ABB REL670 2.2 IEC - Page 557

Table 42: 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 290: Example on overexcitation capability curve and V/Hz protection
settings for power transformer
1MRK 506 369-UEN B Section 10
Voltage protection
Line distance protection REL670 2.2 IEC 551
Application manual