ABB REC670 Applications Manual page 71

1MRK 511 401-UEN A
Bay control REC670 2.2 IEC
Application manual
IEC06000196 V2 EN-US
Figure 11: 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 11, set CTStarPoint = ToObject, and for all CT
inputs marked with 2 in Figure 11, 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 11, set CTStarPoint = FromObject,
and for all CT inputs marked with 2 in Figure 11, set CTStarPoint = ToObject.
Regardless which one of the above two options is selected, busbar differential
protection will behave correctly.
Busbar
Busbar
Protection
1
IED
2
Section 4
Analog inputs
2
1 1
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