Single Busbar Arrangements With Sectionalizer - ABB REB670 Applications Manual

Section 6
Differential protection
6.1.4.3
130
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 13: Typical solutions for single busbar arrangement
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)
Please note that the above table
which do not contain any VT inputs.

Single busbar arrangements with sectionalizer

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.
Numbers of feeders per
busbar
4
8
12
12
24
13 is given for the preconfigured versions of REB670
1MRK 505 337-UUS -
Number of REB670 IEDs
required for the scheme
1
1
3
3
3
Application manual