Chapter 6. Description of Operation of Protection Subsystem
6-17
M7IRDA2003I
7IRD-A/J/M: Distribution Protection & Control Terminal
© ZIV APLICACIONES Y TECNOLOGÍA, S.L.U. 2020
Closing Time
When the Recloser Closing Time state is achieved, the
Reclose Command
(OR)
output is
activated to send a Close Command to the breaker and an adjustable
Breaker Close Failure
Timer
is started. If the breaker closes before the
Breaker Close Failure Time
is completed, the
Recloser
Reset Time
state is achieved. If the time is completed and the breaker remains open,
the Recloser state switches to
Recloser Lockout Due To Breaker Close Failure
. In either
case the
Reclose Command (OR)
output is subsequently de-activated.
Reset Time
When the Recloser
Reset Time
state is achieved, an adjustable
Reset Time
timer is started.
The
Reset Time
setting corresponds to the closing attempt the Recloser is currently executing
and the type of prior fault. If the
Reset Time
is completed without a trip being initiated, the
Recloser switches to the Recloser
Reset state
and the reclose attempt is completed
successfully.
If a trip occurs and Reclose Initiate (
IR
) is activated before the
Reset Time
is completed, the
next step in the reclose sequence is determined by the
Number of Reclose Attempts
setting.
If a trip (
IR
active) occurs after the last reclose attempt permitted by this setting, the Recloser
switches to
Recloser Lockout Due To Permanent Fault
, and the reclose sequence ends. If
the Recloser has not reached the last permitted reclose attempt, the trip (
IR
active) which
occurs before the
Reset Time
is completed initiates a new reclose attempt and the Recloser
switches to the
Sequence Check Time
state.
6.6.2
Recloser Lockout
The previous sections in this chapter have described how the
Recloser Lockout
state is
achieved where the Recloser cannot initiate a breaker closing attempt in response to fault
conditions and corresponding trip operations.
Another condition will produce
Recloser Lockout
.
Recloser Lockout
is also achieved when
the breaker is opened without a fault associated with the breaker operation. Under this
circumstance, the Recloser switches to
Recloser Lockout Due To Open Breaker Status
and
reclosing is disabled.
The Recloser will remain in the
Recloser Lockout
state until a closed breaker is detected or a
Manual Close Command
is initiated through the terminal unit. The Recloser will then reset only
if the breaker remains closed for the
Reset Time after Manual Close
set by the user.
6.6.3
Manual Close
There are two
Manual Close
operations that affect the status of the Recloser:
External Manual Close
External manual closing is identified when the Recloser detects, by way of the
Open Breaker
(IA)
Status Contact Input, that the breaker has closed and that a closing command has not been
issued by the terminal unit through the Recloser.
When this condition is detected, the Recloser leaves the
Recloser Lockout
state and switches
to the
Reset Time after Manual Close
state. When this state is achieved the timer for the
Reset Time after Manual Close
starts. If timing is completed without a trip initiation, the
Recloser switches to the
Recloser Reset
state. If there is a trip before timing is completed, the
Recloser switches to the
Recloser Lockout Due To Switch-On-To-Fault
state.
