ABB Relion REC670 Applications Manual page 63

1MRK 511 358-UEN A
IEC06000196 V2 EN-US
Figure 11: 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 11, set
figure 11, 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 11, set
marked with 2 in figure 11, 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 setting shall be used:
CTprim = 1000 (value in A)
•
CTsec = 1 (value in A).
•
Application manual
CTStarPoint = ToObject , and for all CT inputs marked with 2 in
CTStarPoint = FromObject .
CTStarPoint = ToObject .
Busbar
Protection
1
2
CTStarPoint parameters in two ways.
CTStarPoint = FromObject , and for all CT inputs
Analog inputs
Busbar
IED
en06000196.vsd
CTsec and
Section 4
2
1 1
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