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Transformer and
Line protection
Transformer
Line
Setting of current input
for transformer functions:
Set parameter
CTStarPoint with
Transformer as
reference object.
Correct setting is
"ToObject"
Forward
Reverse
Definition of direction
for directional
line functions
Setting of current input
for transformer functions:
Set parameter
CTStarPoint with
Transformer as
reference object.
Correct setting is
"ToObject"
Setting of current input
for line functions:
Set parameter
CTStarPoint with
Line as
reference object.
Correct setting is
"FromObject"
IED
IEC05000462 V2 EN-US
Figure 7:
Example how to set CTStarPoint parameters in the IED
Figure 8:
For busbar protection, it is possible to set the
CTStarPoint
parameters in two ways.
The first solution will be to use busbar as a reference object. In that case for all CT
inputs marked with 1 in Figure
, set
CTStarPoint
=
ToObject
, and for all CT
inputs marked with 2 in Figure
, set
CTStarPoint
=
FromObject
.
The second solution will be to use all connected bays as reference objects. In that
case for all CT inputs marked with 1 in Figure
, set
CTStarPoint
=
FromObject
,
and for all CT inputs marked with 2 in Figure
CTStarPoint
=
ToObject
.
Regardless which one of the above two options is selected, busbar differential
protection will behave correctly.
The main CT ratios must also be set. This is done by setting the two parameters
CTsec
and
CTprim
for each current channel. For a 1000/1 A CT, the following
settings shall be used:
•
CTprim
=
1000
(value in A)
•
CTsec
=
1
(value in A).
Section 4
1MRK 511 423-UEN A
Analog inputs
40
Bay control REC650 2.2 IEC
Application manual
Содержание 650 series
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