Table of Contents
P54A/B/C/E
4.3
CIRCUIT BREAKER FAIL LOGIC - PART 3
WIINFEEDA
TripStateExtA
ExtTrip Only Ini
Enabled
AnyTripPhaseA
IA
External Trip 3Ph
All Poles Dead
Pole Dead A
&
Pole Dead B
Pole Dead C
IA
![loading]()
&
IB
IC
ExtTrip Only Ini
Enabled
CBF Non I Trip
All Poles Dead
Pole Dead A
&
Pole Dead B
Pole Dead C
IA
&
IB
IC
Logic 0
V00731
Figure 95: Circuit Breaker Fail logic - part 3
P54xMED-TM-EN-1
&
S
Q
R
D
1
1
&
&
0
&
1
&
&
1
S
4
Q
1
R
D
3
Ext Prot Reset
2
I< Only
&
CB Open & I<
1
Prot Reset & I<
Prot Reset OR I <
0
Rst OR CBOp & I<
4
3
2
&
1
0
S
2
Q
&
R
D
1
Ext Prot Reset
0
I< Only
CB Open & I<
Prot Reset & I<
Prot Reset OR I <
Rst OR CBOp & I<
2
&
1
0
Chapter 8 - CB Fail Protection
TripStateA
1
Latch3PhTripResetIncomp
LatchNonITripResetIncomp
189
Table of Contents
Troubleshooting
