ABB RED615 Technical Manual page 592

Section 6
Supervision functions
586
GUID-C5A6BB27-36F9-4652-A5E4-E3D32CFEA77B V1 EN
Figure 317: Connection diagram for current circuit supervision with two sets of
three-phase current transformer cores (protection and
measurement)
Example of incorrect connection
The currents must be measured with two independent cores, that is, the phase
currents must be measured with a different core than the reference current. A
connection diagram shows an example of a case where the phase currents and the
reference currents are measured from the same core.
1YHT530004D05 D
615 series
Technical Manual