ABB REB670 Applications Manual page 289

1MRK 505 370-UUS A
Busbar protection REB670 2.2 ANSI
Application manual
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
ANSI05000535 V1 EN-US
Figure 113: Loss of excitation
ILowSet
B
P [pu]
1
0.8 1.2 1.4
C
Section 10
Multipurpose protection
Operating region
I
PS
rca
V
PS
en05000535_ansi.vsd
283