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General
The distribution section of electrical power includes AC and DC
power distribution.
AC ELECTRICAL LOAD DISTRIBUTION - INTRODUCTION
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General
The AC electrical load distribution system divides the AC buses
into other buses and sections. This permits better control over
small electrical loads. This also protects against severe loss of
power due to a single power failure.
These are the AC power sources:
* Integrated drive generator 1 (IDG 1)
* IDG 2
* APU starter-generator
* AC external power
* Static inverter.
These are the control units that control electrical power
distribution:
* Generator control unit 1 (GCU 1)
* GCU 2
* APU generator control unit (AGCU)
* Bus power control unit (BPCU)
* Standby power control unit (SPCU).
See the AC generation section for more information about the
GCUs. (SECTION 24-20)
See the external power section for more information about the
BPCU. (SECTION 24-40)
See the DC generation section for more information about the
SPCU. (SECTION 24-30)
The relays, breakers, and buses that distribute electrical power
are in these panels:
* Power distribution panels (PDPs)
* P6 panel
* P18 panel.
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Purpose
The load shed relays control power to the main buses and the
galley buses to protect the power source from overload.
Location
The load shed relays are in the aft part of each power
distribution panel (PDP). You remove panels in the forward
cargo compartment to get access to the aft face of the PDPs.
You then remove panels on the PDPs to get access to the load
shed relays.
General Description
The bus power control unit (BPCU) controls the load shed
relays. The load shed relays open when the BPCU de-energizes
them.
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