Current measurement with two independent three-phase sets of CT cores
Figure 438 and Figure 439 show diagrams of connections where the reference current is
measured with two independent three-phase sets of CT cores.
CCM
I_A
I_B
ALARM
FAIL
I_C
I_REF
BLOCK
protection relay
Core 1
(protection)
IL1
IL2
IL3
I_A
I_B
I_C
I_REF
Other protection devices
Core 2
(protection)
GUID-8DC3B17A-13FE-4E38-85C6-A228BC03206B-ANSI V3 EN
Figure 438: Connection diagram for current circuit supervision with two sets of three-
phase current transformer protection cores
When using the measurement core for reference current measurement, it
should be noted that the saturation level of the measurement core is much
Section 6 1MAC059074-MB A
Supervision functions
850 615 series ANSI
Technical Manual
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