ABB Relion RES670, Applications Manual

Page: 61 / 382

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 12 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 511 407-UEN C
Section 4
Analog inputs
Phasor measurement unit RES670 2.2 IEC 55
Application manual