MIL-DTL-38195D
TABLE II. AC generator and exciter electrical values and limits. 1/ continued
Minimum
Nominal
Maximum
Units
Transient performance30/
31/
1/ See 3.10.1.
2/ See Table V, Test Number 4.
3/ The generator shall withstand operation at 7500 rpm for 5 minutes without damage.
4/ The temperature rise shall not exceed these stated values for the type class insulation (as defined in NEMA
Standard MG1), when measured by the resistance method.
5/ See Table V, Test Number 436 and Table VI.
6/ See Table V, Test Number 1.
7/ See Table V, Test Number 3.
8/ The resistance of each winding shall be as specified on the applicable drawing.
9/ Windings shall withstand the stated 60 Hz voltage applied for 1 minute.
10/ See Table V, Test Number 2.
11/ 10 times ceiling voltage
12/ Windings energized by the 28-volt DC control, cranking and battery charging systems
13/ Twice rated voltage +500 volts
14/ The generator and excitation system shall withstand a 5 second single phase line-to-line, single phase
line-to-neutral and symmetrical 3 phase short circuits applied to its output terminals, when operating at rated load,
without reduction of the dielectric strength to a point where it will not meet the requirements stated in Table II,
under dielectric strength.
15/ See Table V, Test Number 5 and Table VI.
16/ See Table V, Test Number 11 and Table VI.
17/ Maximum difference shall be not more than 5 percent under the condition of a single-phase, line-to-neutral,
unity PF load of 1/3 rated load (69 ampere) and no other load on the generator.
18/ See Table V, Test Number 15 and Table VI.
19/ See Table V, Test Number 12.
20/ The maximum allowable single harmonic shall not exceed 2 percent of the fundamental. The content shall be
measured line-to-line and line-to-neutral at no-load, one half-load and full load; at 0.8 power factor (PF) and 1.0
power factor. There shall be no discontinuities in the waveform when viewed on the oscilloscope.
21/ See Table V, Test Number 13.
22/ The voltage modulation for any load from no-load to rated load shall not exceed as specified herein.
23/ See Table V, Test Number 14 and Table VI.
24/ See Table V, Test Number 23.
25/ Phase rotation shall be A, Band C (L1, L2 and L3).
26/ See Table V, Test Number 9.
27/ The voltage at the end of the power cable (Type MS 90328-28) shall remain within a bandwidth as specified
herein.
28/ See Table V, Test Number 10 and Table VI.
29/ The voltage shall remain within a bandwidth as specified herein.
30/ See Table V, Test Number 9.
31/ Performance of the set under transient conditions (as measured by magnetic oscillograph) shall be as follows:
a. With the set initially operating at no-load, rated voltage and rated frequency, the rms voltage (at
the end of the power cable) shall not drop to less than 75 percent of no-load voltage, (rated
voltage) when a balanced 3 phase, 0.8 PF (lagging) rated load is suddenly applied to the power
cable. When connected to the specified load, the set shall recover to and remain within a
bandwidth of 2 percent of rated voltage in not more than 0.5 seconds.
b. The requirements of (a) above shall also apply when the load is suddenly changed from rated load
to no-load except that the initial voltage transient shall not exceed 125 percent of rated voltage.
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