ABB REC650 - Example 2

Transformer
protection
Transformer
Line
Line
Setting of current input:
Set parameter
CT_WyePoint with
Transformer as
reference object.
Correct setting is
"ToObject"
ForwardReverse
Definition of direction for
directional functions
Line protection
Setting of current input:
Set parameter
CT_WyePoint with
Transformer as
reference object.
Correct setting is
"ToObject"
Setting of current input:
Set parameter
CT_WyePoint with
Line as
reference object.
Correct setting is
"ToObject"
ANSI11000020-2-en.vsd
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ANSI11000020 V2 EN
Figure 16: Example how to set CT_WyePoint parameters in the IED
The figure 16 shows the most common case where the objects have their own CTs. For the
transformer protection, the protected object is the transformer. Therefore both
CT_WyePoint directions should be set ToObject. For the line protection, the protected
object is the line. The line CT is grounded towards the busbar, therefore the CT_WyePoint
should be set FromObject.
4.2.3.2 Example 2
Two IEDs used for protection of two objects and sharing a CT.
Section 4 1MRK 511 286-UUS A
Analog inputs
64
Application manual