ABB REG670 - Page 430

Table 47: 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
Figure 209: Example on overexcitation capability curve and V/Hz protection
settings for power transformer
Section 10 1MRK 502 071-UEN -
Voltage protection
424 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual