Rockwell Automation 865 Differential Protection Relay - Manual (Page 123)

Control Functions 6-5
865-UM001A-EN-P – July 2009
Blocking Matrix By means of a blocking matrix, the operation of any protection stage
can be blocked. The blocking signal can originate from the digital
inputs DI1 to DI6, or it can be a start or trip signal from a protection
stage or an output signal from the user's programmable logic. In the
block matrix Figure 6.2 an active blocking is indicated with a black
dot (•) in the crossing point of a blocking signal and the signal to be
blocked.
Figure 6.2 – Blocking Matrix and Output Matrix
Controllable Objects The relay allows controlling of six objects, that is, circuit-breakers,
disconnectors and earthing switches. Controlling can be done by
"select-execute" or "direct control" principle.
The logic functions can be used to configure interlocking for a safe
controlling before the output pulse is issued. The objects 1...6 are
controllable while the objects 7...8 are only able to show the status.
Controlling is possible by the following ways:
through the local HMI
through a remote communication
through a digital input.
The connection of an object to specific output relays is done via an
output matrix (object 1-6 open output, object 1-65 close output).
There is also an output signal “Object failed”, which is activated if
the control of an object fails.