ABB RET670 Applications Manual page 505

1MRK504116-UUS C
Application manual
289 A
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IEC09000756 V1 EN
Note that the SCB rated current on the secondary CT side is important for secondary
injection of the function.
The parameters for the Capacitor bank protection function CBPGAPC are set via the
local HMI or PCM600. The following settings are done for this function:
General Settings:
Operation =Enabled; to enable the function
IBase =289A; Fundamental frequency SCB rated current in primary amperes. This
value is used as a base value for pickup settings of all other features integrated in this
function.
Reconnection inhibit feature:
OperationRecIn =Enabled; to enable this feature
IRecInhibit =10% (of IBase); Current level under which function will detect that SCB
is disconnected from the power system
tReconnInhibit =300s; Time period under which SCB shall discharge remaining
residual voltage to less than 5%.
Overcurrent feature:
OperationOC =Enabled; to enable this feature
PU 51 =135% (of IBase); Current level for overcurrent pickup. Selected value gives
pickup recommended by international standards.
tOC =30s; Time delay for overcurrent trip
Undercurrent feature:
Operation37 =Enabled; to enable this feature
PU_37 =70% (of IBase); Current level for undercurrent pickup
tUC =5s; Time delay for undercurrent trip
A
Section 3
IED application
(Equation 397)
499