Alstom MiCOM P54 Series, Technical Manual, Page: 370 / 1024

P54x/EN OP/La4 Operation
(OP) 5-196
MiCOM P543, P544, P545 & P546
OP
5.6.6.12 Reclaim time & successful auto-reclose (P544/P546)
The reclaim time logic is shown in AR Figure 34 and Figure 35 (logic diagram supplement).
The successful auto-reclose logic is shown in AR Figure 36, Figure 37 and Figure 38
(logic diagram supplement).
The
Set CB1 Close
&
Set CB1 Close
, DDBs (1565/1449) signals from the auto close logic
are used to enable the reclaim timers. Depending on whether the circuit breaker has tripped
single phase or three phase, and whether single phase and/or three phase reclosing is
permitted for the circuit breaker, either the single phase reclaim timer
SPAR Reclaim Time
or the three phase reclaim timer
3PAR Reclaim Time
is enabled.
If any protection re-operates before the reclaim time has timed out, the sequence counter is
incremented. The counter signal advances from ‘Seq Counter = n’ to ‘Seq Counter = (n+1)’,
resets any ….
DTCOMP
signal and prepares the logic for the next dead time to start when
conditions are suitable. The operation also resets the
Set CB Close
signal, and hence the
reclaim timer is also stopped and reset. The
Reclaim time
starts again if the
Set CB Close
signal goes high following completion of a dead time in a subsequent auto-reclose cycle.
If CB1 is closed and has not tripped again when the reclaim time is complete, signals
CB1
Succ 1P AR
, (DDB1571) or
CB1 Succ 3P AR
, (DDB 852) are generated to indicate the
successful reclosure.
Similarly, If CB2 is reclosed during the auto-reclose cycle and remains closed when the
reclaim time is complete, signals
CB2 Succ 1P AR
, (DDB 1451) or
CB2 Succ 3P AR
, (DDB
1452) are generated to indicate successful reclosure.
These signals also increment the relevant circuit breaker successful auto-reclose shot
counters and reset the relevant
CB ARIP
signal.
The
successful auto-reclose
signals generated from the logic can be reset by various
commands and settings options available under CB CONTROL menu settings column.
These settings are described below:-
If
Res AROK by UI
is set to enabled, all the
successful auto-reclose
signals can be reset
by user interface command
Reset AROK Ind
from the CB CONTROL settings column.
If
Res AROK by NoAR
is set to enabled, the
successful auto-reclose
signals for each
circuit breaker can be reset by temporarily generating an
AR disabled
signal for each circuit
breaker according to the logic described in section 5.6.6.21,
Autoreclose Enable
logics, AR
Figure 5.
If
Res AROK by Ext
is set to enabled, the
successful autoreclose
signals for can be reset
by activation of the relevant input
Ext Rst CB1 AROK
or
Ext Rst CB2 AROK
(DDB1517 or
1417) mapped in the PSL.
If
Res AROK by TDly
is set to enabled, the
successful autoreclose
signals for are
automatically reset after a user defined time delay as set in
Res AROK by TDly
setting.
5.6.6.13 Circuit breaker healthy & system check timers (P544/P546)
The circuit breaker healthy and system check timers logic is shown in AR Figure 39 and
Figure 40 (logic diagram supplement).
This logic provides signals to cancel auto-reclosing for either circuit breaker if the circuit
breaker is not healthy (e.g. low gas pressure or, for three phase auto-reclosing, the required
line & bus voltage conditions are not satisfied) when the scheme is ready to close the circuit
breaker.
In this logic, both CB1 and CB2 share the settings
AR CBHealthy Time
and
AR CheckSync
Time
.