Operation P54x/EN OP/La4
MiCOM P543, P544, P545 & P546
(OP) 5-199
OP
Manual reclosing for each circuit breaker is controlled according to the settings in the
SYSTEM CHECKS column of the menu. The system check options for each circuit breaker
are enabled or disabled in the CBxM SC all setting (x = 1 or 2) in the SYSTEM CHECKS
column of the menu. If set to Disabled, then no system checks are required for manual
closure, and the relevant settings are invisible. Otherwise, the system check options that
can be enabled for each breaker (as leader or follower) are :-
System check option Setting
Check synchronism stage 1
(refer note 1 above)
CBxM SC CS1
Check synchronism stage 2
(refer note 1 above)
CBxM SC CS2
Dead line / Live Bus
CBxM SC DLLB
Live Line / Dead bus
CBxM SC LLDB
Dead line / Dead bus
CBxM SC DLDB
5.6.6.16 CB1 & CB2 trip time monitor (P544/P546)
The circuit breaker trip time monitor logic is shown in AR Figure 53 and Figure 54 (logic
diag
ram supplement).
This logic checks that a circuit breaker trips correctly following the issuing of a protection trip
signal.
When any protection trip signal is issued a timer, Trip Pulse Time is started.
The Trip Pulse Time setting is common to both CB1 and CB2 and is used in the trip time
monitor logic and in the circuit breaker control logic.
If the circuit breaker trips correctly (single phase or three phase, according to the trip signal
and settings) the timer resets and the auto-reclose cycle, if enabled, proceeds normally. If
either circuit breaker fails to trip correctly within the set time, the signal CB1 Fail Pr Trip
(1575) and/or CB2 Fail Pr Trip (1459) is issued and the affected circuit breaker auto-reclose
cycle is forced to lock out.
5.6.6.17 Autoreclose lockout (P5
44/P546)
The auto-reclose lockout logic is shown in AR Figure 55, Figure 55a, Figure 56, and
Figure 56a (l
ogic diagram supplement).
Auto-reclose lockout of a circuit breaker will be triggered by a number of events. These are
outlined below:-
Protection operation during reclaim time. If, following the final reclose attempt, the
protection operates during the reclaim time, the relay will be driven to lockout and the
auto-reclose function will be disabled until the lockout condition is reset.
Persistent fault. A fault is considered persistent if the protection re-operates after the
last permitted shot.
Block auto-reclose. The block auto-reclose logic can cause a lockout if auto-reclose is in
progress. If asserted, the Block CBx AR input (DDB 448 /1421) mapped in the PSL will,
if auto-reclose is in progress, block auto-reclose and cause a lockout.
Multi phase faults. The logic can be set to block auto-reclose either for two phase or
three phase faults, or to block auto-reclose for three phase faults only. For this, the
setting Multi Phase AR applies, where the options are Allow AR, BAR 2&3 Phase &
BAR 3 Phase in the AUTORECLOSE column of the menu.
Protection function selection. The protection functions can be individually selected to
block auto-reclose and force lockout. If enabled, the protection functions in the
AUTORECLOSE column of the menu can be set to Block AR. Selecting Block AR will
cause a lockout if the particular protection function operates.
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