ABB RELION REX640 Technical Manual page 1316

Protection and control

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Supervision functions

Figure 749: 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.

1MRS759142 F

Technical Manual