Double Bus With One Ct Bus Coupler - GE P741 Technical Manual

P74x/EN AP/Na7
(AP) 6-34
A zone is defined from a CT to an other CT or an open electrical element (coupler CB or
AP
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

Zone 1 = CT1 + CT3
Zone 2 = CT2 + CT3
Zone 1 = BB1
Zone 2 = BB2
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.
Zone 1 = CT1
Zone 2 = CT2
Zone 1 = BB1
Zone 2 = BB2
FIGURE 15: BUS SECTION OPEN
FIGURE 16: BUS COUPLER CLOSED
Bus Section Open
Isolator Closed
CB Closed
Check Zone = CT1 + CT2
Coupling Closed
Isolator Closed
CB Closed
Check Zone = CT1 + CT2
Application Notes
MiCOM P741, P742, P743
Isolator Closed
CB Closed
P0875ENa
Isolator Closed
CB Closed
P0876ENa