GE P24DM User Manual

healthy signal stays low, then, at the end of the Autoreclose healthy time, a circuit breaker unhealthy alarm is
raised. This forces the Autoreclose sequence to be cancelled.
Additionally, at the completion of any three-phase dead time, the logic starts an Autoreclose check synchronism
timer. If the circuit breaker synchronism-check OK signal goes high before the time is complete, the timer stops
and, if all other relevant circuit breaker closing conditions are satisfied, the scheme issues a circuit breaker
Autoclose signal. If the circuit breaker synchronism-check OK signal stays low, then when the Autoreclose check
synchronism timer expires, an alarm is set to inform that the check synchronism is not satisfied and cancels the
Autoreclose cycle.
5.14.1 CB HEALTHY AND SYSTEM CHECK TIMERS LOGIC DIAGRAM
V03363
RD
Q
S
1
&
0
t
OK Time 3P
CB1L3PAR
CB Fast SCOK
CB SCOK
CB1SPDTCOMP
CB13PDTCOMP
1
AR CB Unhealthy
CB Healthy Time
A/R Lockout
CB Closed 3 Ph
1
CB Healthy
CB13PDTCOMP
CB Closed 3 Ph
A/R Lockout
1
RD
Q
S
0
t
A/R No Checksync
Check Sync Time
1
If the DDB signal CB 1 Healthy is not mapped in PSL , it defaults to High.
Figure 196: Circuit Breaker Healthy and System Check Timers Healthy logic diagram (Module 39)
5.15
AUTORECLOSE SHOT COUNTERS
A number of counters are provided to enable analysis of circuit breaker Autoreclose history. The counters are
stored in non-volatile memory, so that the data is maintained even in the event of a failure of the auxiliary supply.
The counter values are accessible through the CB CONTROL column. The counters can be reset manually, or by
activation of an input appropriately mapped in the PSL.
The logic provides the following summary information for each circuit breaker
● Overall total number of shots (Number of Autoreclose attempts)
● Number of successful 1st shot single-phase Autoreclose sequences
● Number of successful 1st shot three-phase Autoreclose sequences
● Number of successful 2nd shot three-phase Autoreclose sequences
● Number of successful 3rd shot three-phase Autoreclose sequences
● Number of successful 4th shot three-phase Autoreclose sequences
● Number of failed Autoreclose cycles which forced a circuit breaker to lockout
Chapter 11 - Autoreclose P543i/P545i
336 P54x1i-TM-EN-1

GE P24DM Specifications

General

Brand	GE
Model	P24DM
Category	Control Unit
Language	English