GE Multilin 345 - Page 235

CHAPTER 7: MAINTENANCE M3 BREAKER MAINTENANCE
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 7–9
Figure 7-6: W1 (W2) BKR trip counter logic diagram
897773A3.cdr
TOTAL ≥ LIMIT
RUN
SETPOINT
Event Recorder
Transient Recorder
W1 BKR Trip Count RST
W1 BKR Trip Count Alm OP
Message
SETPOINT
TRIP COUNTER FUNC Disabled = 0 Latched Alarm Alarm
OR
OR
AND
INITIAL BKR TRIPS
SETPOINT
Increment Counter
TRIP COUNTER LIMIT
BRK TRIP COUNTER
ACTUAL VALUES
Breaker Initial trips
Counter = Initial trips + new trips
RST W1 BKR TRIP COUNT
SETPOINT
No = 0 Yes
Set to Zero
AND
Counter = 0
LED: ALARM
RESET
Command
AND
S R
LATCH
AND
Trip W1 Breaker
52a/b contact (W1 Breaker Open)
0ms
t
DPO
= 100 ms
SETPOINT
Do Not Operate, Operate
OUTPUT RELAY X