GE P24DM - Figure 91: Circuit Breaker Fail Logic - Single Phase Start; Figure 92: Circuit Breaker Fail Trip and Alarm

V00657
External Trip AExternal Trip A
IA< StartIA< Start
Ext Prot ResetExt Prot Reset
I< OnlyI< Only
CB Open & I<CB Open & I<
Prot Reset & I<Prot Reset & I<
Pole Dead APole Dead A
External Trip AExternal Trip A
ZCD IA<
CBFExtPhAStart
CBFExtPhBStart
CBFExtPhCStart
CB Fail AlarmCB Fail Alarm
1
&
S
R
D
Q
S
R
D
Q
S
R
D
Q
S
RD
Q
S
RD
Q
S
RD
Q
1
1
&
&
External Trip BExternal Trip B
IB< StartIB< Start
Ext Prot ResetExt Prot Reset
I< OnlyI< Only
CB Open & I<CB Open & I<
Prot Reset & I<Prot Reset & I<
Pole Dead BPole Dead B
External Trip BExternal Trip B
ZCD IB<
CB Fail AlarmCB Fail Alarm
1
&
S
RD
Q
S
RD
Q
S
RD
Q
S
R
D
Q
S
R
D
Q
S
R
D
Q
1
1
&
&
External Trip CExternal Trip C
IC< StartIC< Start
Ext Prot ResetExt Prot Reset
I< OnlyI< Only
CB Open & I<CB Open & I<
Prot Reset & I<Prot Reset & I<
Pole Dead CPole Dead C
External Trip CExternal Trip C
ZCD IC<
CB Fail AlarmCB Fail Alarm
1
&
S
R
D
Q
S
R
D
Q
S
R
D
Q
S
RD
Q
S
RD
Q
S
RD
Q
1
1
&
&
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 91: Circuit Breaker Fail logic - single phase start
V00676
CB Fail 1 Status
Bfail1 Trip 3ph
Bfail2 Trip 3ph
CB Fail Alarm
Enabled
CBFExtPhAStart
CBFExtPhBStart
CBFExtPhCStart
CBF3PhStart &
1
1&
&
1
1
1
CB Fail 2 Status
Enabled
CBFExtPhAStart
CBFExtPhBStart
CBFExtPhCStart
CBF3PhStart
&
1
&
&
1
1
1
Figure 92: Circuit Breaker Fail Trip and Alarm
Chapter 8 - CB Fail Protection P24xM
184 P24xM-TM-EN-2.1