T-45A UJPT, E2-C2, ADV, & IUT Eng-07
Electrical
B.
AC power system: consists of two identical 26/
Sg 2, fr 3
115 VAC, 400 Hz single phase inverters, two 26
(3 Overlays)
VAC buses, and two 115 VAC buses
Electrical System Block Diagram
1.
Power generation
a.
26 and 115 VAC power developed by
Overlay 1
two identical inverters powered by 28
Inverters
VDC essential services bus
b.
Each inverter has voltage and
frequency regulation and protection
circuits. The inverters are
interconnected for phase control, and
the first inverter to sense a satisfactory
DC input (18 +/- 1 volt) assumes a
master control function over both
inverters. With a satisfactory DC input
and AC output the inverters are
brought on line automatically
c.
Inverters are internally protected for
input or output faults
(1) Automatically reset when input
fault clears
(2) Require manual reset for output
fault
2.
Distribution
Overlay 2
26/115 VAC Essential Services
a.
26 and 115 VAC essential buses
Buses
provide power distribution for AC
Overlay 3
essential services
Nonessential Buses
b.
26 and 115 VAC nonessential buses
provide power distribution for
nonessential services
c.
When generator is off-line, 26 and 115
VAC nonessential buses are taken off-
line
Page 7-10
(8-03) Original
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