Example 2; Example 3 - ABB Relion 670 Series Applications Manual

1MRK 511 358-UUS A
I
p
I
s
Setting of current input:
Set parameter
CT_WyePoint with
Transformer as
reference object.
Correct setting is
"ToObject"
ANSI05000753 V2 EN-US
Figure 19: Example how to set CT_WyePoint parameters in the IED
The figure
direction shall be done according to the figure. To protect the line the direction of the directional
functions of the line protection shall be set to
towards the line.
4.2.2.2

Example 2

Two IEDs used for protection of two objects and sharing a CT.
Figure 20: Example how to set CT_WyePoint 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
Forward to look towards the line.
set to
4.2.2.3

Example 3

One IED used to protect two objects.
Application manual
Transformer
I
p
Transformer
protection
IED
Setting of current input:
Set parameter
CT_WyePoint with
Transformer as
reference object.
Correct setting is
"ToObject"
19 shows the normal case where the objects have their own CTs. The settings for CT
Line
I
p
for directional functions
I
s
Setting of current input:
Set parameter
CT_WyePoint with
Line as
reference object.
Correct setting is
"FromObject"
Forward . This means that the protection is looking
Line
Reverse Forward
Definition of direction
Line protection
IED
ANSI05000753.vsd
Section 4
Analog inputs
SEMOD55055-29 v5
SEMOD55055-35 v5
69