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MIL-DTL-28778 Transformer, Power, Stepup, 3 PhaseThis specification covers the requirements for a high power transformer, using single unit, 3- legged core construction, supplying rectified loads to be used in Navy shore transmitters. These units are sealed, metal encased with either separately fabricated headers and terminals or both.

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MIL-DTL-28778A
FIGURE 2. Electrostatic-shielding circuit.
4.6.3.1 Torque.
4.6.3.1.1  Screw-thread terminals. Transformers shall be tested in accordance with method 211 of
4.6.4 Dielectric withstanding voltage (see 3.8). Transformers shall be tested in accordance with 4.6.4.1.
4.6.4.1 Points of application of test voltage:
(a) Primary winding shall withstand test voltage of 2,500 VRMS between terminals and case
(b) Secondary winding shall be grounded to case for this test.
(1) Secondary number 1 winding shall withstand a test voltage of 20,100 VRMS between its
terminals and case. The primary and secondary number 2 windings shall be grounded to
the case for the test.
(2) Secondary number 2 winding shall withstand a test voltage of 5,000 VRMS between its
terminals and case. The primary and secondary number 1 windings shall be grounded to
the case for the test.
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