MIL-PRF-27/349C
Electrical characteristics:
Rated load: With rated voltage across the primary at 400 Hz, the voltage across each winding of
the secondary, wye connected, shall be as specified in Table I within ±5 percent at the current
specified in TableI.
Regulation: Shall not exceed 10 percent when computed as follows:
Voltage (no load ) Voltage (rated load )
x 100
Voltage (rated load )
TABLE I. Electrical ratings - secondary.
Wye (L-Com) 4 wire 3/
Wye (L-Com) 4 wire 1/
Dash
DC resistance 1/
Delta (L-L) 3 wire 2/
(each winding)
Wye (L-Com)
numbers
(each winding)
(each winding)
M27/349-
Load current
Load current
Volts
Amperes
Volts
Amperes
Ohms ±25%
rms
rms
rms
rms
01, 07, 13
.0118
12
10.42
20.8
6.02
02, 08, 14
.0189
15
8.34
26.0
4.82
03, 09, 15
.0310
20
6.25
34.6
3.61
04, 10, 16
.0648
28
4.47
48.5
2.58
05, 11, 17
.176
48
2.61
83.1
1.51
06, 12, 18
1.07
115
1.09
200
0.63
1/ Wye, line to common, connect (6-8-10), load (5-6), (7-6), and (9-6).
2/ Delta, line to line, connect (6-7), (8-9), and (5-10), load (5-7-9).
3/ Wye, line to line, connect (6-10), (8-10), load (5-7-9).
DC resistance (dash numbers 01 through 06):
Primary:
(1-4): 0.85 ohms ±25 percent.
(2-4): 0.85 ohms ±25 percent.
(3-4): 0.85 ohms ±25 percent.
DC resistance (dash numbers 07 through 12):
Primary:
(1-2): 0.57 ohms ±25 percent.
(2-3): 0.57 ohms ±25 percent.
(3-1): 0.57 ohms ±25 percent.
DC resistance (dash numbers 13 through 18):
Primary:
(1-2): 1.57 ohms ±25 percent.
(2-3): 1.57 ohms ±25 percent.
(3-1): 1.57 ohms ±25 percent.
4
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