BI1 BI1 BI1 BI1
QA1 QA1 QA1 QA1
ZA
xx06000087.vsd
IEC06000087 V1 EN-US
Figure 53: Example of single busbar section with six feeder bays
This type of busbar arrangement can be very easily protected. The most common setups for
this type of station are described in the following table.
Table 14: Typical solutions for single busbar arrangement
Version of REB670 IED Numbers of feeders
per busbar
Number of REB670 IEDs required for
the scheme
3PH; 2-zones, 4-bays BBP (A20) 4 1
3PH; 2-zones, 8-bays BBP (A31) 8 1
1Ph; 2-zones, 12-bays BBP (B20) 12 3
1Ph; 2-zones, 12-bays BBP (B21) 12 3
1Ph; 2-zones, 24-bays BBP (B31) 24 3
Please note that the above Table 14 is given for the preconfigured versions of REB670 which do
not contain any VT inputs.
6.1.4.3 Single busbar arrangements with sectionalizer
M6642-3 v5
This arrangement is very similar to the single busbar arrangement. The sectionalizer allows the
operator to split the station into two separate buses. However, switching of the sectionalizing
disconnector has to be done without any load. This means that one of the two busbars has to
be de-energized before any opening or closing of the sectionalizer.
For this case the protection scheme must have two differential zones, which can be either split
to work independently from each other or switched to one overall differential zone when
sectionalizing disconnector is closed. Nevertheless, when sectionalizer is closed, for internal
fault on any of the two buses all feeder circuit breakers have to be tripped, which causes loss
of supply to all loads connected to this station.
BI1
BI1 BI1 BI1 BI1 BI1 BI1
QA1 QA1 QA1 QA1 QA1 QA1 QA1
QB1
ZA ZB
IEC11000238-1-en.vsd
IEC11000238 V1 EN-US
Figure 54: Example of two single busbar sections with bus-sectionalizing disconnector
and eight feeder bays per each busbar section
The most common setups for this type of station are described in the following table.
1MRK 505 370-UEN D Section 6
Differential protection
Busbar protection REB670 113
Application manual
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