ABB REF615 Applications Manual page 204

Section 7
Supervision functions
198
GUID-C5A6BB27-36F9-4652-A5E4-E3D32CFEA77B V1 EN
Figure 100: 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.
1MRS756378 D
REF615
Application Manual