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|  MIL-E-7016F
Source interval rating. The source interval rating is the interval
6.2.5.3
rating of a unit power source multiplied by the number of units operating in parallel.
Adjusted source capacity. The adjusted source capacity is the
6.2.5.4
maximum power output capacity of a power source (system) when it is operated
under specified conditions. It is the product of the composite rating factor multiplied
by the source interval rating factor of the system.
Growth Capacity. Growth capacity is a measure of the power
6.2.6
source capacity available in an aircraft electric system to supply future load equip-
ment. This value is expressed in terms of percent of source capacity and shall be
no less than the percentages specified in the aircraft detail specification.
Growth capacity of a primary system. Growth capacity of a
6.2.6.1
primary system is calculated as indicated in 6.3.4.
6.2.6.2
Growth capacity of a secondary system. Growth capacity of a
secondary system is equal to the quotient of the adjusted secondary source capacity
minus the existing secondary system load divided by the adjusted source capacity,
the quantity multiplied by 100. The result of this calculation shall appear on the
summary of the system analysis sheet.
Sample calculations.
6.3
Ac load analysis calculations.
6.3.1
Volt amperes (VA) = (watts2 + vars2)1/2
6.3.1.1
Formulas:
Power factor (p.f.) = W/VA, W = watts
(Max phase VA - Min phase VA) x 100
Percent phase load unbalance =
Adjusted source phase VA rating
6.3.1.2
Sample load analysis calculation.
volt amperes
Watts
Vars
Power factor
4,600
0.855
2,400
Phase A
3,930
0.826
5,000
4,130
2,820
Phase B
0.838
4,830
4,050
2,640
Phase C
Adjusted Source Capacity = 30 kVA
Max Phase VA
5000
-Min Phase VA -4600
400
20
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