ABB RELION REX640 Technical Manual page 1315

1MRS759142 F
Figure 748: Connection diagram for current circuit supervision with two sets of
three-phase current transformer protection cores
REX640
Technical Manual
When using the measurement core for reference current measurement,
it should be noted that the saturation level of the measurement core
is much lower than with the protection core. This should be taken into
account when setting the current circuit supervision function.
Supervision functions
1315