ABB REB670 Applications Manual page 233

1MRK 505 337-UUS -
Application manual
×
1000 200[ MVAr
=
I
r ×
3 400[ kV ]
IEC09000755 V1 EN
or on the secondary CT side:
289 A
= =
I 0.578
r S _ ec 500 1
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
]
=
289 A
A
Section 7
Current protection
(Equation 70)
(Equation 71)
227