Alstom MiCOM P545 - 5.6.3 Internal signals (P544;P546); 5.6.3.1 Trip initiate signals (P544;P546); 5.6.3.2 Circuit breaker status (P544;P546); 5.6.3.3 Check synch ok and system check ok (P544;P546)

P54x/EN OP/La4 Operation
(OP) 5-184 MiCOM P543, P544, P545 & P546
OP
5.6.3 Internal signals (P544/P546)
5.6.3.1 Trip initiate signals (P544/P546)
The Trip Inputs A, Trip I
nputs B and Trip Inputs C signals are used to initiate single or
three phase auto-reclose.
Note: For single phase auto-reclose these signals must be mapped in the
PSL as shown in the default.
5.6.3.2 Circuit breaker status (P544/P546)
The CB
Open 3 ph, CB Open A ph, CB Open B ph and CB Open C ph, signals are used
to indicate if a circuit breaker is open three or single phase. These are driven from the
internal pole dead logic and the circuit breaker auxiliary inputs.
The CB Closed 3 ph, CB Closed A ph, CB Closed B ph and CB Closed C ph, signals are
used to indicate if a circuit breaker is closed three or single phase. These are driven from
the internal pole dead logic and the circuit breaker auxiliary inputs.
5.6.3.3 Check synch ok and system check ok (P544/P546)
Internal
signals generated from the internal system check function and external system
check equipment are used by the internal auto-reclose logic to permit auto-reclosure.
DDB (883) CB1 CS1 OK & DDB (884) CB1 CS2 OK are output from CB1 Check Sync logic
and indicate conditions for CB1 sync check stage1 & 2 are satisfied.
DDB (1577) CB2 CS1 OK & DDB (1463) CB2 CS2 OK are output from CB2 Check Sync
logic and indicate conditions for CB2 sync check stage1 & 2 are satisfied.
5.6.4 Auto-reclose logic outputs (P544/P546)
The CB1
AR 1p InProg (DDB 845) and the CB2 AR 1p InProg (DDB 855) output signals
indicate that single phase auto-reclose is in progress. The outputs remain high from
protection initiation until lockout, or successful reclosure of the circuit breaker which is
indicated by the circuit breaker successful auto-reclose signals,CB1 Succ 1P AR (DDB
1571) and CB2 Succ 1P AR (DDB 1451) generated by the logic for CB1 and CB2
respectively.
The CB1 AR 3p InProg (DDB 844) and CB2 AR 3p InProg (DDB 1411) output signals
indicate that three phase auto-reclose is in progress. The outputs remain high from
protection initiation until lockout, or successful reclosure of the circuit breaker which is
indicated by the circuit breaker successful auto-reclose signals, CB1 Succ 3P AR (DDB
852) and CB2 Succ 3P AR (DDB 1452) for generated by the logic for CB1 and CB2
respectively.
Any auto-reclose lockout condition will reset all auto-reclose in progress signals associated
with that circuit breaker (e.g. “ARIP”).
5.6.5 Auto-reclose logic operating sequence (P544/P546)
For
simplicity, the auto-reclose operating sequence is described for the case of a single
circuit breaker, CB1 only.
The same operating sequence would apply if CB2 only was enabled.
In a dual breaker application, the same operating sequence would apply to the leader circuit
breaker and, provided the leader circuit breaker remained closed after the set dead time, the
follower circuit breaker would reclose after a further delay (the follower time).
Note: In a dual circuit breaker application, the settings describing single and
three phase auto-reclose AR 1P AR 3P and AR 1/3P below would
change in the dual breaker case to reflect the mode of the leader
circuit breaker L1P, L3P, L1/3P.