ABB RELION REX640 Technical Manual page 1216

Section 6
Supervision functions
1210
GUID-3377FB14-EA48-4ACE-B112-431615F56AB5 V1 EN
Figure 658: Connection diagram for reference current measurement with core-
balanced current transformer
Current measurement with two independent three-phase sets of CT
cores
Figure 659 and Figure 660
is measured with two independent three-phase sets of CT cores.
show diagrams of connections where the reference current
1MRS759142 C
REX640
Technical Manual