ABB Relion 670 Series Applications Manual page 66

Section 4
Analog inputs
ANSI06000196 V1 EN-US
Figure 18:
For busbar protection, it is possible to set the CT_WyePoint 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 CT_WyePoint = ToObject, and for all CT inputs marked with 2 in Figure 18, set
CT_WyePoint = 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 CT_WyePoint = FromObject, and for all CT inputs marked with 2 in
Figure 18, set CT_WyePoint = 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 1000/5 A CT, the following settings shall be used:
60
Example how to set CT_WyePoint parameters in the IED
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Busbar
Busbar
Protection
1
2
1MRK 505 370-UUS Rev. K
2
1
en06000196_ansi.vsd
Busbar protection REB670
Application manual