ABB REL670 2.2 IEC Applications Manual page 557

1MRK 506 369-UEN B
Line distance protection REL670 2.2 IEC
Application manual
Table 42: Settings
U/f op (%) Timer
105 t1
112 t2
119 t3
126 t4
133 t5
140 t6
Information on the cooling time constant T
transformer manufacturer.
V/Hz
%
150
140
130
120
110
100
0.05 0.1 0.2 0.5
t6 t5 t4
IEC01000377 V1 EN-US
Figure 290: Example on overexcitation capability curve and V/Hz protection
settings for power transformer
Time set (s)
7200 (max)
600
60
20
8
4
should be retrieved from the power
cool
transformer capability curve
relay operate characteristic
1 2 5 10
t3 t2
Section 10
Voltage protection
Continous
20 50 100 200
(minutes)
t1
en01000377.vsd
Time
551