ABB REG670 - 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
Figure 13: 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
One IED used to protect two objects.
Section 4 1MRK 502 071-UEN -
Analog inputs
66 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual