GE MiCOM P40

5.12.6 THREE-PHASE FOLLOWER TIMING LOGIC DIAGRAM
V03348
CB1F3PAR
CB2F3PAR
3P Follower Time
&
&
&
&
CB1LFRC
En CB 1 Follower
CB2LFRC
AR Start
1
1
R
Q
S
CB13PFTCOMP
CB23PFTCOMP
1
Dynamic F/L
Enabled
&
3PF TComp
&
3PF TComp1
CB1F3PAR
CB2F3PAR
En CB 2 Follower
&
&
1
CB1FSPAR
CB2FSPAR
0
t
Follower Time
CB1 open 3 ph
CB2 open 3 ph
1
Figure 173: Three-phase Follower CB timing logic diagram (Module 29)
5.13
CIRCUIT BREAKER AUTOCLOSE
Autoclose logic takes effect when dead times have expired.
The Autoclose logic checks that all necessary conditions are satisfied before issuing an Autoclose command to the
circuit breaker control scheme.
Before a circuit breaker can be closed, it must be healthy (sufficient energy to close, and if necessary re-trip) and it
must not be in a lockout condition.
For three-phase Autoreclose, the circuit breaker must be open on all three phases and the appropriate system
check conditions must be met. For single-phase Autoreclose, the circuit breaker must be open on that phase.
The Autoclose command is a pulse lasting 100 milliseconds. Another command (Set CB Close) to set the circuit
breaker to close is asserted as well as the Autoclose command. This signal will remain set either until the end of
the Autoreclose cycle, or until the next protection operation. These commands are used to initiate the Reclaim
Time logic and the Autoreclose Shot Counter logic.
P446SV Chapter 11 - Autoreclose
P446SV-TM-EN-1 313