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CHAPTER 7: MAINTENANCE
M3 BREAKER MAINTENANCE
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
7–11
Figure 8: BKR trip counter logic diagram
TO
T
A
L
=
LIMIT
OR
RUN
SETPOINT
Event
Recorder
T
ransient
Recorder
SETPO
IN
T
Operate
output
relays
upon
selection
OUTPUT
RELA
Y
4
OUTPUT
RELA
Y
5
OUTPUT
RELA
Y
6
OUTPUT
RELA
Y
3
T
rip
Counter
PKP
T
rip
Counter
Reset
T
rip
Counter
OP
Message
SETPOINT
TRIP
COUNTER
FUNC
Disabled
=
0
Latched
Alarm
Alarm
OR
OR
AND
T
rip
command
52a/b
contact
(Breaker
O
pen
)
IN
ITIAL
BKR
TRIPS
SETPOINT
Increment
Counter
TR
IP
COUNTER
LIMIT
BRK
TRIP
COUNTER
ACTUAL
VA
LU
ES
Breaker
Initial
trips
Counter
=
Initial
trips
+
new
trips
RST
BKR
TRIP
COUNT
SETPOINT
No
=
0
Ye
s
Set
to
Zero
AND
Counter
=
0
RESET
Command
AND
S
R
LA
TCH
898773.
cdr
LED:
ALARM