T-45C TS, ADV & IUT ENG-02
Electrical System
2.
Distribution
Overlay 4
Generator Bus
a.
28 VDC generator bus supplies non-essential
services and is distributed by three circuit
Overlay 5
breaker panels
28 VDC Essential
Services Bus
b.
28 VDC essential services bus links to 28 VDC
generator bus through two power isolation
(1)
Power isolation diodes isolate essential
services bus from generator bus if
generator fails
(2)
28 VDC essential services bus power is
distributed by a single circuit breaker panel
Overlay 6
Batteries
(3)
Charge batteries
3.
Battery operations
a.
Two 24 volt, 18 AH lead acid batteries supply
power to essential services bus
(1) Provide DC power during engine start
(2) If generator fails, supply emergency voltage
to 28 VDC essential services bus
b.
Charged as long as generator is on-line and
batteries are connected to essential services
bus
c.
Battery #1 supplies power to ground services
Overlay 7
bus
Ground Services Bus
(1) Provides DC power during refuel/defuel
Sg 2, fr 10
B.
AC power system: consists of two identical 26/115 VAC,
(3 Overlays)
400 Hz single phase inverters, two 26 VAC buses, and
Fig 1: Electrical
System Block Diagram
two 115 VAC buses
1.
Power generation
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