7. Set parameter
ROADir
to value 90 degree
8. Set parameter
LowVolt_VM
to value 5%
9. Enable one overcurrent step (for example, OC1)
10. Select parameter
CurveType_OC1
to value
IEC Def. Time
11. Set parameter
StartCurr_OC1
to value 38%
12. Set parameter
tDef_OC1
to value 2.0s (typical setting)
13. Set parameter
DirMode_OC1
to
Forward
14. Set parameter
DirPrinc_OC1
to
IcosPhi&U
15. Set parameter
ActLowVolt1_VM
to
Block
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
85 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
U
PS
I
PS
ILowSet
Operating region
en05000535.vsd
IEC05000535 V2 EN-US
Figure 85: Loss of excitation
1MRK 511 358-UEN A Section 10
Multipurpose protection
211
Application manual
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