ABB RELION 670 Series Applications Manual page 511

1MRK 505 343-UEN B
7. Set parameter
8. Set parameter
9. Enable one overcurrent step (for example, OC1)
10. Select parameter
11. Set parameter
12. Set parameter
13. Set parameter
14. Set parameter
15. Set parameter
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
Furthermore the other build-in protection elements can be used for other protection and
alarming purposes.
0.8
0.6
0.4
0.2
-0.2
-0.4
-0.6
-0.8
IEC05000535 V2 EN-US
Figure 305: Loss of excitation
Application manual
ROADir to value 90 degree
LowVolt_VM to value 5%
CurveType_OC1 to value IEC Def. Time
StartCurr_OC1 to value 38%
tDef_OC1 to value 2.0s (typical setting)
DirMode_OC1 to Forward
DirPrinc_OC1 to IcosPhi&U
ActLowVolt1_VM to Block
305 shows overall protection characteristic
Q [pu]
A
B
0
0.2 0.4 0.6 0.8
-rca
C
ILowSet
D
Operating Region
Operating region
ILowSet
P
1 1.2 1.4
[pu]
Multipurpose protection
I
PS
rca
U
PS
en05000535.vsd
Section 11
505