ABB Relion 670 Series Applications Manual page 136

Section 6
Differential protection
6.1.5 Six-zone busbar arrangements
6.1.5.1 General
Busbar differential protection application for some complex busbar arrangements with up to six
differential zones are shown and described in the following sections.
6.1.5.2 Typical arrangement which can be covered
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
- Figure 76. In the next section, the engineering procedure is described for the example application
shown in Figure
Z1
Z2
QB1 QB2
QA1
B11
Feeder 01-08
IEC16000142 V1 EN-US
Figure 72:
Z1
Z2
QB1
QA1
QB9
Feeder 01-06
IEC16000143 V1 EN-US
Figure 73:
130
75 to illustrate the engineering principles.
Sectionalizing disconnectors
QB11
QB21
QB1 QB2 QB10
B11
QA1
Bus-Interconnector 1 with two CTs
Double busbar station with six protection zones
Sectionalizing disconnectors
QB2 QB1 QB2
QB7
B11
B11
Bus-Interconnector 1 with two CTs
Double busbar station with breaker bypass facility and four protection zones
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Z3
Z4
QB20 QB2 QB20 QB1
QA1 QA1
B12 B14 B13
Bus-Interconnector 2 Bus-Interconnector 3
with one CT
QB11
QB21
QB10 QB20
B12
QA1
1MRK 505 370-UUS Rev. K
GUID-28529398-F8D1-419B-9FB6-700BF19A2989 v1
GUID-2BC52A24-7844-4F83-A11E-944FC3487582 v1
Z5
Z6
QB10 QB1 QB2
QA1
B11
Feeder 09-15
with one CT
IEC16000142-1.en.vsdx
Z3
Z4
QB1 QB2
QA1
QB7
QB9
B11
Feeder 07-18
IEC16000143-1.en.vsdx
Busbar protection REB670
72
Application manual