Circuit Breaker Fail Logic; Figure 87: Circuit Breaker Fail Logic - Three Phase Start - GE MiCOM P40 Agile Technical Manual

P14D
4

CIRCUIT BREAKER FAIL LOGIC

Ext. Trip 3ph
Trip Command In
IA< Start
IB< Start
IC< Start
IN< Start
ZCD IA<
ZCD IB<
ZCD IC<
ZCD IN<
CB Fail Alarm
External Trip EF
IN< Start
ZCD IN<
External TripSEF
CBF SEF Trip
ISEF< Start
ZCD ISEF<
CBF NonI Trip
Volt Prot Reset
Prot Reset & I<
I< Only
CB Open & I<
All Poles Dead
Ext. Trip 3ph
Ext Prot Reset
Prot Reset & I<
CB Open & I<
All Poles Dead

Figure 87: Circuit Breaker Fail logic - three phase start

P14D-TM-EN-8
1
&
1
&
1
1
1
&
1
&
&
1
I<Only
&
S
Q
R
D
1
S
Q
R
D
S
Q
R
D
S
Q
R
D
S
Q
R
D
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.
Chapter 8 - CB Fail Protection
CBF3PhStart
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