ABB Relion REC670 - Example 3

Transformer
protection
Transformer
Line
Setting of current input:
Set parameter
CTStarPoint with
Transformer as
reference object.
Correct setting is
"ToObject"
ForwardReverse
Definition of direction
for directional functions
Line protection
Setting of current input:
Set parameter
CTStarPoint with
Transformer as
reference object.
Correct setting is
"ToObject"
Setting of current input:
Set parameter
CTStarPoint with
Line as
reference object.
Correct setting is
"FromObject"
IED
IED
IEC05000460 V2 EN-US
Figure 8: Example how to set CTStarPoint parameters in the IED
This example is similar to example 1, but here the transformer is feeding just one line and the
line protection uses the same CT as the transformer protection does. The CT direction is set
with different reference objects for the two IEDs though it is the same current from the same
CT that is feeding the two IEDs. With these settings the directional functions of the line
protection shall be set to
Forward to look towards the line.
4.2.2.3 Example 3
SEMOD55055-35 v5
One IED used to protect two objects.
Section 4 1MRK 511 358-UEN A
Analog inputs
54
Application manual