ABB REG316 4 Series Operating Instructions Manual page 247

REG 316*4 1MRB520049-Uen / Rev. F
%
150
[VB/fN]
145
140
135
130
125
120
115
V/f-Setting
110
105
.1 .2
t-min
Fig. 3.5.21.1 Example of an overfluxing curve
Applications for Power Transformers (IEEE C37.91-1985)
150
3
140
%
130
V
O
L
T 120
S
/
H
110
z
100
Data on overfluxing limits must be
requested from the various suppliers
90
0.01 0.1
Fig. 3.5.21.2 Transformer overfluxing limits of three manufac-
turers
Permissible short-time
overfluxing
.5 1.0 2
.3 .4
3
1
2
1.0
Minutes
ABB Switzerland Ltd
Approximation
according to table
20 40
30
4 5 6 7 8 9 10
Time in minutes
HEST 935 024 C
10 100
HEST 935 025 C
50 60
t-max
1000
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