ABB REG670 Applications Manual page 75

1MRK 502 071-UEN -
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
IEC06000196 V2 EN
Figure 16: 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 16, set CTStarPoint = ToObject, and for all CT inputs
marked with 2 in Figure 16, 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 16, set CTStarPoint = FromObject, and for
all CT inputs marked with 2 in Figure 16, 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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