Example 3 - Hitachi Relion 670 Series Applications Manual

Section 4
Analog inputs
IEC05000460 V2 EN-US
Figure 10:
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.
IEC05000461 V2 EN-US
Figure 11:
48
Transformer
Transformer
protection
IED
Setting of current input:
Set parameter
CTStarPoint with
Transformer as
reference object.
Correct setting is
"ToObject"
Example how to set CTStarPoint parameters in the IED
Transformer
Transformer and
Line protection
Setting of current input:
Set parameter
CTStarPoint with
Transformer as
reference object.
Correct setting is
"ToObject"
Example how to set CTStarPoint parameters in the IED
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Setting of current input: Setting of current input:
Set parameter
CTStarPoint with
Transformer as
reference object.
Correct setting is
"ToObject"
IED
Setting of current input:
Set parameter
CTStarPoint with
Transformer as
reference object.
Correct setting is
"ToObject"
1MRK506375-UEN Rev. N
Line
Reverse Forward
Definition of direction
for directional functions
Line protection
IED
Set parameter
CTStarPoint with
Line as
reference object.
Correct setting is
"FromObject"
SEMOD55055-35 v8
Line
Forward Reverse
Definition of direction
for directional
line functions
Railway application RER670
Application manual