ABB RELION 670 Series Applications Manual page 136

Section 6
Differential protection
Table 20: Possible solutions for a typical GIS station
Version of REB670 IED
3PH; 2-zones, 4-bays BBP (A20)
3PH; 2-zones, 8-bays BBP (A31)
1Ph; 2-zones, 12-bays BBP (B20)
1Ph; 2-zones, 12-bays BBP (B21)
1Ph; 2-zones, 24-bays BBP (B31)
)
* with just one CT input from bus-coupler bay
Please note that table
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
6.1.4.10 Double busbar-single breaker with transfer bus arrangements
This type of arrangement is shown in figure 68.
ZA
ZB
189
289
152
ANSI06000015 V1 EN-US
Figure 68: Example of double busbar-single breaker with transfer bus arrangement
This type of busbar arrangement is very common in some countries. It provides good balance
between maintenance work requirements and security of supply. If needed, two busbars can be
split during normal service. Additionally any feeder CB can be taken out for maintenance without
interruption of supply to the end customers connected to this feeder.
130
20 is given for the preconfigured versions of REB670 which do not contain
45
789
789 189 289 189 289
152 152
Number of feeders on Number of REB670 IEDs required for the
each side of the scheme
station (excluding
bus-coupler & bus-
section bays)
NA
)
5*
NA
)
9*
)
21*
789
789 2089 189 289
152
1MRK 505 337-UUS A
NA
2
NA
6
6
189 289 789
152
xx06000015_ansi.vsd
Application manual
M12356-3 v4