ABB 615 series Technical Manual page 857

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1MAC059074-MB A

615 series ANSI

Technical Manual

lower than with the protection core. This should be taken into account

when setting the current circuit supervision function.

GUID-C5A6BB27-36F9-4652-A5E4-E3D32CFEA77B-ANSI V3 EN

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.

Supervision functions

protection relay

Measurement device

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