ABB RED650 Applications Manual

Transformer
protection
Transformer
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"
IED
IED
IEC05000460 V2 EN-US
Figure 5: Example how to set CTStarPoint 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 set to Forward to
look towards the line.
4.2.2.3 Example 3
SEMOD55055-35 v7
One IED used to protect two objects.
Section 4 1MRK 505 393-UEN B
Analog inputs
42 Line differential protection RED650 2.2 IEC
Application manual

ABB RED650 Specifications

General

Brand	ABB
Model	RED650
Category	Protection Device
Language	English