ABB Relion 670 Series Applications Manual page 70

Section 4
Analog inputs
4.2.2.5 Example on how to connect a wye connected three-phase CT set to the IED
Figure 13
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.
A
CT 600/5
Wye Connected
Protected Object
ANSI13000002 V3 EN-US
Figure 13: Wye connected three-phase CT set with wye point towards the protected object
64
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
gives an example about the wiring of a wye connected two-phase CT set to the IED. It
For correct terminal designations, see the connection diagrams valid for the
delivered IED.
B C
I_A
I_B
I_C
© Copyright 2017 ABB. All rights reserved
IED
1
2
3
1MRK 511 401-UUS F
SEMOD55055-352 v11
4
SMAI_20
ANSI13000002-3-en.vsd
Bay control REC670
Application manual