Technical Guide P92x/EN FT/E11
User Guide
MiCOM P921-P922-P923 Page 83/110
11.10 "CB SUPERVISION" Menu
11.10.1 Description
This sub-menu makes it possible to validate the circuit breaker supervision and
monitoring functions, and the various settings associated to these functions.
In the MiCOM P921 – P922 and P923 relays, the control of the circuit breaker can be
done :
· Tripping order : the tripping order is realized by using the dedicated trip output
contact (RL1). This command is maintained during the specified “TRIP PULSE
TIME”. The command can be generated by a protective function of the relay : it
can also be done via a logic input (select the “AUX1” logic input and assign the
"tAUX1" to the trip output relay), or via the local/remote communication (see
chapter 6 of this Technical Guide),
· Closing order : 2 different ways can be used.
- This order is realized by using the output contact, which has
been configured for this closing order (see "AUX OUTPUT
RLY" menu, "CLOS. CB" cell). This command is maintained
during the specified "CLOSE PULSE TIME". The command can
only be generated via the local/remote communication (see
chapter 6 of this Technical Guide).
- This order can also be realized by using one logic input
(select the "AUX2 logic input) which can be assigned to any
of the output contacts. This command will be maintained as
long as the logic input is energized.
Moreover, the MiCOM P922-P923 relays offer the supervision of the closing/opening
time of the circuit breaker. They also include the supervision of the number of CB
operations, with a settable threshold of the maximum allowed operations.
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