MIL-DTL-24765A(NAVY)
c.
Any input power perturbations within the range specified in 3.2.1.1.
d. Variation of the UPS temperature from a cold start to maximum operating temperature over the ambient
temperature range of 0 to 50 degrees Celsius (°C).
e.
Under the unbalanced load condition specified in 3.2.2.11.
f.
Under the nonlinear load conditions specified in 3.2.2.2.
g.
With batteries supplying 100 percent of rated UPS power for specified time (see 3.2.3.2).
h.
When batteries are charging as specified in 3.2.9.
3.2.2.2 Steady-state nonlinear load (AC output). When a typical nonlinear load (see 6.4.2) up to 50 percent of
the rated load is applied, the UPS shall meet the following:
a.
The output voltage waveform shall remain within the limits specified in 3.2.2.8.
b.
The voltage amplitude modulation shall be as specified in 3.2.2.7.
The maximum harmonic content in the UPS output current shall be in accordance with the following formula:
IN = 100/N percent of fundamental current
IN is the Nth harmonic current and N is the harmonic number. N shall not be an even integer or multiple of
three.
3.2.2.4 Transient output voltage and recovery (AC output). The sudden change of 0.8 lagging power factor
loads on the UPS from no-load to ½-load, from ½-load to rated-load and from rated-load to ½-load, and from ¾-load
to ¼-load shall cause an output voltage deviation of not greater than ±5.0 percent of rated voltage. The voltage at
the UPS output terminals shall recover and stay within the steady-state regulation band (see 3.2.2.1) within 5
milliseconds. Voltage transients developed within the UPS shall not reflect back into the input power system so that
transient limits for alternating current (AC) are not greater than the input Type I power in accordance with
MIL-STD-1399, Section 300.
3.2.2.5 Frequency regulation (AC output). Output frequency shall be maintained within ±1 percent of rated
frequency under the following conditions and any combination thereof:
a.
Any input power perturbations within the range specified in 3.2.1.1.
b. Variation of the UPS temperature from cold start to maximum operating temperature over the ambient
temperature ranging from 0 to 50 °C.
c. Any input voltage and frequency variation outside the range specified in 3.2.1. The storage battery shall be
charged and the UPS shall supply output power for the specified time (see 3.2.3.2).
d.
A load variation from no-load to 125 percent load.
e.
Load power factor (p.f.) varying between 0.7 lagging and 0.9 leading with rated output.
f.
Under the unbalanced load condition specified in 3.2.2.11.
g.
Under the nonlinear load conditions specified in 3.2.2.2.
h.
With batteries supplying 100 percent of rated UPS power for specified time (see 3.2.3.2).
i.
When batteries are charging as specified in 3.2.9.
3.2.2.6 Isolation. The UPS shall provide electrical isolation of the input from the output.
3.2.2.7 Amplitude and frequency modulation (AC output). Amplitude and frequency modulation of the output
voltage (as defined in MIL-STD-1399, Section 300) shall not exceed 1 percent and 0.5 percent, respectively, under
any condition of operation specified herein.
3.2.2.8 Output voltage waveform (AC output). Under any load conditions between no-load and rated-load, 0.8
lagging p.f., and input power as specified in 3.2.1 or during the loss of input power, the total harmonic distortion of
the output voltage shall not exceed 5 percent. The rms value of any single harmonic shall not exceed 3 percent of
the rms value of the rated output voltage. Peak-to-peak amplitude of voltage spikes (between the phases) of any
frequencies shall be not greater than 3 percent of the rms value of the rated output voltage.
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