scheider electric MiCOM P746, Technical Manual

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Application Notes P746/EN AP/G31
MiCOM P746 (AP) 6-
49
FIGURE 24: BREAKER AND A HALF SCHEME
The above example shows a breaker and a half scheme.
There are 3 feeders connected to each busbar. This configuration requires 1 P746
AP
If it was up to 12 feeders connected to the busbars, the scheme would require 2 sets of 1
P746 or 3 P746.
If it was up to 18 feeders connected to the busbars, the scheme would require 3 P746.
If it was up to 36 feeders connected to the busbars. Each scheme would require 3 P746.
The type of P746 used will depend on the i/o requirements of the scheme in question.
FIGURE 25: DOUBLE BUSBAR APPLICATION WITH BUS COUPLER
The above example shows a double busbar with a bus coupler. It is split into two zones.
If there is a bus coupler with a single CT (solution 1) and up to 5 feeders connected to the
busbar. This configuration requires 1 P746
If there is a bus coupler with CTs on both sides (solution 2) and 4 feeders connected to the
busbar. This configuration requires 1 P746
If there is a bus coupler with a single CT (solution 1) and up to 17 feeders connected to the
busbar. This configuration requires 3 P746
If there is a bus coupler with CTs on both sides (solution 2) and 16 feeders connected to the
busbar. This configuration requires 3 P746