ABB REL670 2.2 IEC, Applications Manual

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However, in some cases, the following rated secondary currents are used as well:
• 2A
• 10A
The IED fully supports all of these rated secondary values.
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 13 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.
1MRK 506 369-UEN B
Section 4
Analog inputs
Line distance protection REL670 2.2 IEC 73
Application manual