Cb Lockout Logic Diagram; Figure 85: Ar Lockout Logic Diagram (Module 55) - GE P4A Technical Manual

Chapter 7 - Autoreclose
Circuit breaker failure to close. If a circuit breaker fails to close Autoreclose is blocked and forced to lockout.
●
Circuit breaker remains open at the end of the reclaim time. An Autoreclose lockout is forced if the circuit
●
breaker is open at the end of the reclaim time.
● Circuit breaker fails to close when the close command is issued.
Circuit breaker fails to trip correctly.
●
Three-phase dead time started by 'line dead' violation. If the line does not go dead within the Dead Line
●
Time setting, the logic forces the Autoreclose sequence to lockout. Determination of when to start the timer
is made in the 3PDTStart WhenLD setting.
Multi-phase faults. The logic can be set to block Autoreclose either for two-phase or three-phase faults, or
●
to block Autoreclose for three-phase faults only. For this, the setting Multi Phase AR in the AUTORECLOSE
column applies.
Single-phase evolving into multi-phase fault. A discriminating time (Discrim Time in the AUTORECLOSE
●
settings) is provided for this feature If, after expiry of the discriminating time, a single-phase fault evolves
into a two-phase or three-phase fault, the internal signal 'Evolve Lock' is asserted and the Autoreclose is
forced to lockout.
5.18.1

CB LOCKOUT LOGIC DIAGRAM

FLTMEM3P
Multi Phase AR
BAR 3 Phase
BAR 2 and 3 Ph
FLTMEM2P
CB Close Fail
CB Fail Pr Trip
CB1OpAny
CB ARIP
Block CB AR
A/R CB Unhealthy
A/R No Checksync
Evolve 3Ph
PROTRE-OP
LastShot
CB ARIP
EVOLVELOCK
ProtARBlock
CB In Service
TMEM2 /3Ph
CB1L3 PAROK
CB In Service
TMEM1Ph
CB1 LSPAROK
Seq Counter >Set
CB1 Status Alm
DeadLineLockout
V03379

Figure 85: AR Lockout Logic Diagram (Module 55)

170
&
1
&
&
S
Q
R
&
&
&
0
0.02s
&
0
0.02s
AR In Service
RESCB1LO
1
P54A/B/C/E
A/ R Lockout
&
S
Q
R
&
BARCB1
P54xMED-TM-EN-1