MIL-HDBK-1004/5
Table 11
400-Hz Central Plant Sizing
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1. To Supply Required Minimum 400-Hertz Output (Firm) Capacity of 766 kVA
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Individual Motor Generator
No. of Units
Total Output
Output Rating
Provided
312 kVA
3
936 kVA
250 kVA
4
1,000 kVA
219 kVA
4
876 kVA
187 kVA
5
935 kVA
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2. Number of Units Required to Supply 766-kVA Firm Capacity Plus Standby
Capacity
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Individual
Required
Total Plant
Output Rating
No. of Units
Capacity
312 kVA
3+1
1,248 kVA
250 kVA
4+1
1,250 kVA
219 kVA
4+1
1,095 kVA
187 kVA
5+1
1,122 kVA
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3. Plant Size Evaluations
Rating (1)
187-kVA
219-kVA
250-kVA
312-kVA
Evaluations
Unit
Unit
Unit
Unit
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Capital Cost
Most (1)
Median (2)
Median (2) Least (3)
Floor Space
Most (1)
Median (2)
Median (2) Least (3)
Available Output
Median (2)
Least (1)
Most (3)
Median (2)
Flexibility
Best (3)
Median (2)
Median (2) Least (1)
Complexity
Most (1)
Median (2)
Median (2) Best (3)
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Overall Rating
Lowest (8)
Lowest (9)
Median (11) Best (12)
(1) Based on (1) to (3) points with 3 points being the best rating.
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4. Plant Size Selection
Use four (4) 312-kVA units, as that plant size has the best overall
rating.
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4.3.3.3
Generator Source. When diesel-engine generation is necessary to
provide an alternative source, give pertinent data in the Basis for Design.
For diesel-engine generator selection, see MIL-HDBK-1003/11, Diesel-Electric
Generating Plants.
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