MIL-PRF-27/347C
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 1/
Wye (L-Com) 4 wire 3/
Dash
DC resistance 1/
Delta (L-L) 3 wire 2/
(each winding)
numbers
Wye (L-Com)
(each winding)
M27/347-
(each winding)
Load current
Load current
Volts
Amperes
Volts
Amperes
Ohms ±25%
rms
rms
rms
rms
.00447
01, 08, 15
5
13.34
8.66
7.70
02, 09, 16
.0210
12
5.56
20.8
3.21
.0333
15
4.45
26.0
2.57
03, 10, 17
04, 11, 18
.0699
20
3.34
34.6
1.93
.124
28
2.38
48.5
1.38
05, 12, 19
06, 13, 20
.424
48
1.39
83.1
0.81
07, 14, 21
2.04
115
0.58
200
0.34
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).
Efficiency (at rate load): Shall be a minimum of 90 percent when computed as follows with
secondary connected wye, L-com
(Secondary voltage) (Secondary current)
X 100
(Primary phase voltage) (Primary phase current)
DC resistance (dash numbers 01 through 07):
Primary:
(1-4): 1.68 ohms ±25 percent.
(2-4): 1.68 ohms ±25 percent.
(3-4): 1.68 ohms ±25 percent.
DC resistance (dash numbers 08 through 14):
Primary:
(1-2): 1.11 ohms ±25 percent.
(2-3): 1.11 ohms ±25 percent.
(3-1): 1.11 ohms ±25 percent.
4
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