MIL-DTL-917F(SH)
APPENDIX A
TABLE A-I. Specimens for insulation suitability test.
Equipment
Form to be
Sample
Equipment
Suggested size and type
specification
tested
quality
MIL-DTL-17060
AC integral horsepower
Stator winding
3
10 hp, 215 frame. 3-phase
(hp) motors
induction type
MIL-M-17059
AC fractional hp motors
Motor
3
¼ hp, single-phase
MIL-G-3124
AC generators
Armature coil
3
Any size over 50 kw
Field coil
3
MIL-G-3111 (for
DC generators
Armature coil
3
Any size over 50 kw
guidance only)
Field coil
3
MIL-M-17413 (for
DC integral hp motors
Motor
3
5 hp, shunt
guidance only)
MIL-T-15108
60 Hz transformers
Transformer
3
7.5 kVA single-phase
450/120
MIL-M-17556 (for
DC fractional hp motors
Motor
3
¼ hp, shunt
guidance only)
AC propulsion motors and
Armature and
3 each
Any size
generators
field coil
MIL-G-18473 (for
DC propulsion motors and
Armature and
3 each
Any size
guidance only)
generators
field coil
MIL-T-17221
400 Hz transformer
Transformers
3
Any size
MIL-DTL-2212
AC controller
Shunt coil
3
Any size
DC controller
Shunt coil
3
Any size
NOTES:
1. Partial windings submitted for test shall receive all the insulation processing that the final assembly of the
equipment would receive so as to represent the complete winding.
2. When testing armature, field, or shunt coils, metal foil electrodes shall be used to simulate ground
connections.
A.5.2 Test equipment needed. The following test equipment shall be provided:
a.
Humidity chamber
b.
High potential test equipment
c.
Insulation resistance test bridge
d.
Capacitance test bridge
e.
Ohmmeter
A.5.3 Type of test equipment.
A.5.3.1 Humidity chamber. This box shall be made of steel, or a transparent plastic film, having a low
moisture permeability, and shall be placed over a steel framework. The top of the chamber shall be slanting or
peaked (or otherwise arranged) so that the excess condensate does not drip on the equipment. The relative humidity
shall be maintained at 100 percent at a temperature of 87.8±3.6 °F (31±2 °C). The humidification shall be sufficient
to produce minute droplets of condensate on the insulation surfaces of the equipment under test. However, the
amount of condensate shall be controlled so as not to produce puddles or streams of water on the insulation surfaces.
Equipment such as a motor, not open for free circulation of air, shall have one end-bracket removed to permit free
access of the humidified air to all parts of the winding.
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