MIL-HDBK-1133
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APPENDIX D
TRANSMISSION LOSSES
Table D-1
Individual Transformer Losses by Size
Voltage
Loss (W)
No. of
Capacity
Phases
(kVA)
Primary
Secondary
No-Load
Load
1
2400/4160Y
120/240/277/480
5
34
103
1
2400/4160Y
120/240/277/480
10
68
136
1
2400/4160Y
120/240/277/480
15
84
198
1
2400/4160Y
120/240/277/480
25
118
304
1
2400/4160Y
120/240/277/480
37.5
166
404
1
2400/4160Y
120/240/277/480
50
185
535
1
2400/4160Y
120/240/277/480
75
285
700
1
2400/4160Y
120/240/277/480
100
355
920
1
2400/4160Y
120/240/277/480
167
500
1600
1
2400/4160Y
120/240/277/480
250
610
2780
1
2400/4160Y
120/240/277/480
333
840
3360
1
2400/4160Y
120/240/277/480
500
1140
4600
1
7200/12,470Y
120/240/277/480
5
41
103
1
7200/12,470Y
120/240/277/480
10
68
136
1
7200/12,470Y
120/240/277/480
15
84
198
1
7200/12,470Y
120/240/277/480
25
118
304
1
7200/12,470Y
120/240/277/480
37.5
166
404
1
7200/12,470Y
120/240/277/480
50
185
535
1
7200/12,470Y
120/240/277/480
75
285
700
1
7200/12,470Y
120/240/277/480
100
355
920
1
7200/12,470Y
120/240/277/480
167
500
1600
1
7200/12,470Y
120/240/277/480
250
610
2880
1
7200/12,470Y
120/240/277/480
333
840
3415
1
7200/12,470Y
120/240/277/480
500
1140
4500
1
13,200/22,860GndY
120/240/277/480
5
42
112
1
13,200/22,860GndY
120/240/277/480
10
73
142
1
13,200/22,860GndY
120/240/277/480
15
84
221
1
13,200/22,860GndY
120/240/277/480
25
118
319
1
Although this table has value related to losses for older
existing transformers, it is not accurate for transformers
that the Navy has been procuring through NAVFAC guide
specifications such as NFGS-16272. The no load losses derived
from the NFGS are lower than those in this table. The load
losses for larger transformers derived from the NFGS are lower
than those in this table.
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