GE P24DM - Circuit Breaker Fail Logic; Figure 90: Circuit Breaker Fail Logic - Three Phase Start

4 CIRCUIT BREAKER FAIL LOGIC
V00634
Ext. Trip 3phExt. Trip 3ph
Trip Command InTrip Command In
IA< StartIA< Start
IB< StartIB< Start
IC< StartIC< Start
External Trip EFExternal Trip EF
IN< StartIN< Start
External TripSEFExternal TripSEF
CBF SEF Trip
ISEF< StartISEF< Start
CBF NonI Trip
Volt Prot ResetVolt Prot Reset
I< OnlyI< Only
CB Open & I<CB Open & I<
Prot Reset & I<Prot Reset & I<
All Poles DeadAll Poles Dead
Ext. Trip 3phExt. Trip 3ph
Ext Prot ResetExt Prot Reset
I< OnlyI< Only
CB Open & I<CB Open & I<
Prot Reset & I<Prot Reset & I<
All Poles DeadAll Poles Dead
ZCD IA<
ZCD IC<
ZCD IB<
ZCD IN<
ZCD IN<
ZCD ISEF<
CBF3PhStart
CB Fail AlarmCB Fail Alarm
1
&
&
1
1
IN< StartIN< Start
1
1
1
1
&
&
1
&
&
S
RD
Q
S
RD
Q
S
RD
Q
S
RD
Q
S
RD
Q
S
RD
Q
S
R
D
Q
S
R
D
Q
S
R
D
Q
S
R
D
Q
S
R
D
Q
S
R
D
Q
S
RD
Q
S
RD
Q
S
RD
Q
Note on SR Latches
All latches are reset dominant and are triggered on the positive edge. If
the edge occurs while the reset is active, the detection of the edge is
delayed until the reset becomes non -active.
Figure 90: Circuit Breaker Fail logic - three phase start
P24xM Chapter 8 - CB Fail Protection
P24xM-TM-EN-2.1 183