ABB RED650 Applications Manual

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
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.
L1
IL1
IL2 IL3
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
AIN
5
IN
IEC13000002 V4 EN-US
Figure 10: Star connected three-phase CT set with star point towards the protected object
Section 4 1MRK 505 393-UEN B
Analog inputs
46 Line differential protection RED650 2.2 IEC
Application manual

ABB RED650 Specifications

General

Brand	ABB
Model	RED650
Category	Protection Device
Language	English