ABB RED615 Technical Manual page 590

Section 6
Supervision functions
584
Reference current measured with core-balanced current transformer
CCRDIF compares the sum of phase currents to the current measured with the core-
balanced CT.
GUID-88FC46C8-8D14-45DE-9E36-E517EA3886AA V1 EN
Figure 315: Connection diagram for reference current measurement with core-
balanced current transformer
Current measurement with two independent three-phase sets of CT
cores
Figure 316 and Figure 317
current is measured with two independent three-phase sets of CT cores.
show diagrams of connections where the reference
1YHT530004D05 D
615 series
Technical Manual