ABB REC670 Applications Manual page 274

Section 11
Multipurpose protection
268
Furthermore the other build-in protection elements can be used for other protection
and alarming purposes.
Q [pu]
A
0.8
0.6
0.4
0.2
0
0.2 0.4 0.6
-rca
-0.2
-0.4
ILowSet
D
Operating Region
-0.6
-0.8
IEC05000535 V2 EN-US
Figure 101: Loss of excitation
B
P
1
0.8 1.2 1.4
[pu]
C
1MRK 511 401-UEN A
Operating region
ILowSet
I
PS
rca
U
PS
en05000535.vsd
Bay control REC670 2.2 IEC
Application manual