x/EN AP/Na7
-34 MiCOM P74
P0875ENa
Bus Section Open
Isolator Closed
Isolator Closed
CB Closed
CB Closed
Check Zone = CT1 + CT2
Zone 1 = CT1
Zone 2 = CT2
Zone 1 = BB1
Zone 2 = BB2
FIGURE 15: BUS SECTION OPEN
A zone is defined from a CT to an other CT or an open electrical element (coupler CB or
isolator).
When the bus section is open, a zone is created from each bar feeder CT to that open bus
section.
There is one zone for BB1 and one zone for BB2.
6.5.2 Double bus with one CT bus coupler
P0876ENa
Coupling Closed
Isolator Closed
Isolator Closed
Zone 1 = CT1 + CT3
Zone 2 = CT2 + CT3
Zone 1 = BB1
Zone 2 = BB2
CB Closed CB Closed
Check Zone = CT1 + CT2
FIGURE 16: BUS COUPLER CLOSED
A zone is defined from a CT to an other CT or an open electrical element (coupler CB or
isolator).
When one CT is used in the coupling and the coupler CB is closed, a zone is created from
each bar feeder CT to that coupler CT.
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