ABB REG316 4 Series - Page 247

REG 316*4 1MRB520049-Uen / Rev. F ABB Switzerland Ltd
3-209
105
110
115
120
125
130
135
140
t-max
.1 .2 .5 1.0 2
510
20 50
Time in minutes
HEST 935 024 C
t-min
145
150
.3 .4
34 6789
40
30
60
%
[VB/fN]
V/f-Setting
A
pproximation
according to table
Permissible short-time
overfluxing
Fig. 3.5.21.1 Example of an overfluxing curve
100
110
120
130
140
Applications for Power Transformers (IEEE C37.91-1985)
0.01 1.0 10 100 1000
Minutes
HEST 935 025 C
90
150
0.1
Data on overfluxing lim its must be
requested from the various suppliers
1
2
3
%
V
O
L
T
H
z
/
S
Fig. 3.5.21.2 Transformer overfluxing limits of three manufac-
turers