ABB Relion 670 Series Applications Manual page 258

Section 11
Multipurpose protection
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
-0.2
-0.4
-0.6
-0.8
ANSI05000535 V1 EN-US
Figure 105: Loss of excitation
11.1.3.7 Undercurrent protection for capacitor bank
Following example explains how an undercurrent protection within CVGAPC function can be used
for the disconnection of shunt capacitor bank (SCB) in case of very low voltages at the busbar.
This functionality can be achieved by using one CVGAPC function and following shall be done to
ensure proper operation of the function:
1. Connect three-phase terminal currents to CVGAPC function and no need of voltage input, that
is, connect GRP_OFF from FXDSIGN to U3P of CVGAPC.
2. Set
3. Set
4. Set
5. Set
6. Set
7. Set
8. Set
9. Set
252
DirMode_OC1 to Forward
DirPrinc_OC1 to IcosPhi&V
ActLowVolt1_VM to Block
105 shows overall protection characteristic
Q [pu]
A
B
1
0.2 0.4 0.6 0.8
-rca
C
ILowSet
D
Operating Region
operation = On , select CurrentInput = MaxPh and set VoltageInput to default value
Operation_UC1 = On
EnBlkLowl_UC1 = On
BlkLowCurr_UC1 = 10.0 %IB
StartCurr_UC1 = 70.0 %IB
tDef_UC1 = 5.00 s
tResetDef_UC1 = 0.0 s
HarmRestr_UC1 = Off
© Copyright 2017 ABB. All rights reserved
Operating region
ILowSet
P [pu]
1.2
1.4
1MRK 511 401-UUS F
I
PS
rca
V
PS
en05000535_ansi.vsd
GUID-1AAD3844-6FEE-4050-8260-27E7A30F6352 v1
Bay control REC670
Application manual