GE MiCOM P141 Agile - Figure 103: Circuit Breaker Fail Logic - Single Phase Start

V00657
External Trip A
IA< Start
Ext Prot Reset
I< Only
CB Open & I<
Prot Reset & I<
Pole Dead A
External Trip A
ZCD IA<
CBFExtPhAStart
CBFExtPhBStart
CBFExtPhCStart
CB Fail Alarm
1
&
S
RD
Q
S
R
D
Q
1
1
&
&
External Trip B
IB< Start
Ext Prot Reset
I< Only
CB Open & I<
Prot Reset & I<
Pole Dead B
External Trip B
ZCD IB<
CB Fail Alarm
1
&
S
R
D
Q
S
RD
Q
1
1
&
&
External Trip C
IC< Start
Ext Prot Reset
I< Only
CB Open & I<
Prot Reset & I<
Pole Dead C
External Trip C
ZCD IC<
CB Fail Alarm
1
&
S
RD
Q
S
R
D
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 103: Circuit Breaker Fail logic - single phase start
Chapter 8 - CB Fail Protection P14x
188 P14xEd1-TM-EN-1