ABB REG670 Applications Manual

4.2.2.1 Example 1
Two IEDs used for protection of two objects.
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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s
I
s
I
p
I
p
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p
IED
IED
IEC05000753 V2 EN
Figure 12: Example how to set CTStarPoint parameters in the IED
Figure 12 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
Two IEDs used for protection of two objects and sharing a CT.
1MRK 502 071-UEN - Section 4
Analog inputs
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 65
Application manual

ABB REG670 Specifications

General

Brand	ABB
Model	REG670
Category	Protection Device
Language	English