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1MRK 505 370-UEN D
IEC16000148 V1 EN-US
Figure 77:
Step 4: ACT engineering of the Bus Coupler bays at Section 1
The bus-coupler bay is used to interconnect the differential zones via a circuit breaker within
one section. In this particular station, the Bus-Coupler 01 is located at Section 1 and
consequently it can be connected to either Z1 or Z2 or Z3. How it is connected depends on the
status of the six busbar disconnectors (i.e. three on each side). More specifically, the following
need to be done, for each bus coupler bay:
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 each 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 bus-
interconnector function block BICPTRC_xx. 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 inputs in software by using the parameter setting
OperMode . This shall be done taking into account the actual location of the CT star point
in this bay.
5.
Connect the trip output from BICPTRC_xx function block to the binary output contact
(alternatively the tripping can also be arranged using GOOSE communication). This will
ensure proper tripping of the bus-coupler bay for any relevant operation of the BBP
including BFP tripping.
ACT configuration example for Bus-coupler 01 located at Section 1 is given in Figure 78. Any
other bus coupler bays located at Section 1 shall be engineered in the similar way. For the bus
coupler bays located at Section 2, similar steps to Step 3 shall be done, except the relevant
zones are then Z4, Z5 and Z6.
Busbar protection REB670
Application manual
ACT configuration example for Feeder 17 in Section 2
Section 6
Differential protection
IEC16000148-1.en.vsdx
131
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