ABB REL670 2.2 IEC - Page 586

Furthermore the other build-in protection elements can be used for other protection
and alarming purposes.
0.2 0.4 0.6
-0.2
0.6
0.8
0.8
1
D
ILowSet
B
A
C
0.4
0.2
0
1.2
1.4
-0.4
-0.6
-0.8
-rca
Operating Region
Q [pu]
P
[pu]
rca
U
PS
I
PS
ILowSet
Operating region
en05000535.vsd
IEC05000535 V2 EN-US
Figure 293: Loss of excitation
Section 12 1MRK 506 369-UEN B
Multipurpose protection
580 Line distance protection REL670 2.2 IEC
Application manual