Example On How To Connect A Wye Connected Three-Phase Ct Set To The Ied - ABB Relion 670 Series Applications Manual

Section 4
Analog inputs
4.2.2.5

Example on how to connect a wye connected three-phase CT set to the IED

Figure 25
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.
A B
CT 600/5
Star Connected
Protected Object
ANSI13000002 V2 EN-US
Figure 25: Wye connected three-phase CT set with wye point towards the protected object
74
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 three-phase CT set to the IED. It
For correct terminal designations, see the connection diagrams valid for the
delivered IED.
C
I_A
I_B
I_C
IED
1
2
3
1MRK 511 358-UUS A
SEMOD55055-352 v9
4
SMAI_20
ANSI3000002-2-en.vsd
Application manual