Triple Busbar Application With Bus Coupler And Bus Section - GE P741 Technical Manual

P74x/EN AP/Na7
(AP) 6-56
AP
The above example shows a triple busbar with both a bus section and a bus coupler.
bus section also has additional bus section isolators and allows for bus section bypass. The
scheme is split into six zones. There are n feeders connected to the busbar. The bus
coupler and bus section circuit breakers can have either a single CT (solution 1 and 2) on
one side or CTs on both sides (solution 1a or 2a). This configuration requires 1 central unit
and n plus the following number of peripheral units. The total number of peripheral units
required allows for a peripheral unit for the bus section isolators.
Solution
Solution 1
Solution 1a
Solution 2
Solution 2a
Number of
peripheral units
required
If a second bus coupler is added i.e. one bus coupler either side of the bus section
Using solution 1
for the 2
coupler
Using solution 1a
for the 2
coupler
Number of
peripheral units
required
The additional peripheral unit being for the bus section isolators is optional.
FIGURE 38: TRIPLE BUSBAR APPLICATION WITH BUS COUPLER
AND BUS SECTION
Solution A
1 CT on BC
& 1 CT on BS




n + 2

nd

nd
n + 3
TABLE 6: NUMBER OF REQUIRED PU'S FOR FIGURE 38
Solution B Solution C
2 CT on BC 1 CT on BC
& 2 CT on BS & 2 CT on BS
 
 
 
 
n + 4 n + 3
 
 
n + 6 n + 4
Application Notes
MiCOM P741, P742, P743
P3791ENa
The
Solution D
2 CT on BC
& 1 CT on BS




n + 3


n + 5