DC BAT BUS
through contactors.
These contactors are controlled by the Battery Charge
Limiters (BCL).
BATTERY CHARGE LIMITER FUNCTIONS
Each BCL controls its battery contactor. The BCLs are
identical and interchangeable.
The battery contactors are controlled in order to:
- ensure automatic battery connection for
charging,
- protect the battery against thermal runaway
and short circuit,
- prevent complete discharging.
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DC GENERATION - DC MAIN GENERATION D/O
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