Example On How To Connect A Wye Connected Three-Phase Ct Set To The Ied - ABB REB670 Applications Manual

Section 4
Analog inputs
4.2.2.5
68
It shall be noted that depending on national standard and utility practices, the rated
secondary current of a CT has typically one of the following values:
• 1A
• 5A
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 wye connected three-phase CT set to the
IED
Figure 21 gives an example about the wiring of a wye connected three-phase CT set to the
IED. It gives also 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.
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Application manual