Protection-communication channels for lines

Protection-communication channels for lines:

Following number of independent channels shall be provided for protection of line (set-1 & set-

2 groups of channels shall be on separate communication routes):

 Lines at Both Ends per Line

a. Set-1 channels (on route-1):

• Channel(s) for set-1 Differential protection (87L-1)-No of channel will be increase depend on input current source of scheme

• Channel for set-1 Distance protection (21-1) send / receive

• Channel for set-1 DEF (67N-1) send / receive.

• Channel for BFP Direct Transfer Trip-1 send / receive.

• Channel for Pole-Discrepancy Transfer trip-1 send / receive.

b. Set-2 channels (on route-2):

• Channel(s) for set-1 Differential protection (87L-2)-No of channel will be increase depend on input current source of scheme

• Channel for set-2 Distance protection (21-2) send / receive.

• Channel for set-2 DEF (67N-2) send / receive.

• Channel for BFP Direct Transfer Trip-2 send / receive.

• Channel for Pole-Discrepancy Transfer trip-2 send / receive.