![background image](http://html.mh-extra.com/html/abb/relion-615-series/relion-615-series_technical-manual_2395857.webp)
lower than with the protection core. This should be taken into account
when setting the current circuit supervision function.
CCM
I_A
I_B
ALARM
FAIL
I_C
I_REF
BLOCK
protection relay
Co
re
1
(p
ro
tection
)
IL1
IL2
IL3
I_A
I_B
I_C
I_REF
Measurement device
Co
re 2
(m
ea
su
re
me
nt)
GUID-C5A6BB27-36F9-4652-A5E4-E3D32CFEA77B-ANSI V3 EN
Figure 439:
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.
1MAC059074-MB A
Section 6
Supervision functions
615 series ANSI
851
Technical Manual
Содержание Relion 615 series
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