ABB REB670 Series - Page 71

Busbar
Protection
Busbar
1
2
2
1
en06000196.vsd
IED
1
IEC06000196 V2 EN-US
Figure 18: Example how to set CTStarPoint parameters in the IED
For busbar protection, it is possible to set the CTStarPoint parameters in two ways.
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 CTStarPoint = ToObject , and for all CT inputs marked with 2 in
Figure 18, set CTStarPoint = FromObject .
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 CTStarPoint = FromObject , and for all CT inputs
marked with 2 in Figure 18, set CTStarPoint = ToObject .
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
CTsec and
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).
1MRK 505 370-UEN D Section 4
Analog inputs
Busbar protection REB670 65
Application manual