Chapter 6. Description of Operation of Protection Subsystem
6-43
M7IRDA2003I
7IRD-A/J/M: Distribution Protection & Control Terminal
© ZIV APLICACIONES Y TECNOLOGÍA, S.L.U. 2020
Trip and Close Outputs
The protection subsystem has two physical operate outputs, with two contacts, both normally
open. One of this outputs it’s assigned to the logic output called
Open
. This output is active
when the IED trip and when there is a open breaker manual operate and it’s active, in all cases,
by 100 ms minimum.
The second physical output it’s assigned to the
Close
logic output. This output is active when
the Recloser does a reclose command and when the breaker closes manually.
Breaker Operation
Manual trip and close operations can be performed through the terminal units using the same
Trip and Close Output contacts described above. These operations can be enabled using the
Operation Enable
setting (
Configuration
settings). Manual operation is designed to require
confirmation before trip or close commands are completed.
The terminal unit is designed to confirm that the breaker has changed state. A Breaker Open
and a Breaker Close Failure Time can be programmed for trip and close operations.
Open
Command Failure
or
Close Command Failure
alarms are generated if the breaker response
is too slow.
6.15.3
LED Targets
Each of the configurable LEDs is associated with a combinational logic function whose block
diagram is represented below in the following figure. The function is similar to the auxiliary
outputs, keeping in mind that, one of the two blocks has eight inputs and realizes an
OR
gate,
while the other has one input and can realize an
OR
or
AND
gate.
Figure 6.16 LED Target Output Logic Cell Block Diagram.
