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Section 6
Differential protection
IEC16000149 V1 EN-US
Figure 78: 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 parameter setting
taking into account the actual location of the CT star point in this bay.
5.
Connect the trip output from the BICPTRC_xx function block to the binary output contact
(alternatively tripping can also be arranged using GOOSE communication). This will ensure
proper tripping of the bus-section bay for any relevant operation of the BBP including BFP
tripping.
ACT configuration example for Bus-section bay is given in Figure 79.
132
1MRK 505 370-UEN D
IEC16000149-1.en.vsdx
OperMode . This shall be done
Busbar protection REB670
Application manual
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