CM
5.2 Busbar Monitoring (only in CU)
The ‘BB monitoring’ cell is used to select the status of each zone. This cell has a binary
string with one bit per zone which can be set to ‘1’ to disable busbar protection and ‘0’ to
keep the zone in operating mode. When a zone is set to ‘1’, the current sum calculation
remains active for monitoring but a trip order cannot be generated by the busbar protection,
only from the breaker failure protection. Zones can be in busbar monitoring when others
zones remain active.
5.3 Busbar (BB) & Circuit Breaker Fail (CBF) Disable (only in CU)
The ‘BB & CBF disable’ cell is used to select the status of each zone. This cell has a binary
string with one bit per zone which can be set to ‘1’ to disable busbar & breaker failure
protection and ‘0’ to maintain the zone in operating mode. When a zone is set to ‘1’, the
current sum calculation remains active for monitoring but trip orders cannot be sent by either
the busbar protection or the breaker failure protection. Zones can be in ' BB & CBF disable '
when others zones remain active.
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