ABB Relion 670 Series Applications Manual page 141

1MRK 505 370-UUS Rev. K
IEC16000150 V2 EN-US
Figure 80:
Step 6: ACT engineering of the Bus Sectionalizing Disconnectors
Three bus-sectionalizing disconnectors are installed in this station. Each disconnector is used to
interconnect the two zones located at the two sections. Ultimately when this type of disconnector is
closed, the two relevant zones shall be merged (i.e. switched into one common zone) in the IED
software. In this particular station, the zones can be possibly linked in the following way: Z1&Z4, Z2&Z5
and Z3&Z6. When any linking shall occur, it depends on the operational status of the three bus-
sectionalizing disconnectors. More specifically, the following steps need to be done:
1. Connect the two auxiliary contacts (i.e. normally open and normally closed auxiliary contacts or also
sometimes called "a & b contacts") from each of the three sectionalizing disconnectors to the IED.
This can be done by wiring using binary inputs or via communication (e.g. via GOOSE or via
LDCM).
2. Use three BDCGAPC function blocks (i.e. one per busbar disconnector) to derive open or closed
status of the respective disconnector primary contacts.
3. Connect the close status output from each BDCGAPC function block to the respective zones
merging input on the common BBP function block BDZSGAPC. This will ensure proper dynamic
linking of the affected differential zones.
ACT configuration example for three bus-sectionalizing disconnectors presenting in this station is given in
Figure 81.
Busbar protection REB670
Application manual
ACT configuration example for Bus-Section bay
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Section 6
Differential protection
IEC16000150-2-en-us.vsdx
135