It is recommended to:
•
use 1A rated CT input into the IED in order to connect CTs
with 1A and 2A secondary rating
•
use 5A rated CT input into the IED in order to connect CTs
with 5A and 10A secondary rating
4.2.2.5
Example on how to connect a star connected three-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
IL
3
L2
L3
Protected Object
CT 600/5
Star Connected
IL1
IL2
IL3
IED
IEC13000002-4-en.vsdx
1
2
3
4
SMAI2
BLOCK
REVROT
^GRP2L1
^GRP2L2
^GRP2L3
^GRP2N
AI3P
AI1
AI2
AI3
AI4
AI N
5
IN
IEC13000002 V4 EN-US
Figure 10:
Star connected three-phase CT set with star point towards the protected object
Section 4
1MRK 511 423-UEN A
Analog inputs
42
Bay control REC650 2.2 IEC
Application manual
