Example On How To Connect A Star Connected Three- Phase Ct Set To The Ied - ABB 650 series Applications Manual

Section 4
Analog inputs
4.2.2.5
L1
CT 600/5
Star Connected
Protected Object
IEC13000002 V4 EN-US
Figure 10: Star connected three-phase CT set with star point towards the protected object
42
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
Example on how to connect a star connected three-phase CT set to
the IED
Figure 10 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.
L2 L3
IL1
IL2
IL3
IN
IED
1
2
3
1MRK 511 423-UEN A
SEMOD55055-352 v11
4
SMAI2
BLOCK AI3P
REVROT AI1
5
^GRP2L1 AI2
^GRP2L2 AI3
^GRP2L3 AI4
^GRP2N AIN
IEC13000002-4-en.vsdx
Bay control REC650 2.2 IEC
Application manual