ABB REB670 Series - Typical arrangement which can be covered

6.1.5.2 Typical arrangement which can be covered
GUID-2BC52A24-7844-4F83-A11E-944FC3487582 v1
The six-zone busbar differential protection is intended for applications with complex
switchgear layout. In general, there are the following restrictions:
1. Up to six independent protection zones
2. Up to twenty-four CT inputs (depends on selected IED hardware)
3. Up to twenty-four feeder bays
4. Up to five bus interconnector (i.e. bus-ties) bays
5. For very large installation the total number of binary inputs and outputs, which can be
fitted in one IED, can also be a limiting factor. For such installations the possibility to
share the disconnector status among the three IEDs using communication (e.g. GOOSE or
LDCM) can be considered.
Five typical examples of busbar arrangements with up to six differential zones are presented
in Figure
71 - Figure 75. In the next section, the engineering procedure is described for the
example application shown in Figure
74 to illustrate the engineering principles.
Z1
Z2
Z5
Z6
QB1
Z3
Z4
QA1
B11 B11
QA1
B12
B14
B13 B11
QA1
QA1
QA1
Feeder 01-08
Bus-Interconnector 1 with two CTs
Bus-Interconnector 2
with one CT
Bus-Interconnector 3
with one CT
Feeder 09-15
QB11
QB21
QB2 QB1 QB2
QB10 QB20 QB2 QB20 QB1 QB10
QB1 QB2
IEC16000142-1.en.v sdx
Sectionalizing disconnectors
IEC16000142 V1 EN-US
Figure 71: Double busbar station with six protection zones
Z1
Z2
Z3
Z4
QB1
QA1
B11
B11
QA1
B12
B11
QA1
Feeder 01-06
Bus-Interconnector 1 with two CTs Feeder 07-18
QB11
QB21
QB2 QB1 QB2
QB10 QB20
QB1 QB2
QB9
QB7 QB7
QB9
IEC16000143-1.en.v sdx
Sectionalizing disconnectors
IEC16000143 V1 EN-US
Figure 72: Double busbar station with breaker bypass facility and four protection zones
Section 6 1MRK 505 370-UEN D
Differential protection
128 Busbar protection REB670
Application manual