MIL-DTL-24765A(NAVY)
3.2.2.9 Output phase displacement (AC output). For three-phase UPS, the output voltage displacement angle
between adjacent voltage phases shall be not greater than 120±1 degrees under any load conditions between no-load
and rated-load, 0.8 lagging p.f., and input power as specified in 3.2.1.
3.2.2.10 Output voltage balance under balanced load conditions (AC output). For the three-phase UPS, the
difference between phase voltages shall be not greater than 1.0 percent of the rated voltage with any balanced load
from no-load up to rated-load with any p.f. between 0.7 lagging and 0.9 leading.
3.2.2.11 Output voltage balance under unbalanced load conditions (AC output). For the three-phase UPS, the
voltage variation between phases shall be not greater than ±2 percent of rated voltage with the load conditions
shown in table I.
TABLE I. Unbalanced loads.
Line A (percent of
Line B (percent of
Line C (percent of
Load conditions
Power factor
rated current)
rated current)
rated current)
1
90
75
75
0.7 lagging to unity
2
75
90
75
0.7 lagging to unity
3
75
75
90
0.7 lagging to unity
4
15
15
0
0.7 lagging to unity
3.2.2.12 Voltage regulation (DC output). The value of the output voltage shall be maintained within ±3 percent
of the rated output voltage under the following variable conditions and any combination thereof:
a.
A load variation from no-load to 125 percent load.
b.
Any input power perturbations within the range specified in 3.2.1.1.
c. Variation of the UPS temperature from a cold start to maximum operating temperature over the ambient
temperature range of 0 to 50 °C.
d.
With batteries supplying 100 percent of rated UPS power for the specified time (see 3.2.3.2).
e.
When batteries are recharged as specified in 3.2.9.
3.2.3 Ratings. The output ratings of the UPS shall be from 1 up to and equal to 100 kilowatts, as specified (see
3.2.3.1 Duty. The UPS shall have a continuous duty rating under any operating condition specified herein.
3.2.3.2 Operating time. The UPS shall have an operating time on battery of 10, 15, 20, 30, 45, or 60 minutes,
as specified (see 6.2).
3.2.4 Efficiency. With the UPS operating under the conditions specified in 4.6.23, the overall efficiency shall
be not less than 90 percent.
3.2.5 Over current protection. The UPS shall provide over current protection as follows:
a.
125 percent of rated current at rated output voltage for 10 minutes (see 3.2.1).
b.
200 percent of rated current at rated output voltage for 30 seconds (see 3.2.1).
c.
200 to 230 percent of rated current at rated output voltage for 5 seconds (see 3.2.1).
d. Output over 230 percent of rated current is considered short circuit. For short circuit, the UPS shall limit
the current to a minimum of 230 percent at reduced output voltage for 5 seconds.
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