ABB RELION REB670, Руководство по применению

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IEC16000149-1.en.vsdx
IEC16000149 V1 EN-US
Figure 79: ACT configuration example for Bus-Coupler 01 in Section 1
Step 5 : ACT engineering of the Bus Section bay
The bus-section bay is used to interconnect the two section via a circuit breaker.
Similar steps to Step 4 can be done for bus section bay, except that the bus section bay
can be connected to Z1 or Z2 or Z3 on the first section and to Z4 or Z5 or Z6 on the
second section. How it is connected depends on the operational status of the six busbar
disconnectors (i.e. three on each side). 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 six
busbar 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 six 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 BDCGAPC function block to the respective
zone control input on the bus-interconnector function block BICPTRC_xx. This
will ensure proper dynamic inclusion of the CT measurements from the two CTs
located within the bus-section bay towards the differential protection zones.
4. Connect the two currents from the TRM via pre-processing blocks to the
BICPTRC_xx function block. Ensure overlapping of the two CTs. In case that
only one CT is available, connect this CT to both CT inputs on the BICPTRC_xx
function block and then invert one of the two in the software by using the
1MRK 505 370-UUS A
Section 6
Differential protection
Busbar protection REB670 2.2 ANSI 161
Application manual