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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
Table I. Primary terminal numbers
Phase
Winding
No. 1
No. 2
A
1, 4, 7, 10, 13, 16
19, 22, 25, 28, 31, 34
B
2, 5, 8, 11, 14, 17
20, 23, 26, 29, 32, 35
C
3, 6, 9, 12, 15, 18
21, 24, 27, 30, 33, 36
3.6.1.1 Input voltages. The input voltages shall be 460/230 volts RMS ± 10 percent, 3-phase delta
connected.
3.6.1.2 Primary taps. Each winding of the primary shall have ± 5 percent and ± 10 percent taps.
3.6.1.3 Frequency. The frequency shall be 50/60 Hertz (Hz) ± 5 percent.
3.6.1.4 Working voltage. The primary winding to ground shall be 780 volts peak.
Secondary number 1. Terminals R1, R2, R3 and R0.
3.6.2
3.6.2.1 Transformer impedance. The impedance from primary to secondary No. 1 shall be no
greater than 10 percent.
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