MIL-PRF-27/345C
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 Table I.
Regulation: 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/
DC resistance 1/
Dash
Delta (L-L) 3 wire 2/
(each winding)
numbers
Wye (L-Com)
(each winding)
(each winding)
M27/345-
Load current
Load current
Volts
Amperes
Volts
Amperes
Ohms ±25%
rms
rms
rms
rms
01, 08, 15
5
8.00
8.66
4.62
.0083
02, 09, 16
.0498
12
3.34
20.8
1.93
03, 10, 17
15
2.67
26.0
1.54
.0778
04, 11, 18
.130
20
2.00
34.6
1.16
05, 12, 19
.287
28
1.43
48.5
0.83
06, 13, 20
.782
48
0.84
83.1
0.49
07, 14, 21
4.75
115
0.35
200
0.20
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 rated 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): 4.05 ohms ±25 percent.
(2-4): 4.05 ohms ±25 percent.
(3-4): 4.05 ohms ±25 percent.
DC resistance (dash numbers 08 through 14):
Primary:
(1-2): 2.70 ohms ±25 percent.
(2-3): 2.70 ohms ±25 percent.
(3-1): 2.70 ohms ±25 percent.
4
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