189ZA ZBANSI11000238-1-en.vsd152 152 152 152 152 152152ANSI11000238 V1 ENFigure 54: Example of two single busbar sections with bus-sectionalizingdisconnector and eight feeder bays per each busbar sectionThe most common setups for this type of station are described in the following table.Table 14:Typical solutions for stations with two single busbar sections with bus-sectionalizingdisconnectorVersion of REB670 IED Total Number of feedersin both busbar sectionsNumber of REB670 IEDsrequired for the scheme3PH; 2-zones, 4-bays BBP (A20) 4 13PH; 2-zones, 8-bays BBP (A31) 8 11Ph; 2-zones, 12-bays BBP (B20) 12 31Ph; 2-zones, 12-bays BBP (B21) 12 31Ph; 2-zones, 24-bays BBP (B31) 24 3Please note that table 14 is given for the preconfigured versions of REB670 which do notcontain any VT inputs.Two differential zones are available in the IED and the connecting of the two zones issimply controlled via zone interconnection logic, as described in section "Zoneinterconnection (Load transfer)". In practice, the closed position of the sectionalizer shallstart the zone interconnection logic inside the IED. All other thinks (that is, tripping) willautomatically be arranged.6.1.4.4 Single busbar arrangements with bus-section breakerThis arrangement is very similar to the single busbar arrangement. The bus-sectionbreaker allows the operator to split the station into two separate buses under full load. Therequirement for busbar protection scheme is that the scheme must have two independent1MRK 505 337-UUS - Section 6Differential protection131Application manual
