ABB Relion 670 Series Applications Manual page 200

Section 7
Current protection
200MVAr
400kV
IEC09000754 V1 EN-US
Figure 90: Single line diagram for the application example
From figure
this SCB:
1000 200[
=
I
r
IEC09000755 V1 EN-US
or on the secondary CT side:
=
I
r S _ ec
IEC09000756 V1 EN-US
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
194
400kV
500/1
90 it is possible to calculate the following rated fundamental frequency current for
×
MVAr ]
=
289
×
3 400[ kV ]
289 A
=
0.578 A
500 1
Preprocessing
Function Block
SMAI
A
1MRK 511 358-UUS A
Capacitor bank
protection function
CBPGAPC
IED
IEC09000754-1-en.vsd
Application manual
(Equation 90)
(Equation 91)