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P746/EN AP/G31 Application Notes
(AP) 6-
36
MiCOM P746
AP
8. UNDERTAKING A NUMERICAL DIFFERENTIAL BUSBAR PROTECTION
PROJECT
This light Engineering can be done by anyone
The substation construction will influence the protection scheme installed. It is advisable that
a scheme evaluation is conducted as soon as possible, preferably at the same time as the
definition of the equipment specification.
8.1 One or Three box mode selection
A P746 embeds 18 current inputs and can be connected to 6 three phase CTs or 18 single
phase CTs.
A P746 embeds 3 voltage inputs.
P746 mode selection
Single bus or radial bus with no CT coupling (1 zone)
Set of CTs Up to 6 Up to 18
Set of VTs 0 or 1 0 or 1
Mode One box mode 3 boxes mode
Radial bus with 1 or 2 CT coupling (2 zones)
Set of CTs Up to 6 Up to 12 Up to 18 Up to 36
Set of VTs 0 or 1 0 to 2 0 or 2 0 to 2
Mode One box mode One box
mode 3 boxes mode 3 boxes
mode
Note 2 sets of 2 sets of
Double bus with no transfer bus (2 zones)
Set of CTs Up to 6 Up to 6 Up to 18 Up to 18
Set of VTs 0 or 1 0 to 2 0 or 1 0 or 2
Mode One box mode 3 boxes
mode
3 boxes mode 3 boxes
mode
One & half breaker (2 zones)
Set of CTs Up to 6 Up to 6 Up to 12 Up to 18 Up to 18 Up to 36
Set of VTs 0 or 1 2 0 to 1 0 or 1 0 or 2 0 to 2
Mode One box mode 3 boxes
mode
One box
mode 3 boxes mode 3 boxes
mode 3 boxes
mode
Note 2 sets of 1 sets of 2 sets of
Double bus with transfer bus or Triple bus (3 zones)
NOT POSSIBLE
Three buses (3 zones) or Four buses (4 zones), etc…
POSSIBLE if can be split in simpler bus topology.