Example On How To Connect A Star Connected Three-Phase Ct Set To The Ied - ABB REG670 Applications Manual

1MRK 502 071-UEN -
4.2.2.5
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
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
Example on how to connect a star connected three-phase CT set to the
IED
Figure 18 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.
Section 4
Analog inputs
71