7–10
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
M3 BREAKER MAINTENANCE
CHAPTER 7: MAINTENANCE
Figure 7-9: BKR trip counter logic diagram
898773A3.cdr
TO
TA
L
≥
LIMIT
AND
RUN
SETPOINT
Event Recorder
Transient Recorder
T
rip Counter Reset
T
rip Counter OP
Message
SETPOINT
TRIP
COUNTER FUNC
Disabled
=
0
Latched
Alarm
Alarm
OR
OR
AND
T
rip command
52
a
/b contact
(Breaker Open
)
INITIAL
BKR
TRIPS
SETPOINT
Increment Counter
TRIP
COUNTER LIMIT
BRK
TRIP
COUNTER
ACTUAL
V
ALUES
Breaker Initial trips
Counter
=
Initial trips
+
new trips
RST
BKR
TRIP
COUNT
SETPOINT
No
=
0
Ye
s
Set to Zero
AND
Counter
=
0
LED
:ALARM
RESET
Command
AND
S
R
LA
TCH
0m
s
t
DP
O
=
100
ms
SETPOINT
Do Not Operate, Operate
OUTPUT
RELA
Y X