ABB REB670 Series Applications Manual page 120

Section 6
Differential protection
Table 15:
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
contain any VT inputs.
Two differential zones are available in the IED and the connecting of the two zones is simply
controlled via zone interconnection logic, as described in Section
transfer)". In practice, the closed position of the sectionalizer shall start the zone
interconnection logic inside the IED. All other thinks (that is, tripping) will automatically be
arranged.
6.1.4.4 Single busbar arrangements with bus-section breaker
This arrangement is very similar to the single busbar arrangement. The bus-section breaker
allows the operator to split the station into two separate buses under full load. The
requirement for busbar protection scheme is that the scheme must have two independent
differential zones, one for each busbar section. If there is an internal fault on one of the two
sections, bus-section circuit breaker and all feeder circuit breakers associated with this
section have to be tripped, leaving the other busbar section in normal operation.
QA1 QA1
BI1 BI1
IEC06000088 V1 EN-US
Figure 55: Example of two single busbar sections with bus-section circuit breaker and
This type of busbar arrangement can be quite easily protected. The most common setups for
this type of station are described in the following table.
Table 16:
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)
Table continues on next page
114
Typical solutions for stations with two single busbar sections with bus-sectionalizing disconnector
15 is given for the preconfigured versions of REB670 which do not
ZA
QA1
BI1
QA1 QA1
BI1 BI1
eight feeder bays per each busbar section
Typical solutions for single busbar arrangements with bus-section breaker
Total Number of
feeders in both busbar
sections
4
8
12
12
24
ZB
QA1 QA1
BI1 BI1
xx06000088.vsd
Total number of
feeders in both busbar
sections
)
3* /6
)
7* /14
)
11* /22
1MRK 505 370-UEN D
Number of REB670 IEDs required for
the scheme
1
1
3
3
3
"Zone interconnection (Load
Number of REB670 IEDs
required for the scheme
1/2
1/2
3/6
Busbar protection REB670
Application manual
M6643-3 v5