MIL-DTL-3124E(SH)
3.3.26.4 Drain plugs. Drain plugs, in accordance with MIL-E-2036, shall be provided to properly drain the
generator.
3.3.27 Cylindrical rotor field. The cylindrical rotor field shall be as specified in 3.3.24 through 3.3.26.4 (except
for 3.3.24.3, 3.3.24.4, and 3.3.25 through 3.3.25.2). In addition, cylindrical rotors shall be as specified in 3.3.27.1
and 3.3.27.2.
3.3.27.1 Field coils. Field coils of non-salient-pole generators shall be form-wound (see 3.3.24.1) before
assembly in the core slots, and shall be interchangeable. Field coils shall be secured by slot wedges. The end turns
shall be bound with resin treated glass tape in accordance with MIL-E-917, or one-piece shrink-on steel retaining
rings as approved by NAVSEA.
3.3.27.2 Slot wedges. Aluminum or beryllium copper slot wedges may be used when high rotational speed and
large mass in the rotating element introduce height stresses due to centrifugal force as determined by the
manufacturer. Slot wedges shall form a continuous circuit to function as a damper or amortisseur winding.
3.4.1 Operating life. The generator shall operate satisfactorily over an operating life of not less than
150,000 hours. The life shall be predicated on 20,000 hours at rated-load; 90,000 hours at 60 percent rated-load; and
40,000 hours at 40 percent rated-load. The generator shall withstand not less than 100,000 start/stops during its
operating life.
3.4.2 Reliability prediction. The reliability prediction of the generator shall be based on the failure rate of
parts, and shall be as specified (see 3.4.1 and 6.2). The inherent mean-time-between-failure (MTBF) of the
generator shall be not less than 25,000 hours and the mean-time-to-repair (MTTR) for the generator shall be not
greater than 12 hours, assuming that the repair parts are available aboard the ship (see 6.2).
3.4.3 Airborne and structureborne noise. When special noise reduction limitations are not applicable
(see 3.3.23), the generator airborne noise shall not exceed levels in accordance with Steady State Noise Category B
of MIL-STD-1474.
3.4.4 Power output ratings. Unless otherwise specified (see 6.2), generators shall have the following power
output kilowatt ratings based on 80 percent lagging power factor (p.f.):
Kilowatt ratings
30
1,000
60
1,500
100
2,000
200
2,500
300
3,000
500
4,000
750
8,000
The kilowatt rating shall be the net power for continuous use. If the generator has any auxiliary equipment, such as
a static excitation system that receives power from the generator and functions as an essential part of the basic
generator set, the generator shall have capacity in excess of the net power rating to furnish this power. Such
capacity shall be the gross kilowatt rating.
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