With REB670 this type of arrangement can be protected as described in the following
table.
Table 21: Possible solutions for a typical GIS station
Version of REB670 IED Number of feeders on
each side of the station
(excluding bus-coupler &
bus-section bays)
Number of REB670 IEDs
required for the scheme
3PH; 2-zones, 4-bays BBP (A20) NA NA
3PH; 2-zones, 8-bays BBP (A31)
5*
)
2
1Ph; 2-zones, 12-bays BBP (B20) NA NA
1Ph; 2-zones, 12-bays BBP (B21)
9*
)
6
1Ph; 2-zones, 24-bays BBP (B31)
21*
)
6
*
)
with just one CT input from bus-coupler bay
Please note that Table 21 is given for the preconfigured versions of REB670 which do
not contain any VT inputs.
Provision for zone selection, disconnector replica and zone interconnection have to be
included into the scheme design.
For station with just one CT in the bus-coupler or bus-section bays, it might be
required, depending on the client requirements, to provide the special scheme for
disconnection of bus-coupler or bus-section CT when the bus-coupler or bus-section
CB is open. For more info please refer to Figure 48
6.1.4.10 Combined busbar arrangements
M6650-3 v5
There are stations which are practically a combination between two normal types of
station arrangements, which are already previously described. Some typical examples
will be shown here:
Section 6 1MRK 505 370-UUS A
Differential protection
152 Busbar protection REB670 2.2 ANSI
Application manual
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