4.2.2.5
Example on how to connect a star connected two-phase CT set to
the IED
SEMOD55055-352 v11
gives an example about the wiring of a star connected two-phase CT set
to the IED. It gives an overview of the actions which are needed to make this
measurement available to the built-in protection and control functions within the
IED as well.
For correct terminal designations, see the connection diagrams
valid for the delivered IED.
L1
IL
1
IL
2
L2
Protected Object
CT 600/5A
Star Connected
IL1
IL2
IED
IEC16000136-1-en.vsdx
1
2
3
4
SMAI2
BLOCK
^GRP2L1
^GRP2L2
^GRP2L1L2
^GRP2N
AI2P
AI1
AI2
AI3
AI4
AIN
5
IN
IEC16000136 V1 EN-US
Figure 12:
Star connected two-phase CT set with star point towards the
protected object
Where:
1)
Shows how to connect two individual phase currents from a star connected two-phase CT
set to the two CT inputs of the IED.
2)
The current inputs are located in the TRM. It shall be noted that for all these current inputs
the following setting values shall be entered for the example shown in Figure
.
•
CTprim=600A
•
CTsec=5A
•
CTStarPoint=ToObject
Ratio of the first two parameters is only used inside the IED. The third parameter
(CTStarPoint=ToObject) as set in this example causes no change on the measured
currents. In other words, currents are already measured towards the protected object.
Table continues on next page
Section 4
1MRK 506 375-UEN A
Analog inputs
50
Railway application RER670 2.2 IEC
Application manual
Summary of Contents for RELION RER670
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