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Moeller Wiring Manual > Standards, formulae, tables > Conductors > Rated operational currents and short-circuit currents for standard transformers
Standards, formulae, tables
Conductors

Rated operational currents and short-circuit currents for standard transformers [t-head1-pg]

Rated voltage
         
   
400/230 V
         
525 V
       
690/400 V
       
Un
 
 
       
 
       
 
       
Short-circuit voltage UK
 
 
 
4 %
 
6 %
 
 
 
4 %
 
6 %
 
 
4 %
 
6 %
Rating
 
Rated current
 
Short-circuit current
     
Rated current
 
Short-circuit current
   
Rated current
 
Short-circuit current
   
 
In
IK’’
 
In
 
IK’’
 
In
IK’’
 
kVA
A
A
A
A
 
A
A
A
A
A
50
 
72
 
1967
 
–
 
55
 
1498
 
–
 
42
 
1140
 
–
63
91
2478
1652
69
 
1888
1259
53
1436
958
100
144
3933
2622
110
 
2997
1998
84
2280
1520
125
180
4916
3278
137
 
3746
2497
105
2850
1900
160
231
6293
4195
176
 
4795
3197
134
3648
2432
200
289
7866
5244
220
 
5993
3996
167
4560
3040
250
361
9833
6555
275
 
7492
4995
209
5700
3800
315
455
12390
8260
346
 
9440
6293
264
7182
4788
400
577
15733
10489
440
 
11987
7991
335
9120
6080
500
722
19666
13111
550
 
14984
9989
418
11401
7600
630
909
24779
16519
693
 
18879
12586
527
14365
9576
800
1155
–
20977
880
 
–
15983
669
–
12161
1 000
1443
–
26221
1100
 
–
19978
837
–
15201
1 250
1804
–
32777
1375
 
–
24973
1046
–
19001
1 600
2309
–
41954
1760
 
–
31965
1339
–
24321
2 000
2887
–
52443
2199
 
–
39956
1673
–
30402
2500
3608
–
65553
2749
 
–
 
49945
 
2092
 
–
 
38002
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