Chapter 6. Description of Operation of Protection Subsystem
M7IRDA2003I
7IRD-A/J/M: Distribution Protection & Control Terminal
© ZIV APLICACIONES Y TECNOLOGÍA, S.L.U. 2020
6-18
Recloser Manual Close
If the
Recloser Manual Close Enable
setting is
YES
in the
Logic
Settings, then reclosing is
initiated when the Recloser receives a
Manual Close Command
signal from a Status Contact
Input. The subsequent closing sequence is similar to a final programmed reclose attempt except
there is no
Sequence Check Time
. Also, the following
Reclose Sequence
settings supersede
those associated with a final programmed reclose attempt:
-
Manual Close Supervision By Reference Voltage
(equivalent to Supervision of the
Reference Voltage Reclosing setting).
-
Time Delay on Reference Voltage.
-
Time Delay on Inhibit Input Deactivation.
-
Time Delay on Manual Close
(equivalent to Reclosing Time).
-
Reset Time after Manual Close.
Near the end of the
Recloser Manual Close
sequence, at breaker closure, the
Reset Time
after Manual Close
timer is started.
Recloser Lockout
results if a mask enabled trip output
occurs during this period of time. If no trip occurs, the Recloser returns to the
Recloser Reset
state.
6.6.4
Manual and External Blocking
There are two types of block signals,
Manual
and
External
. Priority is given to the block
commands received first. To remove the block the corresponding opposite command should be
issued.
Manual Blocking
The Recloser can be manually blocked with the
Recloser Block
command via the operator
interface keyboard
on the terminal unit. If the Recloser is in a
Reclose Sequence
when the
Block Reclosing
command is received, further operations are suspended. No reclose attempts
are initiated after a breaker trip.
A
Recloser Unblock
command must be entered from the operator interface to exit the Blocked
status. If the breaker is open when this command is received, the Recloser changes to the
Recloser Lockout
state. If the breaker is closed when the Unblock command is received, the
Reset Time after Manual Close
timer is started.
External Blocking
The
Recloser External Lockout
feature operates the same as
Block Reclosing
, except that
commands are executed through Status Contact Inputs instead of the operator interface.
The
Recloser External Lockout
state can be controlled by the status of one single status
contact input or by two separate contact inputs, depending on the model.
Block Reclosing
commands override
Recloser External Lockout
commands. If the Recloser
receives a
Recloser Block
command while in the
Recloser External Lockout
state, the
Recloser changes to the
Recloser Blocked
state which can only be reset by a
Recloser
Unblock
command.
