ABB REB670 Applications Manual page 164

Section 6
Differential protection
158
In the single line diagram the individual bus-protection zones in the station shall be
indicated and associated with the corresponding zones available within the IED. This
has been already done for all five example applications, see the marked zones Z1, Z2
etc. in the figures above.
Step 2: ACT engineering of the feeder bays at Section 1
The feeders located at the first section, namely Section 1, can be connected to either Z1
or Z2 or Z3, depending on the operational status of the three busbar disconnectors, in
this particular station. More specifically, the following steps need to be done, for each
feeder 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
three 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 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 zone control input on the feeder bay function block BFPTRC_Fxx. This
will ensure proper dynamic inclusion of the feeder CT measurement towards the
differential protection zones.
4. Connect the feeder current from the TRM via pre-processing block to the bay
function block BFPTRC_Fxx.
5. Connect the trip output from BFPTRC_Fxx function block to the binary output
contact (alternatively the tripping can also be arranged using GOOSE
communication). This will ensure proper tripping of this feeder bay for any
relevant operation of the BBP including BFP tripping.
ACT configuration example for Feeder 01 located at Section 1 is given in Figure 77.
Any other feeders located at Section 1 shall be engineered in the similar way.
1MRK 505 370-UUS A
Busbar protection REB670 2.2 ANSI
Application manual