MIL-DTL-3124E(SH)
3.3.13.2 Generators with frame sizes larger than 100 kilowatts at 1200 r/min. For generators with frame sizes
larger than that corresponding to 100 kilowatts at 1200 r/min, end brackets and air seals shall be split on the
horizontal centerline to permit access to the generator windings and internal parts for inspection and cleaning
without uncoupling the prime mover.
3.3.14 Lifting means. Eyebolts or other means shall be provided for lifting any generator component weighing
50 pounds or more.
3.3.15 Vertical adjustment. Jackscrews shall be used to facilitate vertical adjustment of generator frames
weighing 1,000 pounds or more. Jackscrews shall be used only for installation purposes.
3.3.16 Access holes. For generators over 500 kilowatts, access holes shall be placed in each shield to allow
inspection of nearby internal parts.
3.3.17 Excitation and regulation system. The excitation and regulation system shall be as specified in 3.3.17.1
through 3.3.17.2.1.
3.3.17.1 Automatic voltage regulator and exciter system. A combined automatic voltage regulator and exciter
system shall be provided as part of the generator equipment. The combined automatic voltage regulator and exciter
system shall be in accordance with Type II of MIL-R-2729, as modified by applicable equipment specifications. No
brushes or slip rings shall be used.
3.3.17.2 Rotating exciters. The requirements of this specification regarding generators apply to rotating
exciters except for exciter mounting (see 3.3.17.2.1).
3.3.17.2.1 Exciter mounting. The exciter shall be mounted so that it does not interfere with the accessibility of
the main generator windings for inspection and cleaning. The output of the rotating rectifier assembly shall be
directly connected by leads that run through the shaft to the main generator field. The exciter armature and rotating
rectifier assembly shall be removable from the shaft.
3.3.18 Field discharge resistors. Field discharge resistors shall be prohibited.
3.3.19 RTEs. Generators rated 300 kilowatts and larger shall be provided with RTEs on generator sleeve
bearings and generator stator windings for detecting the temperature of generator cooling air where totally enclosed
water-air-cooled generators are specified (see 3.3.26). RTEs shall connect with monitors which are in accordance
with MIL-T-15377.
3.3.19.1 Generator air temperature. Two RTEs shall be provided to measure generator air temperature. One of
the RTEs shall be located so as to measure the temperature of air inlet to the generator air cooler and the other
located so as to measure the temperature of the air outlet from the generator air cooler. Air temperature RTEs shall
be removable without the removal of the complete air cooler cover.
3.3.19.2 Generator stator windings. Not less than two embedded RTEs per phase shall be provided in the stator
winding, with the first placed at the estimated hot spot of the machine winding, and the remainder spaced at equal
intervals around the stator.
3.3.19.3 Generator sleeve bearings (for submarine ship service application only). Sleeve bearings shall be
fitted with RTEs at the full power load line. One RTE in each sleeve bearing shall be located in the middle third of
the axial length of the bearing. The RTEs shall be in accordance with MIL-T-24388, with element wiring
protruding from the bottom or ending at the bottom.
3.3.19.3.1 RTE installation. The RTEs shall be installed in a radial hole in the bearing shell, with the sensing
tip /16 inch below the bearing surface and with the bottom of the RTE casing bottoming on the shoulder in hole.
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