CHAPTER 7: MAINTENANCE
M3 BREAKER MAINTENANCE
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
7–5
Figure 7-5: Trip coil monitoring logic diagram
SETPOINT
TRIP
COIL
FUNCTION:
Disabled = 0
Latched
Alarm
Event Recorder
Transient Recorder
Alarm
OR
OR
AND
SETPOINT
Do Not Operate, Operate
OUTPUT
RELA
Y X
T
rip Coil Montr OP
Message
T
rip Coil current above
threshold
AND
OR
52a/b INPUTS
Breaker Closed
T
rip
From output relay 1 TRIP
SETPOINT
BYP
ASS BKR ST
AT
E
Enabled = 1
Disable = 0
AND
TRIP
COIL
DELA
Y:
SETPOINT
t
PKP
LED:
MAINTENANCE
T
rip Coil Montr PKP
Message
LED:
ALARM
RESET
Command
AND
S
R
LA
TCH
898020A1.cdr