ABB REB670 Series Applications Manual page 71

1MRK 505 370-UEN D
IEC06000196 V2 EN-US
Figure 18: Example how to set CTStarPoint parameters in the IED
For busbar protection, it is possible to set the
The first solution will be to use busbar as a reference object. In that case for all CT inputs
marked with 1 in Figure 18, set
Figure 18, set
The second solution will be to use all connected bays as reference objects. In that case for all
CT inputs marked with 1 in Figure 18, set
marked with 2 in Figure 18, set
Regardless which one of the above two options is selected, busbar differential protection will
behave correctly.
The main CT ratios must also be set. This is done by setting the two parameters
CTprim for each current channel. For a 1000/1 A CT, the following settings shall be used:
CTprim = 1000 (value in A)
•
CTsec = 1 (value in A).
•
Busbar protection REB670
Application manual
CTStarPoint = ToObject , and for all CT inputs marked with 2 in
CTStarPoint = FromObject .
CTStarPoint = ToObject .
Busbar
Busbar
Protection
1
IED
2
CTStarPoint parameters in two ways.
CTStarPoint = FromObject , and for all CT inputs
Section 4
Analog inputs
2
1 1
en06000196.vsd
CTsec and
65