ABB RET670 - Page 570

Proper operation of the CVGAPC function made in this way can easily be verified by
secondary injection. All other settings can be left at the default values. However it shall
be noted that set values for RCA & ROA angles will be applicable for OC2 step if
directional feature is enabled for this step as well. Figure
221 shows overall protection
characteristic
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
V
PS
I
PS
ILowSet
Operating region
en05000535_ansi.vsd
ANSI05000535 V1 EN
Figure 221: Loss of excitation
Section 3 1MRK504116-UUS C
IED application
564
Application manual