ABB Relion 670 Series Applications Manual page 123

1MRK 505 370-UUS Rev. K
01
52
ZA
52
03
ANSI06000121 V1 EN-US
Figure 57:
The requirement for the busbar protection scheme for this type of station may differ from utility to utility. It
is possible to apply just one overall differential zone, which protects both busbar sections. However, at an
internal fault on any of the two buses all feeder circuit breakers have to be tripped, which will cause loss
of supply to all loads connected to this station. Some utilities prefer to have two differential zones, one for
each bus section.
The most common setups for this type of station are given in the following table.
Table 17:
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 Table
inputs.
Busbar protection REB670
Application manual
52
Example of H-type station
Typical solutions for H-type stations
17 is given for the preconfigured versions of REB670 which do not contain any VT
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02
52
ZB
52
04
xx06000121_ansi.vsd
Number of differential
zones/number of
feeders per zone
1/4
2/3
NA
NA
NA
Differential protection
Number of REB670 IEDs required for the
scheme
1
1
NA
NA
NA
Section 6
117