Table 19:
Settings
U/f op (%)
Timer
Time set (s)
105
t1
7200 (max)
112
t2
600
119
t3
60
126
t4
20
133
t5
8
140
t6
4
Information on the cooling time constant T
cool
should be retrieved from the power
transformer manufacturer.
1
2
5
50
200
110
120
130
140
150
100
0.05
0.1
0.2
0.5
10
20
100
V/Hz
%
Continous
Time
(minutes)
t6
t5
t4
t3
t2
t1
transformer capability curve
relay operate characteristic
en01000377.vsd
IEC01000377 V1 EN-US
Figure 62:
Example on overexcitation capability curve and V/Hz protection
settings for power transformer
1MRK 504 169-UEN A
Section 8
Voltage protection
Transformer protection RET650 2.2 IEC
161
Application manual
Содержание ret650
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