ABB REB670 Applications Manual page 154

Section 6
Differential protection
148
152 252 152
ANSI06000124 V1 EN
Figure 70: Combination between double breaker and double busbar station layouts
In this type of arrangement the double breaker bay has in the same time the role of the bus-
coupler bay for normal double busbar single breaker stations. Therefore, zone
interconnection, zone selection and disconnector replica facilities have to be provided for
all double busbar bays. Because of the very specific requirements on zone interconnection
feature, the following should be considered for this type of application:
• current inputs CT1 and CT2 shall be used for the first double breaker bay.
• current inputs CT3 and CT4 shall be used for the second double breaker bay.
• current inputs CT5 and CT6 shall be used for the third double breaker bay (only
available in 1ph version).
Accordingly the following solutions are possible:
Table 22: Typical solutions for combination between double breaker and double busbar station
layouts
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 22
contain any VT inputs.
189 289 189
252
152
Number of double
breaker feeders / Number
of double busbar feeders
in the station
NA
2/4
NA
3/6
3/18
is given for the preconfigured versions of REB670 which do not
1MRK 505 337-UUS -
ZA
ZB
289
152
xx06000124_ansi.vsd
Number of REB670 IEDs
required for the scheme
NA
1
NA
3
3
Application manual