Apart from the continued protection communication, the communication channel can
also be used for binary signal transfer (BST) that is, transferring of user configurable
binary information between the relays. There are a total of eight BST signals available
for user definable purposes. The BST signals can originate from the relay’s binary
inputs or internal logics, and be assigned to the remote relay’s binary outputs or
internal logics.
The protection communication supervision continuously monitors the protection
communication link. The relay immediately blocks the line differential protection
function in case that severe interference in the communication link, risking the correct
operation of the function, is detected. An alarm signal will eventually be issued if the
interference, indicating permanent failure in the protection communication, persists.
The two high-set stages of the overcurrent protection are further by default released.
RED615 RED615
Fibre-optic line differential
communication link
Protection communication and supervision
Binary signal transfer
GUID-8CE71CC9-F0EA-4BE9-B693-173CAEA9FA58 V2 EN
Figure 11: Fiber optic protection communication link
Section 2 1MRS758127 C
RED615 overview
30 RED615
Application Manual
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