ABB REB670 Series - Example 2

Transformer
protection
Transformer
Line
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"
IEC05000753=IEC05
000753=1=en=Origin
al[1].vsd
I
s
I
s
I
p
I
p
I
p
IED
IED
IEC05000753 V2 EN-US
Figure 14: Example how to set CTStarPoint parameters in the IED
Figure 14 shows the normal case where the objects have their own CTs. The settings for CT
direction shall be done according to the figure. To protect the line, direction of the directional
functions of the line protection shall be set to
Forward . This means that the protection is
looking towards the line.
4.2.2.2 Example 2
SEMOD55055-29 v7
Two IEDs used for protection of two objects and sharing a CT.
1MRK 505 370-UEN D Section 4
Analog inputs
Busbar protection REB670 61
Application manual