ABB REB670 Applications Manual page 160

Section 6
Differential protection
154
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
not contain any VT inputs.
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
1MRK 505 370-UUS A
Number of REB670 IEDs
required for the scheme
NA
1
NA
3
3
Busbar protection REB670 2.2 ANSI
Application manual