ABB Relion 670 Series Applications Manual page 68

Section 4
Analog inputs
4.2.2.5 Example on how to connect a wye connected three-phase CT set to the IED
Figure 20
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
Star Connected
Protected Object
ANSI13000002 V4 EN-US
Figure 20: Wye connected three-phase CT set with wye point towards the protected object
62
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 gives an
For correct terminal designations, see the connection diagrams valid for the delivered
IED.
B C
I_A
I_B
I_C
I_N
© 2017 - 2021 Hitachi Power Grids. All rights reserved
IED
1
2
3
1MRK 505 370-UUS Rev. K
4
SMAI2
BLOCK AI3P
REVROT AI1
5
^GRP2_A AI2
^GRP2_B AI3
^GRP2_C AI4
^GRP2_N AIN
ANSI13000002-4-en.vsdx
Busbar protection REB670
Application manual
SEMOD55055-352 v12