ABB ret650 - 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
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IED
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IEC05000753 V2 EN-US
Figure 5: Example how to set CTStarPoint parameters in the IED
Figure 5 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 504 169-UEN A Section 4
Analog inputs
Transformer protection RET650 2.2 IEC 39
Application manual