MIL-DTL-917F(SH)
yy. The user equipment interface requirements for medium voltage DC powered equipment or are to be in
accordance with IEEE 1709 (see 3.19.1.1).
zz. High voltage input power variations for AC equipment (Class I, II, and III power of MIL-STD-1399-680
applies unless otherwise specified) (see 3.19.1.2).
aaa. Use of Navy-approved vacuum type circuit breakers (see 3.19.4.1).
bbb.Alternatives to medium voltage potential transformers (see 3.19.8).
ccc. If partial discharge detection maintenance equipment is required and the required minimum detectible
partial discharge inception voltage level (see 3.19.9.1).
ddd.Specify if VDS or VPIS is required (see 3.19.9.2).
eee. IA requirements (see 3.20).
fff. Examination, tests, and sampling (see 4.1).
ggg.Level of manufacturing screening testing (see 4.3.1).
hhh.After which tests the dielectric withstand voltage test should be conducted (see 4.4.1).
iii. When insulation system is to be tested for moisture resistance (see 4.4.2.2).
jjj. Non-QPL qualified transformers and inductors requirements (see 4.5).
kkk.If temperature measurement by embedded detectors is to be used and location of embedded detectors
lll. Method of temperature measurement (see 4.6.3.3).
mmm. How ambient temperature is to be measured in equipment cooled by water (see 4.6.3.3.3).
nnn.How ambient temperature is to be measured in equipment cooled by oil (see 4.6.3.3.4).
ooo.Packaging requirements (see 5.1).
6.3 Provisioning. Provisioning Technical Documentation (PTD), spare parts, and repair parts should be
furnished as specified in the contract. When ordering spare parts or repair parts for the equipment covered by this
specification, the contract should state that such spare parts and repair parts should meet the same requirements as
the parts used in the manufacture of the equipment.
6.4 Alternate approval method for low quantity and non-QPL qualified transformers and inductors. The
procedures below will be accepted as sufficient quality assurance in order to use the non-QPL qualified transformers
and inductors.
6.4.1 Similarity process. Establishment of acceptability is based upon similarity to a previously approved and
tested design by the same manufacturer under MIL-PRF-27. A given design may be established as similar without
testing the units when the purchaser is satisfied that the unit compares as follows with a single unit with tested and
approved mechanical design characteristics:
a.
Same grade; same class of operation.
b. Same external and internal mounting; similar shape; same case construction; nominal wall thickness within
25 percent when a case is used; linear dimensions not greater than 150 percent nor less than 70 percent of the
corresponding dimensions; total volume is not greater than 250 percent.
c. Same terminal construction and material, including insulating and gasketing parts; same or larger size for
corresponding terminals; same or greater spacing between terminals and between terminals and the case wall or
other grounded surfaces.
d.
Same or greater wire size and same coating material for corresponding winding.
e.
Same processing and material for case, finish marking, potting, insulating, and impregnating.
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