Example 3 - ABB REL670 2.2 IEC Applications Manual

Section 4
Analog inputs
4.2.2.3
68
Transformer
Transformer
protection
IED
Setting of current input:
Set parameter
CTStarPoint with
Transformer as
reference object.
Correct setting is
"ToObject"
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.

Example 3

One IED used to protect two objects.
Setting of current input: Setting of current input:
Set parameter
CTStarPoint with
Transformer as
reference object.
Correct setting is
"ToObject"
Line distance protection REL670 2.2 IEC
1MRK 506 369-UEN B
Line
Reverse Forward
Definition of direction
for directional functions
Line protection
IED
Set parameter
CTStarPoint with
Line as
reference object.
Correct setting is
"FromObject"
SEMOD55055-35 v7
Application manual