MIL-HDBK-1004/5
Minimum Required Capacity (1) = (80 percent x 766 kVA) + 50 kVA
663 kVA
Nearest larger standard transformer size is 750 kVA
Therefore, provide two 750 kVA transformers.
If one transformer is shut down, 100 percent of the 633-kVA demand can
still be supplied, while if 500-kVA units were supplied only 75 percent
(less than the required 80 percent of demand) could be provided.
(1) Assuming an additional 50-kVA, 60-hertz demand.
Table 10
400-Hz Load Calculations
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1. Aircraft Maximum Loads
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Hangar
Aircraft
Hangar
No.
Average
Loads
Type
Quantity
Simultaneous Load
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1
F-14A
24
13.5 kVA
324 kVA
2
F-14A
24
13.5 kVA
324 kVA
3
F-14A
12
13.5 kVA
152 kVA
4
F-14A
18
13.5 kVA
243 kVA
5
F-4J
4
23.5 kVA
94 kVA
6
E-2C
5
70.1 kVA
351 kVA
Total Aircraft Loads
1,488 kVA
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2. Avionic Connected Loads
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Versatile Avionic Shop Tester Stations, 6 at 13.5 kVA
81 kVA
Shop Load from Using Agency
102 kVA
Connected Avionics Loads
183 kVA
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3. Miscellaneous Connected Loads from Using Agency
404 kVA
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4. Demand Loads
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Maximum or
Demand
Type
Connected Load
Factor
Demand
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Aircraft
1,488 kVA
0.25
372 kVA
Avionics
183 kVA
0.50
92 kVA
Miscellaneous
404 kVA
0.50
202 kVA
Demand Load
666 kVA
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5. Minimum 400-Hertz Central Plant Output Capacity Required
666 kVA x 1.15 percent = 766 kVA
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